diff --git a/racket/src/racket/dynsrc/mkmzdyn.bat b/racket/src/racket/dynsrc/mkmzdyn.bat
index ca549f5148..e9f31e44dc 100644
--- a/racket/src/racket/dynsrc/mkmzdyn.bat
+++ b/racket/src/racket/dynsrc/mkmzdyn.bat
@@ -1,6 +1,19 @@
-cl /MT -O2 -I../include -I../../worksp /c mzdyn.c
-lib -machine:X86 -def:mzdyn.def -out:mzdyn.lib
-mkdir ..\..\..\lib
-mkdir ..\..\..\lib\msvc
-copy mzdyn.exp ..\..\..\lib\msvc
-copy mzdyn.obj ..\..\..\lib\msvc
+set BUILD_CONFIG=%1
+
+if "%BUILD_CONFIG%"=="SDebug" goto asdebug
+if "%BUILD_CONFIG%"=="BDebug" goto asdebug
+
+cl /MT -O2 -I../include -I../../worksp /c mzdyn.c
+goto finish
+
+:asdebug
+cl /Od /D"_DEBUG" /RTC1 /MTd /GS /W3 -I../include -I../../worksp /c mzdyn.c
+
+:finish
+
+lib -def:mzdyn.def -out:mzdyn.lib
+
+mkdir ..\..\..\lib
+mkdir ..\..\..\lib\msvc
+copy mzdyn.exp ..\..\..\lib\msvc
+copy mzdyn.obj ..\..\..\lib\msvc
diff --git a/racket/src/racket/dynsrc/mkmzdynd.bat b/racket/src/racket/dynsrc/mkmzdynd.bat
deleted file mode 100644
index c779027948..0000000000
--- a/racket/src/racket/dynsrc/mkmzdynd.bat
+++ /dev/null
@@ -1,7 +0,0 @@
-@REM   Debug version of mkmzdyn
-cl /Od /D"_DEBUG" /RTC1 /MTd /GS /W3 -I../include -I../../worksp /c mzdyn.c
-lib -machine:X86 -def:mzdyn.def -out:mzdyn.lib
-mkdir ..\..\..\lib
-mkdir ..\..\..\lib\msvc
-copy mzdyn.exp ..\..\..\lib\msvc
-copy mzdyn.obj ..\..\..\lib\msvc
diff --git a/racket/src/worksp/README b/racket/src/worksp/README
index ea7379c052..aa6bac84c5 100644
--- a/racket/src/worksp/README
+++ b/racket/src/worksp/README
@@ -86,13 +86,13 @@ version 9.0).
 To build RacketCGC, build the Racket solution in
   racket\src\worksp\racket - makes racket\RacketCGC.exe
 
-  [When you open the solution, it may default to "Debug"
-   configuration.  Switch to "Release" before building.]
+  [When you open the solution, switch to a "Release" configuration
+   before building.]
 
 To build GRacketCGC, build the GRacket solution:
   racket\src\worksp\gracket - makes racket\GRacketCGC.exe
 
-  [Again, switch to the "Release" configuration if necessary.]
+  [Again, switch to a "Release" configuration if necessary.]
 
 The build processes for RacketCGC and GRacketCGC automatically builds
   libmzgc    - makes racket\lib\libmzgcxxxxxxx.dll and
@@ -271,3 +271,16 @@ libraries to embed Racket in an application.
 If you need Racket to link to a DLL-based C library (instead of
 statically linking to the C library within the Racket DLL), then compile
 Racket with the /MD flag.
+
+----------------------------
+SenoraGC versus the Boehm GC
+----------------------------
+
+The "Release" and "Debug" solution configurations use SenoraGC (SGC),
+while the "AltGCRelease" and "AltGCDebug" configurations use the
+variant of the Boehm GC that is included with Racket.
+
+In project files, "SRelease" and "SDebug" (as used by the "Release"
+and "Debug" solution configurations) build against SGC, while
+"BRelease" and "BDebug" (as used by the "AltGCRelease" and
+"AltGCDebug" solution configurations) build against the Boehm GC.
diff --git a/racket/src/worksp/gracket/gracket.sln b/racket/src/worksp/gracket/gracket.sln
index ce705c8995..729ac7236b 100644
--- a/racket/src/worksp/gracket/gracket.sln
+++ b/racket/src/worksp/gracket/gracket.sln
@@ -16,44 +16,56 @@ Global
 		Debug|x64 = Debug|x64
 		Release|Win32 = Release|Win32
 		Release|x64 = Release|x64
-		SGC|Win32 = SGC|Win32
-		SGC|x64 = SGC|x64
+		AltGCDebug|Win32 = AltGCDebug|Win32
+		AltGCDebug|x64 = AltGCDebug|x64
+		AltGCRelease|Win32 = AltGCRelease|Win32
+		AltGCRelease|x64 = AltGCRelease|x64
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Debug|Win32.ActiveCfg = Debug|Win32
-		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Debug|Win32.Build.0 = Debug|Win32
-		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Debug|x64.ActiveCfg = Debug|x64
-		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Debug|x64.Build.0 = Debug|x64
-		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Release|Win32.ActiveCfg = Release|Win32
-		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Release|Win32.Build.0 = Release|Win32
-		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Release|x64.ActiveCfg = Release|x64
-		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Release|x64.Build.0 = Release|x64
-		{D59A2B28-330B-41F5-8261-F5BC1019E163}.SGC|Win32.ActiveCfg = SGC|Win32
-		{D59A2B28-330B-41F5-8261-F5BC1019E163}.SGC|Win32.Build.0 = SGC|Win32
-		{D59A2B28-330B-41F5-8261-F5BC1019E163}.SGC|x64.ActiveCfg = SGC|x64
-		{D59A2B28-330B-41F5-8261-F5BC1019E163}.SGC|x64.Build.0 = SGC|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|Win32.ActiveCfg = Debug|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|Win32.Build.0 = Debug|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|x64.ActiveCfg = Debug|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|x64.Build.0 = Debug|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|Win32.ActiveCfg = Release|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|Win32.Build.0 = Release|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|x64.ActiveCfg = Release|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|x64.Build.0 = Release|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.SGC|Win32.ActiveCfg = SGC|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.SGC|Win32.Build.0 = SGC|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.SGC|x64.ActiveCfg = SGC|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.SGC|x64.Build.0 = SGC|x64
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Debug|Win32.ActiveCfg = SDebug|Win32
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Debug|Win32.Build.0 = SDebug|Win32
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Debug|x64.ActiveCfg = SDebug|x64
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Debug|x64.Build.0 = SDebug|x64
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Release|Win32.ActiveCfg = SRelease|Win32
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Release|Win32.Build.0 = SRelease|Win32
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Release|x64.ActiveCfg = SRelease|x64
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Release|x64.Build.0 = SRelease|x64
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.AltGCDebug|Win32.ActiveCfg = BDebug|Win32
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.AltGCDebug|Win32.Build.0 = BDebug|Win32
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.AltGCDebug|x64.ActiveCfg = BDebug|x64
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.AltGCDebug|x64.Build.0 = BDebug|x64
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.AltGCRelease|Win32.ActiveCfg = BRelease|Win32
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.AltGCRelease|Win32.Build.0 = BRelease|Win32
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.AltGCRelease|x64.ActiveCfg = BRelease|x64
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.AltGCRelease|x64.Build.0 = BRelease|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|Win32.ActiveCfg = SDebug|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|Win32.Build.0 = SDebug|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|x64.ActiveCfg = SDebug|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|x64.Build.0 = SDebug|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|Win32.ActiveCfg = SRelease|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|Win32.Build.0 = SRelease|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|x64.ActiveCfg = SRelease|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|x64.Build.0 = SRelease|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCDebug|Win32.ActiveCfg = BDebug|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCDebug|Win32.Build.0 = BDebug|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCDebug|x64.ActiveCfg = BDebug|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCDebug|x64.Build.0 = BDebug|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCRelease|Win32.ActiveCfg = BRelease|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCRelease|Win32.Build.0 = BRelease|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCRelease|x64.ActiveCfg = BRelease|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCRelease|x64.Build.0 = BRelease|x64
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|Win32.ActiveCfg = Debug|Win32
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|Win32.Build.0 = Debug|Win32
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|x64.ActiveCfg = Debug|x64
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|x64.Build.0 = Debug|x64
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|Win32.ActiveCfg = Release|Win32
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|Win32.Build.0 = Release|Win32
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|x64.ActiveCfg = Release|x64
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|x64.Build.0 = Release|x64
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.SGC|Win32.ActiveCfg = SGC|Win32
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.SGC|x64.ActiveCfg = SGC|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|Win32.ActiveCfg = Debug|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|Win32.Build.0 = Debug|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|x64.ActiveCfg = Debug|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|x64.Build.0 = Debug|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|Win32.ActiveCfg = Release|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|Win32.Build.0 = Release|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|x64.ActiveCfg = Release|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|x64.Build.0 = Release|x64
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Debug|Win32.ActiveCfg = Debug|Win32
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Debug|Win32.Build.0 = Debug|Win32
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Debug|x64.ActiveCfg = Debug|x64
@@ -62,18 +74,26 @@ Global
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Release|Win32.Build.0 = Release|Win32
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Release|x64.ActiveCfg = Release|x64
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Release|x64.Build.0 = Release|x64
-		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.SGC|Win32.ActiveCfg = SGC|Win32
-		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.SGC|Win32.Build.0 = SGC|Win32
-		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.SGC|x64.ActiveCfg = SGC|x64
-		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.SGC|x64.Build.0 = SGC|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|Win32.ActiveCfg = Debug|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|Win32.Build.0 = Debug|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|x64.ActiveCfg = Debug|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|x64.Build.0 = Debug|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|Win32.ActiveCfg = Release|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|Win32.Build.0 = Release|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|x64.ActiveCfg = Release|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|x64.Build.0 = Release|x64
 		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|Win32.ActiveCfg = Debug|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|Win32.Build.0 = Debug|Win32
 		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|x64.ActiveCfg = Debug|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|x64.Build.0 = Debug|x64
 		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|Win32.ActiveCfg = Release|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|Win32.Build.0 = Release|Win32
 		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|x64.ActiveCfg = Release|x64
-		{8128F0AE-848A-4985-945A-568796A6DDD7}.SGC|Win32.ActiveCfg = Release|Win32
-		{8128F0AE-848A-4985-945A-568796A6DDD7}.SGC|Win32.Build.0 = Release|Win32
-		{8128F0AE-848A-4985-945A-568796A6DDD7}.SGC|x64.ActiveCfg = Release|x64
-		{8128F0AE-848A-4985-945A-568796A6DDD7}.SGC|x64.Build.0 = Release|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|x64.Build.0 = Release|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCDebug|Win32.ActiveCfg = Debug|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCDebug|x64.ActiveCfg = Debug|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCRelease|Win32.ActiveCfg = Release|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCRelease|x64.ActiveCfg = Release|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/racket/src/worksp/gracket/gracket.vcproj b/racket/src/worksp/gracket/gracket.vcproj
index 582c09baee..fb802ad1c6 100644
--- a/racket/src/worksp/gracket/gracket.vcproj
+++ b/racket/src/worksp/gracket/gracket.vcproj
@@ -18,9 +18,9 @@
 	</ToolFiles>
 	<Configurations>
 		<Configuration
-			Name="Release|Win32"
+			Name="BRelease|Win32"
 			OutputDirectory="..\..\..\lib"
-			IntermediateDirectory="Release"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="1"
 			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
 			UseOfMFC="0"
@@ -65,9 +65,9 @@
 			/>
 		</Configuration>
 		<Configuration
-			Name="Debug|Win32"
+			Name="BDebug|Win32"
 			OutputDirectory="..\..\..\lib"
-			IntermediateDirectory="Debug"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="1"
 			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
 			UseOfMFC="0"
@@ -128,7 +128,7 @@
 			/>
 		</Configuration>
 		<Configuration
-			Name="Release|x64"
+			Name="BRelease|x64"
 			OutputDirectory="..\..\..\lib"
 			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="1"
@@ -182,7 +182,7 @@
 			/>
 		</Configuration>
 		<Configuration
-			Name="Debug|x64"
+			Name="BDebug|x64"
 			OutputDirectory="..\..\..\lib"
 			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="1"
@@ -224,6 +224,213 @@
 				TargetMachine="17"
 			/>
 		</Configuration>
+		<Configuration
+			Name="SRelease|Win32"
+			OutputDirectory="..\..\..\lib"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
+			ConfigurationType="1"
+			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="2"
+				EnableIntrinsicFunctions="true"
+				FavorSizeOrSpeed="1"
+				AdditionalIncludeDirectories="..,..\..\racket\gc,..\..\racket\include"
+				PreprocessorDefinitions="WIN32,NDEBUG,_WINDOWS,__WINDOWS__,GC_DLL,__STDC__,_CRT_SECURE_NO_DEPRECATE,USE_SENORA_GC"
+				StringPooling="true"
+				RuntimeLibrary="0"
+				EnableFunctionLevelLinking="true"
+				UsePrecompiledHeader="0"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+				DebugInformationFormat="3"
+				CompileAs="0"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="NDEBUG"
+				Culture="1033"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalOptions="/MACHINE:I386 /DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll"
+				AdditionalDependencies="WS2_32.lib User32.lib Advapi32.lib delayimp.lib"
+				OutputFile="..\..\..\lib\GRacketCGC.exe"
+				LinkIncremental="1"
+				SuppressStartupBanner="true"
+				IgnoreDefaultLibraryNames="libcd.lib"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="..\..\..\lib\GRacketCGC.pdb"
+				SubSystem="2"
+				StackReserveSize="8388608"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+			/>
+		</Configuration>
+		<Configuration
+			Name="SDebug|Win32"
+			OutputDirectory="..\..\..\lib"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
+			ConfigurationType="1"
+			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..,..\..\racket\gc,..\..\racket\include"
+				PreprocessorDefinitions="WIN32,_DEBUG,_WINDOWS,__WINDOWS__,GC_DLL,__STDC__,_CRT_SECURE_NO_DEPRECATE,USE_SENORA_GC"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="1"
+				UsePrecompiledHeader="0"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+				DebugInformationFormat="3"
+				CompileAs="0"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="NDEBUG"
+				Culture="1033"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalOptions="/MACHINE:I386 /DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll"
+				AdditionalDependencies="WS2_32.lib User32.lib Advapi32.lib delayimp.lib"
+				OutputFile="..\..\..\lib\GRacketCGC.exe"
+				SuppressStartupBanner="true"
+				IgnoreDefaultLibraryNames="libcd.lib"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="..\..\..\lib\GRacketCGC.pdb"
+				SubSystem="2"
+				StackReserveSize="8388608"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
+		<Configuration
+			Name="SRelease|x64"
+			OutputDirectory="..\..\..\lib"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
+			ConfigurationType="1"
+			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="2"
+				EnableIntrinsicFunctions="true"
+				FavorSizeOrSpeed="1"
+				AdditionalIncludeDirectories="..,..\..\racket\gc,..\..\racket\include"
+				PreprocessorDefinitions="WIN32,NDEBUG,_WINDOWS,__WINDOWS__,GC_DLL,__STDC__,_CRT_SECURE_NO_DEPRECATE,USE_SENORA_GC"
+				StringPooling="true"
+				RuntimeLibrary="0"
+				EnableFunctionLevelLinking="true"
+				UsePrecompiledHeader="0"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+				DebugInformationFormat="3"
+				CompileAs="0"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="NDEBUG"
+				Culture="1033"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalOptions=" /DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll"
+				AdditionalDependencies="WS2_32.lib User32.lib Advapi32.lib delayimp.lib"
+				OutputFile="..\..\..\lib\GRacketCGC.exe"
+				LinkIncremental="1"
+				SuppressStartupBanner="true"
+				IgnoreDefaultLibraryNames="libcd.lib"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="..\..\..\lib\GRacketCGC.pdb"
+				SubSystem="2"
+				StackReserveSize="8388608"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+				TargetMachine="17"
+			/>
+		</Configuration>
+		<Configuration
+			Name="SDebug|x64"
+			OutputDirectory="..\..\..\lib"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
+			ConfigurationType="1"
+			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..,..\..\racket\gc,..\..\racket\include"
+				PreprocessorDefinitions="WIN32,_DEBUG,_WINDOWS,__WINDOWS__,GC_DLL,__STDC__,_CRT_SECURE_NO_DEPRECATE,USE_SENORA_GC"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="1"
+				UsePrecompiledHeader="0"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+				DebugInformationFormat="3"
+				CompileAs="0"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="NDEBUG"
+				Culture="1033"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalOptions="/MACHINE:I386 /DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll"
+				AdditionalDependencies="WS2_32.lib User32.lib Advapi32.lib delayimp.lib"
+				OutputFile="..\..\..\lib\GRacketCGC.exe"
+				SuppressStartupBanner="true"
+				IgnoreDefaultLibraryNames="libcd.lib"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="..\..\..\lib\GRacketCGC.pdb"
+				SubSystem="2"
+				StackReserveSize="8388608"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+				TargetMachine="17"
+			/>
+		</Configuration>
 	</Configurations>
 	<References>
 	</References>
diff --git a/racket/src/worksp/gracket/gracket.vcxproj b/racket/src/worksp/gracket/gracket.vcxproj
index f6503cbc78..a6c884249d 100644
--- a/racket/src/worksp/gracket/gracket.vcxproj
+++ b/racket/src/worksp/gracket/gracket.vcxproj
@@ -1,20 +1,36 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup Label="ProjectConfigurations">
-    <ProjectConfiguration Include="Debug|Win32">
-      <Configuration>Debug</Configuration>
+    <ProjectConfiguration Include="BDebug|Win32">
+      <Configuration>BDebug</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
-    <ProjectConfiguration Include="Debug|x64">
-      <Configuration>Debug</Configuration>
+    <ProjectConfiguration Include="BDebug|x64">
+      <Configuration>BDebug</Configuration>
       <Platform>x64</Platform>
     </ProjectConfiguration>
-    <ProjectConfiguration Include="Release|Win32">
-      <Configuration>Release</Configuration>
+    <ProjectConfiguration Include="BRelease|Win32">
+      <Configuration>BRelease</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
-    <ProjectConfiguration Include="Release|x64">
-      <Configuration>Release</Configuration>
+    <ProjectConfiguration Include="BRelease|x64">
+      <Configuration>BRelease</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="SDebug|Win32">
+      <Configuration>SDebug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="SDebug|x64">
+      <Configuration>SDebug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="SRelease|Win32">
+      <Configuration>SRelease</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="SRelease|x64">
+      <Configuration>SRelease</Configuration>
       <Platform>x64</Platform>
     </ProjectConfiguration>
   </ItemGroup>
@@ -22,20 +38,7 @@
     <ProjectGuid>{D59A2B28-330B-41F5-8261-F5BC1019E163}</ProjectGuid>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
-    <ConfigurationType>Application</ConfigurationType>
-    <UseOfMfc>false</UseOfMfc>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
-    <ConfigurationType>Application</ConfigurationType>
-    <UseOfMfc>false</UseOfMfc>
-    <CharacterSet>MultiByte</CharacterSet>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
-    <ConfigurationType>Application</ConfigurationType>
-    <UseOfMfc>false</UseOfMfc>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
+  <PropertyGroup Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseOfMfc>false</UseOfMfc>
     <CharacterSet>MultiByte</CharacterSet>
@@ -43,19 +46,7 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-    <Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
-  </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-    <Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
-  </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-    <Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
-  </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="PropertySheets">
+  <ImportGroup Label="PropertySheets">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
     <Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
   </ImportGroup>
@@ -66,18 +57,10 @@
     <OutDir>..\..\..\lib\</OutDir>
     <IntDir>$(Platform)\$(Configuration)\</IntDir>
   </PropertyGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+  <ItemDefinitionGroup>
     <ClCompile>
-      <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
-      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
       <AdditionalIncludeDirectories>..;..\..\racket\gc;..\..\racket\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;__WINDOWS__;GC_DLL;__STDC__;_CRT_SECURE_NO_DEPRECATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <StringPooling>true</StringPooling>
-      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
-      <FunctionLevelLinking>true</FunctionLevelLinking>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
+      <PrecompiledHeader></PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
       <SuppressStartupBanner>true</SuppressStartupBanner>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
@@ -88,7 +71,7 @@
       <Culture>0x0409</Culture>
     </ResourceCompile>
     <Link>
-      <AdditionalOptions>/MACHINE:I386 /DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions>/DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll %(AdditionalOptions)</AdditionalOptions>
       <AdditionalDependencies>WS2_32.lib;User32.lib;Advapi32.lib;delayimp.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <OutputFile>..\..\..\lib\GRacketCGC.exe</OutputFile>
       <SuppressStartupBanner>true</SuppressStartupBanner>
@@ -102,107 +85,91 @@
       </DataExecutionPrevention>
     </Link>
   </ItemDefinitionGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='BRelease|Win32'">
+    <ClCompile>
+      <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;__WINDOWS__;GC_DLL;__STDC__;_CRT_SECURE_NO_DEPRECATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+    </ClCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='BDebug|Win32'">
     <ClCompile>
       <Optimization>Disabled</Optimization>
-      <AdditionalIncludeDirectories>..;..\..\racket\gc;..\..\racket\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;__WINDOWS__;GC_DLL;__STDC__;_CRT_SECURE_NO_DEPRECATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
       <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <CompileAs>Default</CompileAs>
     </ClCompile>
-    <ResourceCompile>
-      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <Culture>0x0409</Culture>
-    </ResourceCompile>
-    <Link>
-      <AdditionalOptions>/MACHINE:I386 /DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll %(AdditionalOptions)</AdditionalOptions>
-      <AdditionalDependencies>WS2_32.lib;User32.lib;Advapi32.lib;delayimp.lib;%(AdditionalDependencies)</AdditionalDependencies>
-      <OutputFile>..\..\..\lib\GRacketCGC.exe</OutputFile>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <IgnoreSpecificDefaultLibraries>libcd.lib;%(IgnoreSpecificDefaultLibraries)</IgnoreSpecificDefaultLibraries>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <ProgramDatabaseFile>..\..\..\lib\GRacketCGC.pdb</ProgramDatabaseFile>
-      <SubSystem>Windows</SubSystem>
-      <StackReserveSize>8388608</StackReserveSize>
-      <RandomizedBaseAddress>false</RandomizedBaseAddress>
-      <DataExecutionPrevention>
-      </DataExecutionPrevention>
-    </Link>
   </ItemDefinitionGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='BRelease|x64'">
     <ClCompile>
       <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
-      <AdditionalIncludeDirectories>..;..\..\racket\gc;..\..\racket\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;__WINDOWS__;GC_DLL;__STDC__;_CRT_SECURE_NO_DEPRECATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <StringPooling>true</StringPooling>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <FunctionLevelLinking>true</FunctionLevelLinking>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <CompileAs>Default</CompileAs>
     </ClCompile>
-    <ResourceCompile>
-      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <Culture>0x0409</Culture>
-    </ResourceCompile>
     <Link>
-      <AdditionalOptions> /DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll %(AdditionalOptions)</AdditionalOptions>
-      <AdditionalDependencies>WS2_32.lib;User32.lib;Advapi32.lib;delayimp.lib;%(AdditionalDependencies)</AdditionalDependencies>
-      <OutputFile>..\..\..\lib\GRacketCGC.exe</OutputFile>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <IgnoreSpecificDefaultLibraries>libcd.lib;%(IgnoreSpecificDefaultLibraries)</IgnoreSpecificDefaultLibraries>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <ProgramDatabaseFile>..\..\..\lib\GRacketCGC.pdb</ProgramDatabaseFile>
-      <SubSystem>Windows</SubSystem>
-      <StackReserveSize>8388608</StackReserveSize>
-      <RandomizedBaseAddress>false</RandomizedBaseAddress>
-      <DataExecutionPrevention>
-      </DataExecutionPrevention>
       <TargetMachine>MachineX64</TargetMachine>
     </Link>
   </ItemDefinitionGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='BDebug|x64'">
     <ClCompile>
       <Optimization>Disabled</Optimization>
-      <AdditionalIncludeDirectories>..;..\..\racket\gc;..\..\racket\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;__WINDOWS__;GC_DLL;__STDC__;_CRT_SECURE_NO_DEPRECATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
       <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <CompileAs>Default</CompileAs>
     </ClCompile>
-    <ResourceCompile>
-      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <Culture>0x0409</Culture>
-    </ResourceCompile>
     <Link>
-      <AdditionalOptions>/MACHINE:I386 /DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll %(AdditionalOptions)</AdditionalOptions>
-      <AdditionalDependencies>WS2_32.lib;User32.lib;Advapi32.lib;delayimp.lib;%(AdditionalDependencies)</AdditionalDependencies>
-      <OutputFile>..\..\..\lib\GRacketCGC.exe</OutputFile>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <IgnoreSpecificDefaultLibraries>libcd.lib;%(IgnoreSpecificDefaultLibraries)</IgnoreSpecificDefaultLibraries>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <ProgramDatabaseFile>..\..\..\lib\GRacketCGC.pdb</ProgramDatabaseFile>
-      <SubSystem>Windows</SubSystem>
-      <StackReserveSize>8388608</StackReserveSize>
-      <RandomizedBaseAddress>false</RandomizedBaseAddress>
-      <DataExecutionPrevention>
-      </DataExecutionPrevention>
+      <TargetMachine>MachineX64</TargetMachine>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='SRelease|Win32'">
+    <ClCompile>
+      <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;__WINDOWS__;GC_DLL;__STDC__;_CRT_SECURE_NO_DEPRECATE;USE_SENORA_GC;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+    </ClCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='SDebug|Win32'">
+    <ClCompile>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;__WINDOWS__;GC_DLL;__STDC__;_CRT_SECURE_NO_DEPRECATE;USE_SENORA_GC;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
+    </ClCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='SRelease|x64'">
+    <ClCompile>
+      <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;__WINDOWS__;GC_DLL;__STDC__;_CRT_SECURE_NO_DEPRECATE;USE_SENORA_GC;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+    </ClCompile>
+    <Link>
+      <TargetMachine>MachineX64</TargetMachine>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='SDebug|x64'">
+    <ClCompile>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;__WINDOWS__;GC_DLL;__STDC__;_CRT_SECURE_NO_DEPRECATE;USE_SENORA_GC;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
+    </ClCompile>
+    <Link>
       <TargetMachine>MachineX64</TargetMachine>
     </Link>
   </ItemDefinitionGroup>
diff --git a/racket/src/worksp/gracket/gracket9.sln b/racket/src/worksp/gracket/gracket9.sln
index 95f4827c45..9483b22b34 100644
--- a/racket/src/worksp/gracket/gracket9.sln
+++ b/racket/src/worksp/gracket/gracket9.sln
@@ -4,50 +4,78 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "GRacket", "gracket.vcproj",
 	ProjectSection(ProjectDependencies) = postProject
 		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90} = {A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F} = {66548E7B-294E-40EF-B7C0-C8D6D7E6234F}
+		{8128F0AE-848A-4985-945A-568796A6DDD7} = {8128F0AE-848A-4985-945A-568796A6DDD7}
 	EndProjectSection
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "libracket", "..\libracket\libracket.vcproj", "{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}"
 	ProjectSection(ProjectDependencies) = postProject
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A} = {7DB29F1E-06FD-4E39-97FF-1C7922F6901A}
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F} = {66548E7B-294E-40EF-B7C0-C8D6D7E6234F}
+		{8128F0AE-848A-4985-945A-568796A6DDD7} = {8128F0AE-848A-4985-945A-568796A6DDD7}
 	EndProjectSection
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "libmzgc", "..\libmzgc\libmzgc.vcproj", "{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "libffi", "..\libffi\libffi.vcproj", "{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}"
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "sgc", "..\sgc\sgc.vcproj", "{8128F0AE-848A-4985-945A-568796A6DDD7}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Win32 = Debug|Win32
 		Debug|x64 = Debug|x64
 		Release|Win32 = Release|Win32
 		Release|x64 = Release|x64
+		AltGCDebug|Win32 = AltGCDebug|Win32
+		AltGCDebug|x64 = AltGCDebug|x64
+		AltGCRelease|Win32 = AltGCRelease|Win32
+		AltGCRelease|x64 = AltGCRelease|x64
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Debug|Win32.ActiveCfg = Debug|Win32
-		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Debug|Win32.Build.0 = Debug|Win32
-		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Debug|x64.ActiveCfg = Debug|x64
-		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Debug|x64.Build.0 = Debug|x64
-		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Release|Win32.ActiveCfg = Release|Win32
-		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Release|Win32.Build.0 = Release|Win32
-		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Release|x64.ActiveCfg = Release|x64
-		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Release|x64.Build.0 = Release|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|Win32.ActiveCfg = Debug|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|Win32.Build.0 = Debug|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|x64.ActiveCfg = Debug|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|x64.Build.0 = Debug|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|Win32.ActiveCfg = Release|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|Win32.Build.0 = Release|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|x64.ActiveCfg = Release|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|x64.Build.0 = Release|x64
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Debug|Win32.ActiveCfg = SDebug|Win32
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Debug|Win32.Build.0 = SDebug|Win32
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Debug|x64.ActiveCfg = SDebug|x64
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Debug|x64.Build.0 = SDebug|x64
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Release|Win32.ActiveCfg = SRelease|Win32
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Release|Win32.Build.0 = SRelease|Win32
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Release|x64.ActiveCfg = SRelease|x64
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.Release|x64.Build.0 = SRelease|x64
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.AltGCDebug|Win32.ActiveCfg = BDebug|Win32
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.AltGCDebug|Win32.Build.0 = BDebug|Win32
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.AltGCDebug|x64.ActiveCfg = BDebug|x64
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.AltGCDebug|x64.Build.0 = BDebug|x64
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.AltGCRelease|Win32.ActiveCfg = BRelease|Win32
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.AltGCRelease|Win32.Build.0 = BRelease|Win32
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.AltGCRelease|x64.ActiveCfg = BRelease|x64
+		{D59A2B28-330B-41F5-8261-F5BC1019E163}.AltGCRelease|x64.Build.0 = BRelease|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|Win32.ActiveCfg = SDebug|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|Win32.Build.0 = SDebug|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|x64.ActiveCfg = SDebug|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|x64.Build.0 = SDebug|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|Win32.ActiveCfg = SRelease|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|Win32.Build.0 = SRelease|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|x64.ActiveCfg = SRelease|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|x64.Build.0 = SRelease|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCDebug|Win32.ActiveCfg = BDebug|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCDebug|Win32.Build.0 = BDebug|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCDebug|x64.ActiveCfg = BDebug|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCDebug|x64.Build.0 = BDebug|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCRelease|Win32.ActiveCfg = BRelease|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCRelease|Win32.Build.0 = BRelease|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCRelease|x64.ActiveCfg = BRelease|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCRelease|x64.Build.0 = BRelease|x64
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|Win32.ActiveCfg = Debug|Win32
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|Win32.Build.0 = Debug|Win32
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|x64.ActiveCfg = Debug|x64
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|x64.Build.0 = Debug|x64
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|Win32.ActiveCfg = Release|Win32
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|Win32.Build.0 = Release|Win32
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|x64.ActiveCfg = Release|x64
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|x64.Build.0 = Release|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|Win32.ActiveCfg = Debug|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|Win32.Build.0 = Debug|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|x64.ActiveCfg = Debug|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|x64.Build.0 = Debug|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|Win32.ActiveCfg = Release|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|Win32.Build.0 = Release|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|x64.ActiveCfg = Release|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|x64.Build.0 = Release|x64
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Debug|Win32.ActiveCfg = Debug|Win32
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Debug|Win32.Build.0 = Debug|Win32
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Debug|x64.ActiveCfg = Debug|x64
@@ -56,6 +84,26 @@ Global
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Release|Win32.Build.0 = Release|Win32
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Release|x64.ActiveCfg = Release|x64
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Release|x64.Build.0 = Release|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|Win32.ActiveCfg = Debug|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|Win32.Build.0 = Debug|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|x64.ActiveCfg = Debug|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|x64.Build.0 = Debug|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|Win32.ActiveCfg = Release|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|Win32.Build.0 = Release|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|x64.ActiveCfg = Release|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|x64.Build.0 = Release|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|Win32.ActiveCfg = Debug|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|Win32.Build.0 = Debug|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|x64.ActiveCfg = Debug|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|x64.Build.0 = Debug|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|Win32.ActiveCfg = Release|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|Win32.Build.0 = Release|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|x64.ActiveCfg = Release|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|x64.Build.0 = Release|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCDebug|Win32.ActiveCfg = Debug|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCDebug|x64.ActiveCfg = Debug|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCRelease|Win32.ActiveCfg = Release|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCRelease|x64.ActiveCfg = Release|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/racket/src/worksp/libffi/libffi.vcproj b/racket/src/worksp/libffi/libffi.vcproj
index 3ab77801eb..838a33a2e9 100644
--- a/racket/src/worksp/libffi/libffi.vcproj
+++ b/racket/src/worksp/libffi/libffi.vcproj
@@ -22,7 +22,7 @@
 		<Configuration
 			Name="Debug|Win32"
 			OutputDirectory="$(SolutionDir)$(ConfigurationName)"
-			IntermediateDirectory="$(ConfigurationName)"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="4"
 			CharacterSet="1"
 			>
@@ -62,27 +62,6 @@
 		<Configuration
 			Name="Release|Win32"
 			OutputDirectory="$(SolutionDir)$(ConfigurationName)"
-			IntermediateDirectory="$(ConfigurationName)"
-			ConfigurationType="4"
-			CharacterSet="1"
-			WholeProgramOptimization="1"
-			>
-			<Tool
-				Name="VCCLCompilerTool"
-				Optimization="2"
-				EnableIntrinsicFunctions="true"
-				AdditionalIncludeDirectories="..\libffi;..\..\foreign\libffi\include;..\..\foreign\libffi\src\x86"
-				PreprocessorDefinitions="WIN32;NDEBUG;_LIB"
-				RuntimeLibrary="0"
-				EnableFunctionLevelLinking="true"
-				UsePrecompiledHeader="0"
-				WarningLevel="3"
-				DebugInformationFormat="3"
-			/>
-		</Configuration>
-		<Configuration
-			Name="Release|x64"
-			OutputDirectory="$(SolutionDir)$(PlatformName)\$(ConfigurationName)"
 			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="4"
 			CharacterSet="1"
@@ -102,28 +81,7 @@
 			/>
 		</Configuration>
 		<Configuration
-			Name="SGC|Win32"
-			OutputDirectory="$(SolutionDir)$(ConfigurationName)"
-			IntermediateDirectory="$(ConfigurationName)"
-			ConfigurationType="4"
-			CharacterSet="1"
-			WholeProgramOptimization="1"
-			>
-			<Tool
-				Name="VCCLCompilerTool"
-				Optimization="2"
-				EnableIntrinsicFunctions="true"
-				AdditionalIncludeDirectories="..\libffi;..\..\foreign\libffi\include;..\..\foreign\libffi\src\x86"
-				PreprocessorDefinitions="WIN32;NDEBUG;_LIB"
-				RuntimeLibrary="0"
-				EnableFunctionLevelLinking="true"
-				UsePrecompiledHeader="0"
-				WarningLevel="3"
-				DebugInformationFormat="3"
-			/>
-		</Configuration>
-		<Configuration
-			Name="SGC|x64"
+			Name="Release|x64"
 			OutputDirectory="$(SolutionDir)$(PlatformName)\$(ConfigurationName)"
 			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="4"
@@ -211,24 +169,6 @@
 						Outputs="x64/Release/win32.obj"
 					/>
 				</FileConfiguration>
-				<FileConfiguration
-					Name="SGC|Win32"
-					>
-					<Tool
-						Name="VCCustomBuildTool"
-						CommandLine="cl.exe /EP /I . /I ../../foreign/libffi/src/x86 win32.asm &gt; Release/win32_plain.asm&#x0D;&#x0A;ml.exe /c /Cx /coff /Fo Release/win32.obj Release/win32_plain.asm&#x0D;&#x0A;"
-						Outputs="Release/win32.obj"
-					/>
-				</FileConfiguration>
-				<FileConfiguration
-					Name="SGC|x64"
-					>
-					<Tool
-						Name="VCCustomBuildTool"
-						CommandLine="cl.exe /EP /I . /I ../../foreign/libffi/src/x86 win32.asm &gt; x64/Release/win32_plain.asm&#x0D;&#x0A;ml64.exe /c /Cx /Fo x64/Release/win32.obj x64/Release/win32_plain.asm&#x0D;&#x0A;"
-						Outputs="x64/Release/win32.obj"
-					/>
-				</FileConfiguration>
 			</File>
 		</Filter>
 		<Filter
diff --git a/racket/src/worksp/libffi/libffi.vcxproj b/racket/src/worksp/libffi/libffi.vcxproj
index 23a80b3825..d74beb6785 100644
--- a/racket/src/worksp/libffi/libffi.vcxproj
+++ b/racket/src/worksp/libffi/libffi.vcxproj
@@ -17,14 +17,6 @@
       <Configuration>Release</Configuration>
       <Platform>x64</Platform>
     </ProjectConfiguration>
-    <ProjectConfiguration Include="SGC|Win32">
-      <Configuration>SGC</Configuration>
-      <Platform>Win32</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="SGC|x64">
-      <Configuration>SGC</Configuration>
-      <Platform>x64</Platform>
-    </ProjectConfiguration>
   </ItemGroup>
   <PropertyGroup Label="Globals">
     <ProjectGuid>{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}</ProjectGuid>
@@ -32,11 +24,6 @@
     <Keyword>Win32Proj</Keyword>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='SGC|Win32'" Label="Configuration">
-    <ConfigurationType>StaticLibrary</ConfigurationType>
-    <CharacterSet>Unicode</CharacterSet>
-    <WholeProgramOptimization>true</WholeProgramOptimization>
-  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <CharacterSet>Unicode</CharacterSet>
@@ -46,11 +33,6 @@
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <CharacterSet>Unicode</CharacterSet>
   </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='SGC|x64'" Label="Configuration">
-    <ConfigurationType>StaticLibrary</ConfigurationType>
-    <CharacterSet>Unicode</CharacterSet>
-    <WholeProgramOptimization>true</WholeProgramOptimization>
-  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <CharacterSet>Unicode</CharacterSet>
@@ -63,18 +45,12 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='SGC|Win32'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-  </ImportGroup>
   <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="PropertySheets">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
   <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="PropertySheets">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='SGC|x64'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-  </ImportGroup>
   <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="PropertySheets">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
@@ -143,34 +119,6 @@
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
     </ClCompile>
   </ItemDefinitionGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='SGC|Win32'">
-    <ClCompile>
-      <Optimization>MaxSpeed</Optimization>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
-      <AdditionalIncludeDirectories>..\libffi;..\..\foreign\libffi\include;..\..\foreign\libffi\src\x86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
-      <FunctionLevelLinking>true</FunctionLevelLinking>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-    </ClCompile>
-  </ItemDefinitionGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='SGC|x64'">
-    <ClCompile>
-      <Optimization>MaxSpeed</Optimization>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
-      <AdditionalIncludeDirectories>..\libffi;..\..\foreign\libffi\include;..\..\foreign\libffi\src\x86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
-      <FunctionLevelLinking>true</FunctionLevelLinking>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-    </ClCompile>
-  </ItemDefinitionGroup>
   <ItemGroup>
     <ClCompile Include="..\..\foreign\libffi\src\closures.c" />
     <ClCompile Include="..\..\foreign\libffi\src\x86\ffi.c" />
@@ -196,14 +144,6 @@ ml.exe /c /Cx /coff /Fo Release/win32.obj Release/win32_plain.asm
 ml64.exe /c /Cx /Fo x64/Release/win32.obj x64/Release/win32_plain.asm
 </Command>
       <Outputs Condition="'$(Configuration)|$(Platform)'=='Release|x64'">x64/Release/win32.obj;%(Outputs)</Outputs>
-      <Command Condition="'$(Configuration)|$(Platform)'=='SGC|Win32'">cl.exe /EP /I . /I ../../foreign/libffi/src/x86 win32.asm &gt; Release/win32_plain.asm
-ml.exe /c /Cx /coff /Fo Release/win32.obj Release/win32_plain.asm
-</Command>
-      <Outputs Condition="'$(Configuration)|$(Platform)'=='SGC|Win32'">Release/win32.obj;%(Outputs)</Outputs>
-      <Command Condition="'$(Configuration)|$(Platform)'=='SGC|x64'">cl.exe /EP /I . /I ../../foreign/libffi/src/x86 win32.asm &gt; x64/Release/win32_plain.asm
-ml64.exe /c /Cx /Fo x64/Release/win32.obj x64/Release/win32_plain.asm
-</Command>
-      <Outputs Condition="'$(Configuration)|$(Platform)'=='SGC|x64'">x64/Release/win32.obj;%(Outputs)</Outputs>
     </CustomBuild>
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
diff --git a/racket/src/worksp/libmzgc/libmzgc.vcproj b/racket/src/worksp/libmzgc/libmzgc.vcproj
index 5c68a916f8..03265edec8 100644
--- a/racket/src/worksp/libmzgc/libmzgc.vcproj
+++ b/racket/src/worksp/libmzgc/libmzgc.vcproj
@@ -20,7 +20,7 @@
 		<Configuration
 			Name="Debug|Win32"
 			OutputDirectory="..\..\..\lib"
-			IntermediateDirectory="Debug"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="2"
 			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
 			UseOfMFC="0"
@@ -101,7 +101,7 @@
 		<Configuration
 			Name="Release|Win32"
 			OutputDirectory="..\..\..\lib"
-			IntermediateDirectory="Release"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="2"
 			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
 			UseOfMFC="0"
@@ -184,92 +184,6 @@
 				TargetMachine="17"
 			/>
 		</Configuration>
-		<Configuration
-			Name="SGC|Win32"
-			OutputDirectory="..\..\..\lib"
-			IntermediateDirectory="$(ConfigurationName)"
-			ConfigurationType="2"
-			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
-			UseOfMFC="0"
-			ATLMinimizesCRunTimeLibraryUsage="false"
-			CharacterSet="2"
-			>
-			<Tool
-				Name="VCCLCompilerTool"
-				InlineFunctionExpansion="2"
-				EnableIntrinsicFunctions="true"
-				FavorSizeOrSpeed="1"
-				AdditionalIncludeDirectories="..\..\Racket\Gc\Include,$(NOINHERIT)"
-				PreprocessorDefinitions="WIN32;NDEBUG;_WINDOWS;_USRDLL;GC_BUILD;SILENT;OLD_BLOCK_ALLOC;LARGE_CONFIG;ATOMIC_UNCOLLECTABLE;INITIAL_MARK_STACK_SIZE=8192;GC_DLL;_CRT_SECURE_NO_DEPRECATE"
-				StringPooling="true"
-				RuntimeLibrary="0"
-				EnableFunctionLevelLinking="true"
-				UsePrecompiledHeader="0"
-				WarningLevel="3"
-				SuppressStartupBanner="true"
-				DebugInformationFormat="3"
-				CompileAs="0"
-			/>
-			<Tool
-				Name="VCResourceCompilerTool"
-				PreprocessorDefinitions="NDEBUG"
-				Culture="1033"
-			/>
-			<Tool
-				Name="VCLinkerTool"
-				AdditionalOptions="/MACHINE:I386"
-				AdditionalDependencies="User32.lib"
-				OutputFile="..\..\..\lib\$(ProjectName)xxxxxxx.dll"
-				SuppressStartupBanner="true"
-				GenerateDebugInformation="true"
-				RandomizedBaseAddress="1"
-				DataExecutionPrevention="0"
-				ImportLibrary="..\..\..\lib\msvc\$(ProjectName)xxxxxxx.lib"
-			/>
-		</Configuration>
-		<Configuration
-			Name="SGC|x64"
-			OutputDirectory="..\..\..\lib"
-			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
-			ConfigurationType="2"
-			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
-			UseOfMFC="0"
-			ATLMinimizesCRunTimeLibraryUsage="false"
-			CharacterSet="2"
-			>
-			<Tool
-				Name="VCCLCompilerTool"
-				InlineFunctionExpansion="2"
-				EnableIntrinsicFunctions="true"
-				FavorSizeOrSpeed="1"
-				AdditionalIncludeDirectories="..\..\Racket\Gc\Include,$(NOINHERIT)"
-				PreprocessorDefinitions="WIN32;NDEBUG;_WINDOWS;_USRDLL;GC_BUILD;SILENT;OLD_BLOCK_ALLOC;LARGE_CONFIG;ATOMIC_UNCOLLECTABLE;INITIAL_MARK_STACK_SIZE=8192;GC_DLL;_CRT_SECURE_NO_DEPRECATE"
-				StringPooling="true"
-				RuntimeLibrary="0"
-				EnableFunctionLevelLinking="true"
-				UsePrecompiledHeader="0"
-				WarningLevel="3"
-				SuppressStartupBanner="true"
-				DebugInformationFormat="3"
-				CompileAs="0"
-			/>
-			<Tool
-				Name="VCResourceCompilerTool"
-				PreprocessorDefinitions="NDEBUG"
-				Culture="1033"
-			/>
-			<Tool
-				Name="VCLinkerTool"
-				AdditionalDependencies="User32.lib"
-				OutputFile="..\..\..\lib\$(ProjectName)xxxxxxx.dll"
-				SuppressStartupBanner="true"
-				GenerateDebugInformation="true"
-				RandomizedBaseAddress="1"
-				DataExecutionPrevention="0"
-				ImportLibrary="..\..\..\lib\msvc\$(ProjectName)xxxxxxx.lib"
-				TargetMachine="17"
-			/>
-		</Configuration>
 	</Configurations>
 	<References>
 	</References>
@@ -279,75 +193,75 @@
 			Filter="cpp;c;cxx;rc;def;r;odl;idl;hpj;bat"
 			>
 			<File
-				RelativePath="..\..\Racket\Gc\Allchblk.c"
+				RelativePath="..\..\racket\gc\allchblk.c"
 				>
 			</File>
 			<File
-				RelativePath="..\..\Racket\Gc\Alloc.c"
+				RelativePath="..\..\racket\gc\alloc.c"
 				>
 			</File>
 			<File
-				RelativePath="..\..\Racket\Gc\Blacklst.c"
+				RelativePath="..\..\racket\gc\blacklst.c"
 				>
 			</File>
 			<File
-				RelativePath="..\..\Racket\Gc\Dyn_load.c"
+				RelativePath="..\..\racket\gc\dyn_load.c"
 				>
 			</File>
 			<File
-				RelativePath="..\..\Racket\Gc\Finalize.c"
+				RelativePath="..\..\racket\gc\finalize.c"
 				>
 			</File>
 			<File
-				RelativePath="..\..\Racket\Gc\Headers.c"
+				RelativePath="..\..\racket\gc\headers.c"
 				>
 			</File>
 			<File
-				RelativePath="..\..\Racket\Gc\Mach_dep.c"
+				RelativePath="..\..\racket\gc\mach_dep.c"
 				>
 			</File>
 			<File
-				RelativePath="..\..\Racket\Gc\Malloc.c"
+				RelativePath="..\..\racket\gc\malloc.c"
 				>
 			</File>
 			<File
-				RelativePath="..\..\Racket\Gc\Mallocx.c"
+				RelativePath="..\..\racket\gc\mallocx.c"
 				>
 			</File>
 			<File
-				RelativePath="..\..\Racket\Gc\Mark.c"
+				RelativePath="..\..\racket\gc\mark.c"
 				>
 			</File>
 			<File
-				RelativePath="..\..\Racket\Gc\Mark_rts.c"
+				RelativePath="..\..\racket\gc\mark_rts.c"
 				>
 			</File>
 			<File
-				RelativePath="..\..\Racket\Gc\Misc.c"
+				RelativePath="..\..\racket\gc\misc.c"
 				>
 			</File>
 			<File
-				RelativePath="..\..\Racket\Gc\New_hblk.c"
+				RelativePath="..\..\racket\gc\new_hblk.c"
 				>
 			</File>
 			<File
-				RelativePath="..\..\Racket\Gc\Obj_map.c"
+				RelativePath="..\..\racket\gc\obj_map.c"
 				>
 			</File>
 			<File
-				RelativePath="..\..\Racket\Gc\Os_dep.c"
+				RelativePath="..\..\racket\gc\os_dep.c"
 				>
 			</File>
 			<File
-				RelativePath="..\..\Racket\Gc\Reclaim.c"
+				RelativePath="..\..\racket\gc\reclaim.c"
 				>
 			</File>
 			<File
-				RelativePath="..\..\Racket\Gc\Stubborn.c"
+				RelativePath="..\..\racket\gc\stubborn.c"
 				>
 			</File>
 			<File
-				RelativePath="..\..\Racket\Gc\win32_threads.c"
+				RelativePath="..\..\racket\gc\win32_threads.c"
 				>
 			</File>
 		</Filter>
diff --git a/racket/src/worksp/libmzgc/libmzgc.vcxproj b/racket/src/worksp/libmzgc/libmzgc.vcxproj
index 2b32196623..d1eccc80ba 100644
--- a/racket/src/worksp/libmzgc/libmzgc.vcxproj
+++ b/racket/src/worksp/libmzgc/libmzgc.vcxproj
@@ -17,24 +17,11 @@
       <Configuration>Release</Configuration>
       <Platform>x64</Platform>
     </ProjectConfiguration>
-    <ProjectConfiguration Include="SGC|Win32">
-      <Configuration>SGC</Configuration>
-      <Platform>Win32</Platform>
-    </ProjectConfiguration>
-    <ProjectConfiguration Include="SGC|x64">
-      <Configuration>SGC</Configuration>
-      <Platform>x64</Platform>
-    </ProjectConfiguration>
   </ItemGroup>
   <PropertyGroup Label="Globals">
     <ProjectGuid>{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}</ProjectGuid>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='SGC|Win32'" Label="Configuration">
-    <ConfigurationType>DynamicLibrary</ConfigurationType>
-    <UseOfMfc>false</UseOfMfc>
-    <CharacterSet>MultiByte</CharacterSet>
-  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseOfMfc>false</UseOfMfc>
@@ -45,11 +32,6 @@
     <UseOfMfc>false</UseOfMfc>
     <CharacterSet>MultiByte</CharacterSet>
   </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='SGC|x64'" Label="Configuration">
-    <ConfigurationType>DynamicLibrary</ConfigurationType>
-    <UseOfMfc>false</UseOfMfc>
-    <CharacterSet>MultiByte</CharacterSet>
-  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseOfMfc>false</UseOfMfc>
@@ -63,10 +45,6 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='SGC|Win32'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-    <Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
-  </ImportGroup>
   <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="PropertySheets">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
     <Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
@@ -75,10 +53,6 @@
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     <Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
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-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='SGC|x64'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-    <Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
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   <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="PropertySheets">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
     <Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
@@ -221,91 +195,25 @@
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     </Link>
   </ItemDefinitionGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='SGC|Win32'">
-    <ClCompile>
-      <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
-      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
-      <AdditionalIncludeDirectories>..\..\Racket\Gc\Include</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;GC_BUILD;SILENT;OLD_BLOCK_ALLOC;LARGE_CONFIG;ATOMIC_UNCOLLECTABLE;INITIAL_MARK_STACK_SIZE=8192;GC_DLL;_CRT_SECURE_NO_DEPRECATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <StringPooling>true</StringPooling>
-      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
-      <FunctionLevelLinking>true</FunctionLevelLinking>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <CompileAs>Default</CompileAs>
-    </ClCompile>
-    <ResourceCompile>
-      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <Culture>0x0409</Culture>
-    </ResourceCompile>
-    <Link>
-      <AdditionalOptions>/MACHINE:I386 %(AdditionalOptions)</AdditionalOptions>
-      <AdditionalDependencies>User32.lib;%(AdditionalDependencies)</AdditionalDependencies>
-      <OutputFile>..\..\..\lib\$(ProjectName)xxxxxxx.dll</OutputFile>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <RandomizedBaseAddress>false</RandomizedBaseAddress>
-      <DataExecutionPrevention>
-      </DataExecutionPrevention>
-      <ImportLibrary>..\..\..\lib\msvc\$(ProjectName)xxxxxxx.lib</ImportLibrary>
-    </Link>
-  </ItemDefinitionGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='SGC|x64'">
-    <ClCompile>
-      <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
-      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
-      <AdditionalIncludeDirectories>..\..\Racket\Gc\Include</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;GC_BUILD;SILENT;OLD_BLOCK_ALLOC;LARGE_CONFIG;ATOMIC_UNCOLLECTABLE;INITIAL_MARK_STACK_SIZE=8192;GC_DLL;_CRT_SECURE_NO_DEPRECATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <StringPooling>true</StringPooling>
-      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
-      <FunctionLevelLinking>true</FunctionLevelLinking>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <CompileAs>Default</CompileAs>
-    </ClCompile>
-    <ResourceCompile>
-      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <Culture>0x0409</Culture>
-    </ResourceCompile>
-    <Link>
-      <AdditionalDependencies>User32.lib;%(AdditionalDependencies)</AdditionalDependencies>
-      <OutputFile>..\..\..\lib\$(ProjectName)xxxxxxx.dll</OutputFile>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <RandomizedBaseAddress>false</RandomizedBaseAddress>
-      <DataExecutionPrevention>
-      </DataExecutionPrevention>
-      <ImportLibrary>..\..\..\lib\msvc\$(ProjectName)xxxxxxx.lib</ImportLibrary>
-      <TargetMachine>MachineX64</TargetMachine>
-    </Link>
-  </ItemDefinitionGroup>
   <ItemGroup>
-    <ClCompile Include="..\..\Racket\Gc\Allchblk.c" />
-    <ClCompile Include="..\..\Racket\Gc\Alloc.c" />
-    <ClCompile Include="..\..\Racket\Gc\Blacklst.c" />
-    <ClCompile Include="..\..\Racket\Gc\Dyn_load.c" />
-    <ClCompile Include="..\..\Racket\Gc\Finalize.c" />
-    <ClCompile Include="..\..\Racket\Gc\Headers.c" />
-    <ClCompile Include="..\..\Racket\Gc\Mach_dep.c" />
-    <ClCompile Include="..\..\Racket\Gc\Malloc.c" />
-    <ClCompile Include="..\..\Racket\Gc\Mallocx.c" />
-    <ClCompile Include="..\..\Racket\Gc\Mark.c" />
-    <ClCompile Include="..\..\Racket\Gc\Mark_rts.c" />
-    <ClCompile Include="..\..\Racket\Gc\Misc.c" />
-    <ClCompile Include="..\..\Racket\Gc\New_hblk.c" />
-    <ClCompile Include="..\..\Racket\Gc\Obj_map.c" />
-    <ClCompile Include="..\..\Racket\Gc\Os_dep.c" />
-    <ClCompile Include="..\..\Racket\Gc\Reclaim.c" />
-    <ClCompile Include="..\..\Racket\Gc\Stubborn.c" />
-    <ClCompile Include="..\..\Racket\Gc\win32_threads.c" />
+    <ClCompile Include="..\..\racket\gc\allchblk.c" />
+    <ClCompile Include="..\..\racket\gc\alloc.c" />
+    <ClCompile Include="..\..\racket\gc\blacklst.c" />
+    <ClCompile Include="..\..\racket\gc\dyn_load.c" />
+    <ClCompile Include="..\..\racket\gc\finalize.c" />
+    <ClCompile Include="..\..\racket\gc\headers.c" />
+    <ClCompile Include="..\..\racket\gc\mach_dep.c" />
+    <ClCompile Include="..\..\racket\gc\malloc.c" />
+    <ClCompile Include="..\..\racket\gc\mallocx.c" />
+    <ClCompile Include="..\..\racket\gc\mark.c" />
+    <ClCompile Include="..\..\racket\gc\mark_rts.c" />
+    <ClCompile Include="..\..\racket\gc\misc.c" />
+    <ClCompile Include="..\..\racket\gc\new_hblk.c" />
+    <ClCompile Include="..\..\racket\gc\obj_map.c" />
+    <ClCompile Include="..\..\racket\gc\os_dep.c" />
+    <ClCompile Include="..\..\racket\gc\reclaim.c" />
+    <ClCompile Include="..\..\racket\gc\stubborn.c" />
+    <ClCompile Include="..\..\racket\gc\win32_threads.c" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
diff --git a/racket/src/worksp/libracket/libracket.vcproj b/racket/src/worksp/libracket/libracket.vcproj
index 0190386551..65c58ca59a 100644
--- a/racket/src/worksp/libracket/libracket.vcproj
+++ b/racket/src/worksp/libracket/libracket.vcproj
@@ -18,9 +18,9 @@
 	</ToolFiles>
 	<Configurations>
 		<Configuration
-			Name="Debug|Win32"
+			Name="BDebug|Win32"
 			OutputDirectory="..\..\..\lib"
-			IntermediateDirectory="Debug"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="2"
 			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
 			UseOfMFC="0"
@@ -60,7 +60,7 @@
 			/>
 		</Configuration>
 		<Configuration
-			Name="Debug|x64"
+			Name="BDebug|x64"
 			OutputDirectory="..\..\..\lib"
 			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="2"
@@ -103,9 +103,9 @@
 			/>
 		</Configuration>
 		<Configuration
-			Name="Release|Win32"
+			Name="BRelease|Win32"
 			OutputDirectory="..\..\..\lib"
-			IntermediateDirectory="Release"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="2"
 			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
 			UseOfMFC="0"
@@ -148,7 +148,7 @@
 			/>
 		</Configuration>
 		<Configuration
-			Name="Release|x64"
+			Name="BRelease|x64"
 			OutputDirectory="..\..\..\lib"
 			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="2"
@@ -193,9 +193,94 @@
 			/>
 		</Configuration>
 		<Configuration
-			Name="SGC|Win32"
+			Name="SDebug|Win32"
 			OutputDirectory="..\..\..\lib"
-			IntermediateDirectory="$(ConfigurationName)"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
+			ConfigurationType="2"
+			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..;..\..\racket\include;..\..\racket\src;..\libffi;..\..\foreign\libffi\src\x86;..\..\foreign\libffi\include;$(NOINHERIT)"
+				PreprocessorDefinitions="WIN32;_DEBUG;_WINDOWS;_USRDLL;GC_DLL;__STDC__;LIBMZ_EXPORTS;_CRT_SECURE_NO_DEPRECATE;USE_SENORA_GC"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="1"
+				EnableFunctionLevelLinking="true"
+				UsePrecompiledHeader="0"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+				DebugInformationFormat="3"
+				CompileAs="0"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="NDEBUG"
+				Culture="1033"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalOptions="/MACHINE:I386"
+				AdditionalDependencies="WS2_32.lib Shell32.lib User32.lib"
+				OutputFile="..\..\..\lib\libracketxxxxxxx.dll"
+				SuppressStartupBanner="true"
+				GenerateDebugInformation="true"
+				BaseAddress="0x10400000"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+				ImportLibrary="..\..\..\lib\msvc\libracketxxxxxxx.lib"
+			/>
+		</Configuration>
+		<Configuration
+			Name="SDebug|x64"
+			OutputDirectory="..\..\..\lib"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
+			ConfigurationType="2"
+			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..;..\..\racket\include;..\..\racket\src;..\libffi;..\..\foreign\libffi\src\x86;..\..\foreign\libffi\include;$(NOINHERIT)"
+				PreprocessorDefinitions="WIN32;_DEBUG;_WINDOWS;_USRDLL;GC_DLL;__STDC__;LIBMZ_EXPORTS;_CRT_SECURE_NO_DEPRECATE;USE_SENORA_GC"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="1"
+				EnableFunctionLevelLinking="true"
+				UsePrecompiledHeader="0"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+				DebugInformationFormat="3"
+				CompileAs="0"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="NDEBUG"
+				Culture="1033"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalOptions="/MACHINE:X64"
+				AdditionalDependencies="WS2_32.lib Shell32.lib User32.lib"
+				OutputFile="..\..\..\lib\libracketxxxxxxx.dll"
+				SuppressStartupBanner="true"
+				GenerateDebugInformation="true"
+				BaseAddress="0x10400000"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+				ImportLibrary="..\..\..\lib\msvc\libracketxxxxxxx.lib"
+				TargetMachine="17"
+			/>
+		</Configuration>
+		<Configuration
+			Name="SRelease|Win32"
+			OutputDirectory="..\..\..\lib"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="2"
 			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
 			UseOfMFC="0"
@@ -209,7 +294,7 @@
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 				AdditionalIncludeDirectories="..;..\..\racket\include;..\..\racket\src;..\libffi;..\..\foreign\libffi\src\x86;..\..\foreign\libffi\include;$(NOINHERIT)"
-				PreprocessorDefinitions="WIN32;NDEBUG;_WINDOWS;_USRDLL;GC_DLL;__STDC__;LIBMZ_EXPORTS;_CRT_SECURE_NO_DEPRECATE;USE_SENORA_GC;SGC_STD_DEBUGGING=1"
+				PreprocessorDefinitions="WIN32;NDEBUG;_WINDOWS;_USRDLL;GC_DLL;__STDC__;LIBMZ_EXPORTS;_CRT_SECURE_NO_DEPRECATE;USE_SENORA_GC"
 				StringPooling="true"
 				RuntimeLibrary="0"
 				EnableFunctionLevelLinking="true"
@@ -238,7 +323,7 @@
 			/>
 		</Configuration>
 		<Configuration
-			Name="SGC|x64"
+			Name="SRelease|x64"
 			OutputDirectory="..\..\..\lib"
 			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
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@@ -254,7 +339,7 @@
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 				AdditionalIncludeDirectories="..;..\..\racket\include;..\..\racket\src;..\libffi;..\..\foreign\libffi\src\x86;..\..\foreign\libffi\include;$(NOINHERIT)"
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+				PreprocessorDefinitions="WIN32;NDEBUG;_WINDOWS;_USRDLL;GC_DLL;__STDC__;LIBMZ_EXPORTS;_CRT_SECURE_NO_DEPRECATE;USE_SENORA_GC"
 				StringPooling="true"
 				RuntimeLibrary="0"
 				EnableFunctionLevelLinking="true"
@@ -291,51 +376,51 @@
 			Filter="cpp;c;cxx;rc;def;r;odl;idl;hpj;bat"
 			>
 			<File
-				RelativePath="..\..\Racket\Src\Bignum.c"
+				RelativePath="..\..\racket\src\bignum.c"
 				>
 			</File>
 			<File
-				RelativePath="..\..\Racket\Src\Bool.c"
+				RelativePath="..\..\racket\src\bool.c"
 				>
 			</File>
 			<File
-				RelativePath="..\..\Racket\Src\builtin.c"
+				RelativePath="..\..\racket\src\builtin.c"
 				>
 			</File>
 			<File
-				RelativePath="..\..\Racket\Src\Char.c"
+				RelativePath="..\..\racket\src\char.c"
 				>
 			</File>
 			<File
-				RelativePath="..\..\Racket\Src\Compenv.c"
+				RelativePath="..\..\racket\src\compenv.c"
 				>
 			</File>
 			<File
-				RelativePath="..\..\Racket\Src\Compile.c"
+				RelativePath="..\..\racket\src\compile.c"
 				>
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 			<File
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@@ -343,183 +428,183 @@
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+				RelativePath="..\..\racket\src\regexp.c"
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+				RelativePath="..\..\racket\src\resolve.c"
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+				RelativePath="..\..\racket\src\salloc.c"
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+				RelativePath="..\..\racket\src\sema.c"
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+				RelativePath="..\..\racket\src\setjmpup.c"
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+				RelativePath="..\..\racket\src\string.c"
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+				RelativePath="..\..\racket\src\struct.c"
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+				RelativePath="..\..\racket\src\syntax.c"
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-				RelativePath="..\..\Racket\Src\thread.c"
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+    <ProjectConfiguration Include="BDebug|x64">
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-      <FunctionLevelLinking>true</FunctionLevelLinking>
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-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <CompileAs>Default</CompileAs>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;GC_DLL;__STDC__;LIBMZ_EXPORTS;_CRT_SECURE_NO_DEPRECATE;USE_SENORA_GC;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
+    </ClCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='SDebug|x64'">
+    <ClCompile>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;GC_DLL;__STDC__;LIBMZ_EXPORTS;_CRT_SECURE_NO_DEPRECATE;USE_SENORA_GC;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
     </ClCompile>
-    <ResourceCompile>
-      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <Culture>0x0409</Culture>
-    </ResourceCompile>
     <Link>
-      <AdditionalOptions>/MACHINE:I386 %(AdditionalOptions)</AdditionalOptions>
-      <AdditionalDependencies>WS2_32.lib;Shell32.lib;User32.lib;%(AdditionalDependencies)</AdditionalDependencies>
-      <OutputFile>..\..\..\lib\libracketxxxxxxx.dll</OutputFile>
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-      <RandomizedBaseAddress>false</RandomizedBaseAddress>
-      <DataExecutionPrevention>
-      </DataExecutionPrevention>
-      <ImportLibrary>..\..\..\lib\msvc\libracketxxxxxxx.lib</ImportLibrary>
+      <TargetMachine>MachineX64</TargetMachine>
     </Link>
   </ItemDefinitionGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='SGC|x64'">
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='SRelease|Win32'">
     <ClCompile>
       <AdditionalOptions>/Oy- %(AdditionalOptions)</AdditionalOptions>
       <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
-      <AdditionalIncludeDirectories>..;..\..\racket\include;..\..\racket\src;..\libffi;..\..\foreign\libffi\src\x86;..\..\foreign\libffi\include</AdditionalIncludeDirectories>
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+      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;GC_DLL;__STDC__;LIBMZ_EXPORTS;_CRT_SECURE_NO_DEPRECATE;USE_SENORA_GC;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
-      <FunctionLevelLinking>true</FunctionLevelLinking>
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     </ClCompile>
-    <ResourceCompile>
-      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <Culture>0x0409</Culture>
-    </ResourceCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='SRelease|x64'">
+    <ClCompile>
+      <AdditionalOptions>/Oy- %(AdditionalOptions)</AdditionalOptions>
+      <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;GC_DLL;__STDC__;LIBMZ_EXPORTS;_CRT_SECURE_NO_DEPRECATE;USE_SENORA_GC;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </ClCompile>
     <Link>
-      <AdditionalDependencies>WS2_32.lib;Shell32.lib;User32.lib;%(AdditionalDependencies)</AdditionalDependencies>
-      <OutputFile>..\..\..\lib\libracketxxxxxxx.dll</OutputFile>
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-    <ClCompile Include="..\..\Racket\Src\Eval.c" />
-    <ClCompile Include="..\..\Racket\Src\File.c" />
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+    <ClCompile Include="..\..\racket\src\jitprep.c" />
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+    <ClCompile Include="..\..\racket\src\letrec_check.c" />
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+    <ClCompile Include="..\..\racket\src\marshal.c" />
+    <ClCompile Include="..\..\racket\src\mzrt.c" />
+    <ClCompile Include="..\..\racket\src\mzsj86.c" />
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diff --git a/racket/src/worksp/mrstart/mrstart.vcproj b/racket/src/worksp/mrstart/mrstart.vcproj
index 8f41e74936..c82054adde 100644
--- a/racket/src/worksp/mrstart/mrstart.vcproj
+++ b/racket/src/worksp/mrstart/mrstart.vcproj
@@ -20,7 +20,7 @@
 		<Configuration
 			Name="Release|Win32"
 			OutputDirectory="..\..\..\lib"
-			IntermediateDirectory="Release"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="1"
 			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
 			UseOfMFC="0"
diff --git a/racket/src/worksp/myssink/myssink.vcproj b/racket/src/worksp/myssink/myssink.vcproj
index 7ca2ff0eb4..4589cfb0ff 100644
--- a/racket/src/worksp/myssink/myssink.vcproj
+++ b/racket/src/worksp/myssink/myssink.vcproj
@@ -21,7 +21,7 @@
 		<Configuration
 			Name="Debug|Win32"
 			OutputDirectory="..\..\..\lib"
-			IntermediateDirectory="Debug"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="2"
 			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
 			UseOfATL="1"
@@ -130,7 +130,7 @@
 		<Configuration
 			Name="Release|Win32"
 			OutputDirectory="..\..\..\lib"
-			IntermediateDirectory="Release"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="2"
 			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
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diff --git a/racket/src/worksp/mzcom/mzcom.sln b/racket/src/worksp/mzcom/mzcom.sln
index 075e4d3b2e..9b1b78900a 100644
--- a/racket/src/worksp/mzcom/mzcom.sln
+++ b/racket/src/worksp/mzcom/mzcom.sln
@@ -18,56 +18,64 @@ Global
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 		Release|Win32 = Release|Win32
 		Release|x64 = Release|x64
-		SGC|Win32 = SGC|Win32
-		SGC|x64 = SGC|x64
+		AltGCDebug|Win32 = AltGCDebug|Win32
+		AltGCDebug|x64 = AltGCDebug|x64
+		AltGCRelease|Win32 = AltGCRelease|Win32
+		AltGCRelease|x64 = AltGCRelease|x64
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
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 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|Win32.ActiveCfg = Debug|Win32
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|Win32.Build.0 = Debug|Win32
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|x64.ActiveCfg = Debug|x64
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|x64.Build.0 = Debug|x64
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|Win32.ActiveCfg = Release|Win32
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|Win32.Build.0 = Release|Win32
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|x64.ActiveCfg = Release|x64
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|x64.Build.0 = Release|x64
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.SGC|Win32.ActiveCfg = SGC|Win32
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.SGC|x64.ActiveCfg = SGC|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|Win32.ActiveCfg = Debug|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|Win32.Build.0 = Debug|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|x64.ActiveCfg = Debug|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|x64.Build.0 = Debug|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|Win32.ActiveCfg = Release|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|Win32.Build.0 = Release|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|x64.ActiveCfg = Release|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|x64.Build.0 = Release|x64
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.3m|Win32.ActiveCfg = Release|Win32
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.3m|Win32.Build.0 = Release|Win32
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.3m|x64.ActiveCfg = Release|x64
@@ -80,20 +88,28 @@ Global
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Release|Win32.Build.0 = Release|Win32
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Release|x64.ActiveCfg = Release|x64
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Release|x64.Build.0 = Release|x64
-		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.SGC|Win32.ActiveCfg = SGC|Win32
-		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.SGC|Win32.Build.0 = SGC|Win32
-		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.SGC|x64.ActiveCfg = SGC|x64
-		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.SGC|x64.Build.0 = SGC|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|Win32.ActiveCfg = Debug|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|Win32.Build.0 = Debug|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|x64.ActiveCfg = Debug|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|x64.Build.0 = Debug|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|Win32.ActiveCfg = Release|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|Win32.Build.0 = Release|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|x64.ActiveCfg = Release|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|x64.Build.0 = Release|x64
 		{8128F0AE-848A-4985-945A-568796A6DDD7}.3m|Win32.ActiveCfg = Release|Win32
 		{8128F0AE-848A-4985-945A-568796A6DDD7}.3m|x64.ActiveCfg = Release|x64
 		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|Win32.ActiveCfg = Debug|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|Win32.Build.0 = Debug|Win32
 		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|x64.ActiveCfg = Debug|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|x64.Build.0 = Debug|x64
 		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|Win32.ActiveCfg = Release|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|Win32.Build.0 = Release|Win32
 		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|x64.ActiveCfg = Release|x64
-		{8128F0AE-848A-4985-945A-568796A6DDD7}.SGC|Win32.ActiveCfg = Release|Win32
-		{8128F0AE-848A-4985-945A-568796A6DDD7}.SGC|Win32.Build.0 = Release|Win32
-		{8128F0AE-848A-4985-945A-568796A6DDD7}.SGC|x64.ActiveCfg = Release|x64
-		{8128F0AE-848A-4985-945A-568796A6DDD7}.SGC|x64.Build.0 = Release|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|x64.Build.0 = Release|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCDebug|Win32.ActiveCfg = Debug|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCDebug|x64.ActiveCfg = Debug|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCRelease|Win32.ActiveCfg = Release|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCRelease|x64.ActiveCfg = Release|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/racket/src/worksp/mzcom/mzcom.vcproj b/racket/src/worksp/mzcom/mzcom.vcproj
index 72c02e8681..2b246feb76 100644
--- a/racket/src/worksp/mzcom/mzcom.vcproj
+++ b/racket/src/worksp/mzcom/mzcom.vcproj
@@ -18,9 +18,9 @@
 	</ToolFiles>
 	<Configurations>
 		<Configuration
-			Name="Debug|Win32"
+			Name="BDebug|Win32"
 			OutputDirectory="..\..\..\lib"
-			IntermediateDirectory="Debug"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="1"
 			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
 			UseOfMFC="0"
@@ -65,7 +65,7 @@
 			/>
 		</Configuration>
 		<Configuration
-			Name="Debug|x64"
+			Name="BDebug|x64"
 			OutputDirectory="..\..\..\lib"
 			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="1"
@@ -114,9 +114,9 @@
 			/>
 		</Configuration>
 		<Configuration
-			Name="Release|Win32"
+			Name="BRelease|Win32"
 			OutputDirectory="..\..\..\lib"
-			IntermediateDirectory="Release"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="1"
 			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
 			UseOfMFC="0"
@@ -165,7 +165,7 @@
 			/>
 		</Configuration>
 		<Configuration
-			Name="Release|x64"
+			Name="BRelease|x64"
 			OutputDirectory="..\..\..\lib"
 			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="1"
@@ -217,10 +217,210 @@
 				TargetMachine="17"
 			/>
 		</Configuration>
+		<Configuration
+			Name="SDebug|Win32"
+			OutputDirectory="..\..\..\lib"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
+			ConfigurationType="1"
+			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCMIDLTool"
+				TypeLibraryName="$(OutDir)\$(ProjectName).tlb"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..,..\..\racket\include,."
+				PreprocessorDefinitions="WIN32,_DEBUG,_WINDOWS,GC_DLL,USE_SENORA_GC"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="1"
+				UsePrecompiledHeader="0"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+				DebugInformationFormat="3"
+				CompileAs="0"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="_DEBUG"
+				Culture="1033"
+				AdditionalIncludeDirectories="..\..\mzcom,$(OutDir),$(NOINHERIT)"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalOptions="/MACHINE:I386 /DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll"
+				AdditionalDependencies="delayimp.lib"
+				OutputFile="..\..\..\lib\$(ProjectName)CGC.exe"
+				SuppressStartupBanner="true"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="..\..\..\lib\$(ProjectName)CGC.pdb"
+				SubSystem="2"
+                                StackReserveSize="8388608"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+			/>
+		</Configuration>
+		<Configuration
+			Name="SDebug|x64"
+			OutputDirectory="..\..\..\lib"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
+			ConfigurationType="1"
+			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="3"
+				TypeLibraryName="$(OutDir)\$(ProjectName).tlb"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..,..\..\racket\include,."
+				PreprocessorDefinitions="WIN32,_DEBUG,_WINDOWS,GC_DLL,USE_SENORA_GC"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="1"
+				UsePrecompiledHeader="0"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+				DebugInformationFormat="3"
+				CompileAs="0"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="_DEBUG"
+				Culture="1033"
+				AdditionalIncludeDirectories="..\..\mzcom,$(OutDir),$(NOINHERIT)"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalOptions="/MACHINE:I386 /DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll"
+				AdditionalDependencies="delayimp.lib"
+				OutputFile="..\..\..\lib\$(ProjectName)CGC.exe"
+				SuppressStartupBanner="true"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="..\..\..\lib\$(ProjectName)CGC.pdb"
+				SubSystem="2"
+                                StackReserveSize="8388608"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+				TargetMachine="17"
+			/>
+		</Configuration>
+		<Configuration
+			Name="SRelease|Win32"
+			OutputDirectory="..\..\..\lib"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
+			ConfigurationType="1"
+			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCMIDLTool"
+				TypeLibraryName="$(OutDir)\$(ProjectName).tlb"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="2"
+				EnableIntrinsicFunctions="true"
+				FavorSizeOrSpeed="1"
+				AdditionalIncludeDirectories="..,..\..\racket\include,."
+				PreprocessorDefinitions="WIN32,NDEBUG,_WINDOWS,GC_DLL,USE_SENORA_GC"
+				StringPooling="true"
+				RuntimeLibrary="0"
+				EnableFunctionLevelLinking="true"
+				UsePrecompiledHeader="0"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+				DebugInformationFormat="3"
+				CompileAs="0"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="NDEBUG"
+				Culture="1033"
+				AdditionalIncludeDirectories="..\..\mzcom,$(OutDir),$(NOINHERIT)"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalOptions="/MACHINE:I386 /DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll"
+				AdditionalDependencies="delayimp.lib"
+				OutputFile="..\..\..\lib\$(ProjectName)CGC.exe"
+				LinkIncremental="1"
+				SuppressStartupBanner="true"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="..\..\..\lib\$(ProjectName)CGC.pdb"
+				SubSystem="2"
+                                StackReserveSize="8388608"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+			/>
+		</Configuration>
+		<Configuration
+			Name="SRelease|x64"
+			OutputDirectory="..\..\..\lib"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
+			ConfigurationType="1"
+			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="3"
+				TypeLibraryName="$(OutDir)\$(ProjectName).tlb"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				InlineFunctionExpansion="2"
+				EnableIntrinsicFunctions="true"
+				FavorSizeOrSpeed="1"
+				AdditionalIncludeDirectories="..,..\..\racket\include,."
+				PreprocessorDefinitions="WIN32,NDEBUG,_WINDOWS,GC_DLL,USE_SENORA_GC"
+				StringPooling="true"
+				RuntimeLibrary="0"
+				EnableFunctionLevelLinking="true"
+				UsePrecompiledHeader="0"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+				DebugInformationFormat="3"
+				CompileAs="0"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="NDEBUG"
+				Culture="1033"
+				AdditionalIncludeDirectories="..\..\mzcom,$(OutDir),$(NOINHERIT)"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalOptions="/DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll"
+				AdditionalDependencies="delayimp.lib"
+				OutputFile="..\..\..\lib\$(ProjectName)CGC.exe"
+				LinkIncremental="1"
+				SuppressStartupBanner="true"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="..\..\..\lib\$(ProjectName)CGC.pdb"
+				SubSystem="2"
+                                StackReserveSize="8388608"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+				TargetMachine="17"
+			/>
+		</Configuration>
 		<Configuration
 			Name="3m|Win32"
 			OutputDirectory="..\..\..\lib"
-			IntermediateDirectory="3m"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="1"
 			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
 			UseOfMFC="0"
diff --git a/racket/src/worksp/mzcom/mzcom.vcxproj b/racket/src/worksp/mzcom/mzcom.vcxproj
index ce8e4556e6..1e07e64553 100644
--- a/racket/src/worksp/mzcom/mzcom.vcxproj
+++ b/racket/src/worksp/mzcom/mzcom.vcxproj
@@ -9,20 +9,36 @@
       <Configuration>3m</Configuration>
       <Platform>x64</Platform>
     </ProjectConfiguration>
-    <ProjectConfiguration Include="Debug|Win32">
-      <Configuration>Debug</Configuration>
+    <ProjectConfiguration Include="BDebug|Win32">
+      <Configuration>BDebug</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
-    <ProjectConfiguration Include="Debug|x64">
-      <Configuration>Debug</Configuration>
+    <ProjectConfiguration Include="BDebug|x64">
+      <Configuration>BDebug</Configuration>
       <Platform>x64</Platform>
     </ProjectConfiguration>
-    <ProjectConfiguration Include="Release|Win32">
-      <Configuration>Release</Configuration>
+    <ProjectConfiguration Include="BRelease|Win32">
+      <Configuration>BRelease</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
-    <ProjectConfiguration Include="Release|x64">
-      <Configuration>Release</Configuration>
+    <ProjectConfiguration Include="BRelease|x64">
+      <Configuration>BRelease</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="SDebug|Win32">
+      <Configuration>SDebug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="SDebug|x64">
+      <Configuration>SDebug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="SRelease|Win32">
+      <Configuration>SRelease</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="SRelease|x64">
+      <Configuration>SRelease</Configuration>
       <Platform>x64</Platform>
     </ProjectConfiguration>
   </ItemGroup>
@@ -30,32 +46,7 @@
     <ProjectGuid>{36F31050-55C6-41A3-A23E-3008EBFC1273}</ProjectGuid>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='3m|Win32'" Label="Configuration">
-    <ConfigurationType>Application</ConfigurationType>
-    <UseOfMfc>false</UseOfMfc>
-    <CharacterSet>MultiByte</CharacterSet>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
-    <ConfigurationType>Application</ConfigurationType>
-    <UseOfMfc>false</UseOfMfc>
-    <CharacterSet>MultiByte</CharacterSet>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
-    <ConfigurationType>Application</ConfigurationType>
-    <UseOfMfc>false</UseOfMfc>
-    <CharacterSet>MultiByte</CharacterSet>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='3m|x64'" Label="Configuration">
-    <ConfigurationType>Application</ConfigurationType>
-    <UseOfMfc>false</UseOfMfc>
-    <CharacterSet>MultiByte</CharacterSet>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
-    <ConfigurationType>Application</ConfigurationType>
-    <UseOfMfc>false</UseOfMfc>
-    <CharacterSet>MultiByte</CharacterSet>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+  <PropertyGroup Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseOfMfc>false</UseOfMfc>
     <CharacterSet>MultiByte</CharacterSet>
@@ -63,27 +54,7 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='3m|Win32'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-    <Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
-  </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-    <Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
-  </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-    <Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
-  </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='3m|x64'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-    <Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
-  </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-    <Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
-  </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="PropertySheets">
+  <ImportGroup Label="PropertySheets">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
     <Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
   </ImportGroup>
@@ -95,18 +66,13 @@
     <IntDir>$(Platform)\$(Configuration)\</IntDir>
     <LinkIncremental>false</LinkIncremental>
   </PropertyGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+  <ItemDefinitionGroup>
     <Midl>
       <TypeLibraryName>$(OutDir)$(ProjectName).tlb</TypeLibraryName>
     </Midl>
     <ClCompile>
-      <Optimization>Disabled</Optimization>
       <AdditionalIncludeDirectories>..;..\..\racket\include;.;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;GC_DLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
-      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
+      <PrecompiledHeader></PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
       <SuppressStartupBanner>true</SuppressStartupBanner>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
@@ -117,123 +83,6 @@
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-      <AdditionalDependencies>delayimp.lib;%(AdditionalDependencies)</AdditionalDependencies>
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-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <ProgramDatabaseFile>..\..\..\lib\$(ProjectName)CGC.pdb</ProgramDatabaseFile>
-      <SubSystem>Windows</SubSystem>
-      <StackReserveSize>8388608</StackReserveSize>
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-    <Midl>
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-    <ClCompile>
-      <Optimization>Disabled</Optimization>
-      <AdditionalIncludeDirectories>..;..\..\racket\include;.;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;GC_DLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
-      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <CompileAs>Default</CompileAs>
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-      <Culture>0x0409</Culture>
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-    <Link>
-      <AdditionalOptions>/MACHINE:I386 /DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll %(AdditionalOptions)</AdditionalOptions>
-      <AdditionalDependencies>delayimp.lib;%(AdditionalDependencies)</AdditionalDependencies>
-      <OutputFile>..\..\..\lib\$(ProjectName)CGC.exe</OutputFile>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <ProgramDatabaseFile>..\..\..\lib\$(ProjectName)CGC.pdb</ProgramDatabaseFile>
-      <SubSystem>Windows</SubSystem>
-      <StackReserveSize>8388608</StackReserveSize>
-      <RandomizedBaseAddress>false</RandomizedBaseAddress>
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-      <TargetMachine>MachineX64</TargetMachine>
-    </Link>
-  </ItemDefinitionGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
-    <Midl>
-      <TypeLibraryName>$(OutDir)$(ProjectName).tlb</TypeLibraryName>
-    </Midl>
-    <ClCompile>
-      <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
-      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
-      <AdditionalIncludeDirectories>..;..\..\racket\include;.;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;GC_DLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <StringPooling>true</StringPooling>
-      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
-      <FunctionLevelLinking>true</FunctionLevelLinking>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <CompileAs>Default</CompileAs>
-    </ClCompile>
-    <ResourceCompile>
-      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <Culture>0x0409</Culture>
-      <AdditionalIncludeDirectories>..\..\mzcom;$(OutDir)</AdditionalIncludeDirectories>
-    </ResourceCompile>
-    <Link>
-      <AdditionalOptions>/MACHINE:I386 /DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll %(AdditionalOptions)</AdditionalOptions>
-      <AdditionalDependencies>delayimp.lib;%(AdditionalDependencies)</AdditionalDependencies>
-      <OutputFile>..\..\..\lib\$(ProjectName)CGC.exe</OutputFile>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <ProgramDatabaseFile>..\..\..\lib\$(ProjectName)CGC.pdb</ProgramDatabaseFile>
-      <SubSystem>Windows</SubSystem>
-      <StackReserveSize>8388608</StackReserveSize>
-      <RandomizedBaseAddress>false</RandomizedBaseAddress>
-      <DataExecutionPrevention>
-      </DataExecutionPrevention>
-    </Link>
-  </ItemDefinitionGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
-    <Midl>
-      <TargetEnvironment>X64</TargetEnvironment>
-      <TypeLibraryName>$(OutDir)$(ProjectName).tlb</TypeLibraryName>
-    </Midl>
-    <ClCompile>
-      <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
-      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
-      <AdditionalIncludeDirectories>..;..\..\racket\include;.;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;GC_DLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <StringPooling>true</StringPooling>
-      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
-      <FunctionLevelLinking>true</FunctionLevelLinking>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <CompileAs>Default</CompileAs>
-    </ClCompile>
-    <ResourceCompile>
-      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <Culture>0x0409</Culture>
-      <AdditionalIncludeDirectories>..\..\mzcom;$(OutDir)</AdditionalIncludeDirectories>
-    </ResourceCompile>
     <Link>
       <AdditionalOptions>/DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll %(AdditionalOptions)</AdditionalOptions>
       <AdditionalDependencies>delayimp.lib;%(AdditionalDependencies)</AdditionalDependencies>
@@ -246,77 +95,106 @@
       <RandomizedBaseAddress>false</RandomizedBaseAddress>
       <DataExecutionPrevention>
       </DataExecutionPrevention>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='BDebug|Win32'">
+    <ClCompile>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;GC_DLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
+    </ClCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='BDebug|x64'">
+    <ClCompile>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;GC_DLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
+    </ClCompile>
+    <Link>
+      <TargetMachine>MachineX64</TargetMachine>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='BRelease|Win32'">
+    <ClCompile>
+      <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;GC_DLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+    </ClCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='BRelease|x64'">
+    <ClCompile>
+      <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;GC_DLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+    </ClCompile>
+    <Link>
+      <TargetMachine>MachineX64</TargetMachine>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='SDebug|Win32'">
+    <ClCompile>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;GC_DLL;USE_SENORA_GC;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
+    </ClCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='SDebug|x64'">
+    <ClCompile>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;GC_DLL;USE_SENORA_GC;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
+    </ClCompile>
+    <Link>
+      <TargetMachine>MachineX64</TargetMachine>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='SRelease|Win32'">
+    <ClCompile>
+      <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;GC_DLL;USE_SENORA_GC;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+    </ClCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='SRelease|x64'">
+    <ClCompile>
+      <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;GC_DLL;USE_SENORA_GC;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+    </ClCompile>
+    <Link>
       <TargetMachine>MachineX64</TargetMachine>
     </Link>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='3m|Win32'">
-    <Midl>
-      <TypeLibraryName>$(OutDir)$(ProjectName).tlb</TypeLibraryName>
-    </Midl>
     <ClCompile>
       <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
-      <AdditionalIncludeDirectories>..;..\..\racket\include;.;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;GC_DLL;MZCOM_3M;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <StringPooling>true</StringPooling>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <FunctionLevelLinking>true</FunctionLevelLinking>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <CompileAs>Default</CompileAs>
     </ClCompile>
-    <ResourceCompile>
-      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <Culture>0x0409</Culture>
-      <AdditionalIncludeDirectories>..\..\mzcom;$(OutDir)</AdditionalIncludeDirectories>
-    </ResourceCompile>
-    <ProjectReference>
-      <LinkLibraryDependencies>false</LinkLibraryDependencies>
-    </ProjectReference>
-    <Link>
-      <AdditionalOptions>/MACHINE:I386 /DELAYLOAD:libracket3mxxxxxxx.dll %(AdditionalOptions)</AdditionalOptions>
-      <AdditionalDependencies>delayimp.lib;..\..\..\lib\msvc\libracket3mxxxxxxx.lib;%(AdditionalDependencies)</AdditionalDependencies>
-      <OutputFile>..\..\..\lib\$(ProjectName).exe</OutputFile>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <ProgramDatabaseFile>..\..\..\lib\$(ProjectName).pdb</ProgramDatabaseFile>
-      <SubSystem>Windows</SubSystem>
-      <StackReserveSize>8388608</StackReserveSize>
-      <RandomizedBaseAddress>false</RandomizedBaseAddress>
-      <DataExecutionPrevention>
-      </DataExecutionPrevention>
-    </Link>
-  </ItemDefinitionGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='3m|x64'">
-    <Midl>
-      <TargetEnvironment>X64</TargetEnvironment>
-      <TypeLibraryName>$(OutDir)$(ProjectName).tlb</TypeLibraryName>
-    </Midl>
-    <ClCompile>
-      <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
-      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
-      <AdditionalIncludeDirectories>..;..\..\racket\include;.;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;GC_DLL;MZCOM_3M;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <StringPooling>true</StringPooling>
-      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
-      <FunctionLevelLinking>true</FunctionLevelLinking>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <CompileAs>Default</CompileAs>
-    </ClCompile>
-    <ResourceCompile>
-      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <Culture>0x0409</Culture>
-      <AdditionalIncludeDirectories>..\..\mzcom;$(OutDir)</AdditionalIncludeDirectories>
-    </ResourceCompile>
     <ProjectReference>
       <LinkLibraryDependencies>false</LinkLibraryDependencies>
     </ProjectReference>
@@ -324,14 +202,27 @@
       <AdditionalOptions>/DELAYLOAD:libracket3mxxxxxxx.dll %(AdditionalOptions)</AdditionalOptions>
       <AdditionalDependencies>delayimp.lib;..\..\..\lib\msvc\libracket3mxxxxxxx.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <OutputFile>..\..\..\lib\$(ProjectName).exe</OutputFile>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
       <ProgramDatabaseFile>..\..\..\lib\$(ProjectName).pdb</ProgramDatabaseFile>
-      <SubSystem>Windows</SubSystem>
-      <StackReserveSize>8388608</StackReserveSize>
-      <RandomizedBaseAddress>false</RandomizedBaseAddress>
-      <DataExecutionPrevention>
-      </DataExecutionPrevention>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='3m|x64'">
+    <ClCompile>
+      <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;GC_DLL;MZCOM_3M;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+    </ClCompile>
+    <ProjectReference>
+      <LinkLibraryDependencies>false</LinkLibraryDependencies>
+    </ProjectReference>
+    <Link>
+      <AdditionalOptions>/DELAYLOAD:libracket3mxxxxxxx.dll %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalDependencies>delayimp.lib;..\..\..\lib\msvc\libracket3mxxxxxxx.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <OutputFile>..\..\..\lib\$(ProjectName).exe</OutputFile>
+      <ProgramDatabaseFile>..\..\..\lib\$(ProjectName).pdb</ProgramDatabaseFile>
       <TargetMachine>MachineX64</TargetMachine>
     </Link>
   </ItemDefinitionGroup>
diff --git a/racket/src/worksp/mzcom/mzcom9.sln b/racket/src/worksp/mzcom/mzcom9.sln
index 5b5b3d72c2..4ca623bf26 100644
--- a/racket/src/worksp/mzcom/mzcom9.sln
+++ b/racket/src/worksp/mzcom/mzcom9.sln
@@ -4,18 +4,22 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "MzCOM", "MzCOM.vcproj", "{3
 	ProjectSection(ProjectDependencies) = postProject
 		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90} = {A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F} = {66548E7B-294E-40EF-B7C0-C8D6D7E6234F}
+		{8128F0AE-848A-4985-945A-568796A6DDD7} = {8128F0AE-848A-4985-945A-568796A6DDD7}
 	EndProjectSection
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "libracket", "..\libracket\libracket.vcproj", "{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}"
 	ProjectSection(ProjectDependencies) = postProject
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A} = {7DB29F1E-06FD-4E39-97FF-1C7922F6901A}
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F} = {66548E7B-294E-40EF-B7C0-C8D6D7E6234F}
+		{8128F0AE-848A-4985-945A-568796A6DDD7} = {8128F0AE-848A-4985-945A-568796A6DDD7}
 	EndProjectSection
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "libmzgc", "..\libmzgc\libmzgc.vcproj", "{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "libffi", "..\libffi\libffi.vcproj", "{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}"
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "sgc", "..\sgc\sgc.vcproj", "{8128F0AE-848A-4985-945A-568796A6DDD7}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		3m|Win32 = 3m|Win32
@@ -24,44 +28,64 @@ Global
 		Debug|x64 = Debug|x64
 		Release|Win32 = Release|Win32
 		Release|x64 = Release|x64
+		AltGCDebug|Win32 = AltGCDebug|Win32
+		AltGCDebug|x64 = AltGCDebug|x64
+		AltGCRelease|Win32 = AltGCRelease|Win32
+		AltGCRelease|x64 = AltGCRelease|x64
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
 		{36F31050-55C6-41A3-A23E-3008EBFC1273}.3m|Win32.ActiveCfg = 3m|Win32
 		{36F31050-55C6-41A3-A23E-3008EBFC1273}.3m|Win32.Build.0 = 3m|Win32
 		{36F31050-55C6-41A3-A23E-3008EBFC1273}.3m|x64.ActiveCfg = 3m|x64
 		{36F31050-55C6-41A3-A23E-3008EBFC1273}.3m|x64.Build.0 = 3m|x64
-		{36F31050-55C6-41A3-A23E-3008EBFC1273}.Debug|Win32.ActiveCfg = Debug|Win32
-		{36F31050-55C6-41A3-A23E-3008EBFC1273}.Debug|Win32.Build.0 = Debug|Win32
-		{36F31050-55C6-41A3-A23E-3008EBFC1273}.Debug|x64.ActiveCfg = Debug|x64
-		{36F31050-55C6-41A3-A23E-3008EBFC1273}.Debug|x64.Build.0 = Debug|x64
-		{36F31050-55C6-41A3-A23E-3008EBFC1273}.Release|Win32.ActiveCfg = Release|Win32
-		{36F31050-55C6-41A3-A23E-3008EBFC1273}.Release|Win32.Build.0 = Release|Win32
-		{36F31050-55C6-41A3-A23E-3008EBFC1273}.Release|x64.ActiveCfg = Release|x64
-		{36F31050-55C6-41A3-A23E-3008EBFC1273}.Release|x64.Build.0 = Release|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.3m|Win32.ActiveCfg = Release|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.3m|Win32.Build.0 = Release|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.3m|x64.ActiveCfg = Release|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.3m|x64.Build.0 = Release|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|Win32.ActiveCfg = Debug|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|Win32.Build.0 = Debug|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|x64.ActiveCfg = Debug|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|x64.Build.0 = Debug|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|Win32.ActiveCfg = Release|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|Win32.Build.0 = Release|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|x64.ActiveCfg = Release|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|x64.Build.0 = Release|x64
+		{36F31050-55C6-41A3-A23E-3008EBFC1273}.Debug|Win32.ActiveCfg = SDebug|Win32
+		{36F31050-55C6-41A3-A23E-3008EBFC1273}.Debug|Win32.Build.0 = SDebug|Win32
+		{36F31050-55C6-41A3-A23E-3008EBFC1273}.Debug|x64.ActiveCfg = SDebug|x64
+		{36F31050-55C6-41A3-A23E-3008EBFC1273}.Debug|x64.Build.0 = SDebug|x64
+		{36F31050-55C6-41A3-A23E-3008EBFC1273}.Release|Win32.ActiveCfg = SRelease|Win32
+		{36F31050-55C6-41A3-A23E-3008EBFC1273}.Release|Win32.Build.0 = SRelease|Win32
+		{36F31050-55C6-41A3-A23E-3008EBFC1273}.Release|x64.ActiveCfg = SRelease|x64
+		{36F31050-55C6-41A3-A23E-3008EBFC1273}.Release|x64.Build.0 = SRelease|x64
+		{36F31050-55C6-41A3-A23E-3008EBFC1273}.AltGCDebug|Win32.ActiveCfg = BDebug|Win32
+		{36F31050-55C6-41A3-A23E-3008EBFC1273}.AltGCDebug|Win32.Build.0 = BDebug|Win32
+		{36F31050-55C6-41A3-A23E-3008EBFC1273}.AltGCDebug|x64.ActiveCfg = BDebug|x64
+		{36F31050-55C6-41A3-A23E-3008EBFC1273}.AltGCDebug|x64.Build.0 = BDebug|x64
+		{36F31050-55C6-41A3-A23E-3008EBFC1273}.AltGCRelease|Win32.ActiveCfg = BRelease|Win32
+		{36F31050-55C6-41A3-A23E-3008EBFC1273}.AltGCRelease|Win32.Build.0 = BRelease|Win32
+		{36F31050-55C6-41A3-A23E-3008EBFC1273}.AltGCRelease|x64.ActiveCfg = BRelease|x64
+		{36F31050-55C6-41A3-A23E-3008EBFC1273}.AltGCRelease|x64.Build.0 = BRelease|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.3m|Win32.ActiveCfg = SRelease|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.3m|x64.ActiveCfg = SRelease|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|Win32.ActiveCfg = SDebug|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|Win32.Build.0 = SDebug|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|x64.ActiveCfg = SDebug|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|x64.Build.0 = SDebug|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|Win32.ActiveCfg = SRelease|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|Win32.Build.0 = SRelease|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|x64.ActiveCfg = SRelease|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|x64.Build.0 = SRelease|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCDebug|Win32.ActiveCfg = BDebug|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCDebug|Win32.Build.0 = BDebug|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCDebug|x64.ActiveCfg = BDebug|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCDebug|x64.Build.0 = BDebug|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCRelease|Win32.ActiveCfg = BRelease|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCRelease|Win32.Build.0 = BRelease|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCRelease|x64.ActiveCfg = BRelease|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCRelease|x64.Build.0 = BRelease|x64
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.3m|Win32.ActiveCfg = Release|Win32
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.3m|Win32.Build.0 = Release|Win32
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.3m|x64.ActiveCfg = Release|x64
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.3m|x64.Build.0 = Release|x64
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|Win32.ActiveCfg = Debug|Win32
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|Win32.Build.0 = Debug|Win32
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|x64.ActiveCfg = Debug|x64
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|x64.Build.0 = Debug|x64
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|Win32.ActiveCfg = Release|Win32
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|Win32.Build.0 = Release|Win32
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|x64.ActiveCfg = Release|x64
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|x64.Build.0 = Release|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|Win32.ActiveCfg = Debug|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|Win32.Build.0 = Debug|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|x64.ActiveCfg = Debug|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|x64.Build.0 = Debug|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|Win32.ActiveCfg = Release|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|Win32.Build.0 = Release|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|x64.ActiveCfg = Release|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|x64.Build.0 = Release|x64
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.3m|Win32.ActiveCfg = Release|Win32
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.3m|Win32.Build.0 = Release|Win32
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.3m|x64.ActiveCfg = Release|x64
@@ -74,6 +98,28 @@ Global
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Release|Win32.Build.0 = Release|Win32
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Release|x64.ActiveCfg = Release|x64
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Release|x64.Build.0 = Release|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|Win32.ActiveCfg = Debug|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|Win32.Build.0 = Debug|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|x64.ActiveCfg = Debug|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|x64.Build.0 = Debug|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|Win32.ActiveCfg = Release|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|Win32.Build.0 = Release|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|x64.ActiveCfg = Release|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|x64.Build.0 = Release|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.3m|Win32.ActiveCfg = Release|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.3m|x64.ActiveCfg = Release|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|Win32.ActiveCfg = Debug|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|Win32.Build.0 = Debug|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|x64.ActiveCfg = Debug|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|x64.Build.0 = Debug|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|Win32.ActiveCfg = Release|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|Win32.Build.0 = Release|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|x64.ActiveCfg = Release|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|x64.Build.0 = Release|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCDebug|Win32.ActiveCfg = Debug|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCDebug|x64.ActiveCfg = Debug|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCRelease|Win32.ActiveCfg = Release|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCRelease|x64.ActiveCfg = Release|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/racket/src/worksp/mzstart/mzstart.vcproj b/racket/src/worksp/mzstart/mzstart.vcproj
index 4b31d967ab..841362070a 100644
--- a/racket/src/worksp/mzstart/mzstart.vcproj
+++ b/racket/src/worksp/mzstart/mzstart.vcproj
@@ -20,7 +20,7 @@
 		<Configuration
 			Name="Release|Win32"
 			OutputDirectory="..\..\..\lib"
-			IntermediateDirectory="Release"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="1"
 			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
 			UseOfMFC="0"
diff --git a/racket/src/worksp/racket/racket.sln b/racket/src/worksp/racket/racket.sln
index 12db28972c..86dad338f6 100644
--- a/racket/src/worksp/racket/racket.sln
+++ b/racket/src/worksp/racket/racket.sln
@@ -16,44 +16,56 @@ Global
 		Debug|x64 = Debug|x64
 		Release|Win32 = Release|Win32
 		Release|x64 = Release|x64
-		SGC|Win32 = SGC|Win32
-		SGC|x64 = SGC|x64
+		AltGCDebug|Win32 = AltGCDebug|Win32
+		AltGCDebug|x64 = AltGCDebug|x64
+		AltGCRelease|Win32 = AltGCRelease|Win32
+		AltGCRelease|x64 = AltGCRelease|x64
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Debug|Win32.ActiveCfg = Debug|Win32
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Debug|Win32.Build.0 = Debug|Win32
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Debug|x64.ActiveCfg = Debug|x64
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Debug|x64.Build.0 = Debug|x64
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Release|Win32.ActiveCfg = Release|Win32
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Release|Win32.Build.0 = Release|Win32
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Release|x64.ActiveCfg = Release|x64
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Release|x64.Build.0 = Release|x64
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.SGC|Win32.ActiveCfg = SGC|Win32
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.SGC|Win32.Build.0 = SGC|Win32
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.SGC|x64.ActiveCfg = SGC|x64
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.SGC|x64.Build.0 = SGC|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|Win32.ActiveCfg = Debug|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|Win32.Build.0 = Debug|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|x64.ActiveCfg = Debug|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|x64.Build.0 = Debug|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|Win32.ActiveCfg = Release|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|Win32.Build.0 = Release|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|x64.ActiveCfg = Release|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|x64.Build.0 = Release|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.SGC|Win32.ActiveCfg = SGC|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.SGC|Win32.Build.0 = SGC|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.SGC|x64.ActiveCfg = SGC|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.SGC|x64.Build.0 = SGC|x64
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Debug|Win32.ActiveCfg = SDebug|Win32
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Debug|Win32.Build.0 = SDebug|Win32
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Debug|x64.ActiveCfg = SDebug|x64
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Debug|x64.Build.0 = SDebug|x64
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Release|Win32.ActiveCfg = SRelease|Win32
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Release|Win32.Build.0 = SRelease|Win32
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Release|x64.ActiveCfg = SRelease|x64
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Release|x64.Build.0 = SRelease|x64
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.AltGCDebug|Win32.ActiveCfg = BDebug|Win32
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.AltGCDebug|Win32.Build.0 = BDebug|Win32
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.AltGCDebug|x64.ActiveCfg = BDebug|x64
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.AltGCDebug|x64.Build.0 = BDebug|x64
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.AltGCRelease|Win32.ActiveCfg = BRelease|Win32
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.AltGCRelease|Win32.Build.0 = BRelease|Win32
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.AltGCRelease|x64.ActiveCfg = BRelease|x64
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.AltGCRelease|x64.Build.0 = BRelease|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|Win32.ActiveCfg = SDebug|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|Win32.Build.0 = SDebug|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|x64.ActiveCfg = SDebug|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|x64.Build.0 = SDebug|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|Win32.ActiveCfg = SRelease|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|Win32.Build.0 = SRelease|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|x64.ActiveCfg = SRelease|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|x64.Build.0 = SRelease|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCDebug|Win32.ActiveCfg = BDebug|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCDebug|Win32.Build.0 = BDebug|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCDebug|x64.ActiveCfg = BDebug|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCDebug|x64.Build.0 = BDebug|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCRelease|Win32.ActiveCfg = BRelease|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCRelease|Win32.Build.0 = BRelease|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCRelease|x64.ActiveCfg = BRelease|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCRelease|x64.Build.0 = BRelease|x64
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|Win32.ActiveCfg = Debug|Win32
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|Win32.Build.0 = Debug|Win32
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|x64.ActiveCfg = Debug|x64
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|x64.Build.0 = Debug|x64
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|Win32.ActiveCfg = Release|Win32
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|Win32.Build.0 = Release|Win32
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|x64.ActiveCfg = Release|x64
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|x64.Build.0 = Release|x64
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.SGC|Win32.ActiveCfg = SGC|Win32
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.SGC|x64.ActiveCfg = SGC|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|Win32.ActiveCfg = Debug|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|Win32.Build.0 = Debug|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|x64.ActiveCfg = Debug|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|x64.Build.0 = Debug|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|Win32.ActiveCfg = Release|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|Win32.Build.0 = Release|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|x64.ActiveCfg = Release|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|x64.Build.0 = Release|x64
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Debug|Win32.ActiveCfg = Debug|Win32
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Debug|Win32.Build.0 = Debug|Win32
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Debug|x64.ActiveCfg = Debug|x64
@@ -62,18 +74,26 @@ Global
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Release|Win32.Build.0 = Release|Win32
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Release|x64.ActiveCfg = Release|x64
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Release|x64.Build.0 = Release|x64
-		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.SGC|Win32.ActiveCfg = SGC|Win32
-		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.SGC|Win32.Build.0 = SGC|Win32
-		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.SGC|x64.ActiveCfg = SGC|x64
-		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.SGC|x64.Build.0 = SGC|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|Win32.ActiveCfg = Debug|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|Win32.Build.0 = Debug|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|x64.ActiveCfg = Debug|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|x64.Build.0 = Debug|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|Win32.ActiveCfg = Release|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|Win32.Build.0 = Release|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|x64.ActiveCfg = Release|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|x64.Build.0 = Release|x64
 		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|Win32.ActiveCfg = Debug|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|Win32.Build.0 = Debug|Win32
 		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|x64.ActiveCfg = Debug|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|x64.Build.0 = Debug|x64
 		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|Win32.ActiveCfg = Release|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|Win32.Build.0 = Release|Win32
 		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|x64.ActiveCfg = Release|x64
-		{8128F0AE-848A-4985-945A-568796A6DDD7}.SGC|Win32.ActiveCfg = Release|Win32
-		{8128F0AE-848A-4985-945A-568796A6DDD7}.SGC|Win32.Build.0 = Release|Win32
-		{8128F0AE-848A-4985-945A-568796A6DDD7}.SGC|x64.ActiveCfg = Release|x64
-		{8128F0AE-848A-4985-945A-568796A6DDD7}.SGC|x64.Build.0 = Release|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|x64.Build.0 = Release|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCDebug|Win32.ActiveCfg = Debug|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCDebug|x64.ActiveCfg = Debug|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCRelease|Win32.ActiveCfg = Release|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCRelease|x64.ActiveCfg = Release|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/racket/src/worksp/racket/racket.vcproj b/racket/src/worksp/racket/racket.vcproj
index 5287e7dc03..99825c062b 100644
--- a/racket/src/worksp/racket/racket.vcproj
+++ b/racket/src/worksp/racket/racket.vcproj
@@ -18,9 +18,9 @@
 	</ToolFiles>
 	<Configurations>
 		<Configuration
-			Name="Debug|Win32"
+			Name="BDebug|Win32"
 			OutputDirectory="..\..\.."
-			IntermediateDirectory="Debug"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="1"
 			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
 			UseOfMFC="0"
@@ -60,11 +60,11 @@
 			/>
 			<Tool
 				Name="VCPostBuildEventTool"
-				CommandLine="&#x0D;&#x0A;if exist &quot;$(TargetPath)&quot; goto :MzOK&#x0D;&#x0A;echo Error: did not find $(TargetPath)&#x0D;&#x0A;exit 1&#x0D;&#x0A;:MzOK&#x0D;&#x0A;&quot;$(TargetPath)&quot; -cu ..\..\racket\mkincludes.rkt &quot;$(TargetDir)/include/&quot; ..\..\racket ..&#x0D;&#x0A;if errorlevel 1 exit 1&#x0D;&#x0A;cd ..\..\racket\dynsrc&#x0D;&#x0A;mkmzdynd.bat&#x0D;&#x0A;cd ..\..\worksp\racket&#x0D;&#x0A;&#x0D;&#x0A;"
+				CommandLine="&#x0D;&#x0A;if exist &quot;$(TargetPath)&quot; goto :MzOK&#x0D;&#x0A;echo Error: did not find $(TargetPath)&#x0D;&#x0A;exit 1&#x0D;&#x0A;:MzOK&#x0D;&#x0A;&quot;$(TargetPath)&quot; -cu ..\..\racket\mkincludes.rkt &quot;$(TargetDir)/include/&quot; ..\..\racket ..&#x0D;&#x0A;if errorlevel 1 exit 1&#x0D;&#x0A;cd ..\..\racket\dynsrc&#x0D;&#x0A;mkmzdynd.bat $(ConfigurationName)&#x0D;&#x0A;cd ..\..\worksp\racket&#x0D;&#x0A;&#x0D;&#x0A;"
 			/>
 		</Configuration>
 		<Configuration
-			Name="Debug|x64"
+			Name="BDebug|x64"
 			OutputDirectory="..\..\.."
 			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="1"
@@ -131,13 +131,13 @@
 			/>
 			<Tool
 				Name="VCPostBuildEventTool"
-				CommandLine="&#x0D;&#x0A;if exist &quot;$(TargetPath)&quot; goto :MzOK&#x0D;&#x0A;echo Error: did not find $(TargetPath)&#x0D;&#x0A;exit 1&#x0D;&#x0A;:MzOK&#x0D;&#x0A;&quot;$(TargetPath)&quot; -cu ..\..\racket\mkincludes.rkt &quot;$(TargetDir)/include/&quot; ..\..\racket ..&#x0D;&#x0A;if errorlevel 1 exit 1&#x0D;&#x0A;cd ..\..\racket\dynsrc&#x0D;&#x0A;mkmzdynd.bat&#x0D;&#x0A;cd ..\..\worksp\racket&#x0D;&#x0A;&#x0D;&#x0A;"
+				CommandLine="&#x0D;&#x0A;if exist &quot;$(TargetPath)&quot; goto :MzOK&#x0D;&#x0A;echo Error: did not find $(TargetPath)&#x0D;&#x0A;exit 1&#x0D;&#x0A;:MzOK&#x0D;&#x0A;&quot;$(TargetPath)&quot; -cu ..\..\racket\mkincludes.rkt &quot;$(TargetDir)/include/&quot; ..\..\racket ..&#x0D;&#x0A;if errorlevel 1 exit 1&#x0D;&#x0A;cd ..\..\racket\dynsrc&#x0D;&#x0A;mkmzdynd.bat $(ConfigurationName)&#x0D;&#x0A;cd ..\..\worksp\racket&#x0D;&#x0A;&#x0D;&#x0A;"
 			/>
 		</Configuration>
 		<Configuration
-			Name="Release|Win32"
+			Name="BRelease|Win32"
 			OutputDirectory="..\..\.."
-			IntermediateDirectory="Release"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="1"
 			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
 			UseOfMFC="0"
@@ -181,11 +181,11 @@
 			/>
 			<Tool
 				Name="VCPostBuildEventTool"
-				CommandLine="&#x0D;&#x0A;if exist &quot;$(TargetPath)&quot; goto :MzOK&#x0D;&#x0A;echo Error: did not find $(TargetPath)&#x0D;&#x0A;exit 1&#x0D;&#x0A;:MzOK&#x0D;&#x0A;&quot;$(TargetPath)&quot; -cu ..\..\racket\mkincludes.rkt &quot;$(TargetDir)/include/&quot; ..\..\racket ..&#x0D;&#x0A;if errorlevel 1 exit 1&#x0D;&#x0A;cd ..\..\racket\dynsrc&#x0D;&#x0A;mkmzdyn.bat&#x0D;&#x0A;cd ..\..\worksp\racket&#x0D;&#x0A;&#x0D;&#x0A;"
+				CommandLine="&#x0D;&#x0A;if exist &quot;$(TargetPath)&quot; goto :MzOK&#x0D;&#x0A;echo Error: did not find $(TargetPath)&#x0D;&#x0A;exit 1&#x0D;&#x0A;:MzOK&#x0D;&#x0A;&quot;$(TargetPath)&quot; -cu ..\..\racket\mkincludes.rkt &quot;$(TargetDir)/include/&quot; ..\..\racket ..&#x0D;&#x0A;if errorlevel 1 exit 1&#x0D;&#x0A;cd ..\..\racket\dynsrc&#x0D;&#x0A;mkmzdyn.bat $(ConfigurationName)&#x0D;&#x0A;cd ..\..\worksp\racket&#x0D;&#x0A;&#x0D;&#x0A;"
 			/>
 		</Configuration>
 		<Configuration
-			Name="Release|x64"
+			Name="BRelease|x64"
 			OutputDirectory="..\..\.."
 			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="1"
@@ -233,13 +233,130 @@
 			/>
 			<Tool
 				Name="VCPostBuildEventTool"
-				CommandLine="&#x0D;&#x0A;if exist &quot;$(TargetPath)&quot; goto :MzOK&#x0D;&#x0A;echo Error: did not find $(TargetPath)&#x0D;&#x0A;exit 1&#x0D;&#x0A;:MzOK&#x0D;&#x0A;&quot;$(TargetPath)&quot; -cu ..\..\racket\mkincludes.rkt &quot;$(TargetDir)/include/&quot; ..\..\racket ..&#x0D;&#x0A;if errorlevel 1 exit 1&#x0D;&#x0A;cd ..\..\racket\dynsrc&#x0D;&#x0A;mkmzdyn.bat&#x0D;&#x0A;cd ..\..\worksp\racket&#x0D;&#x0A;&#x0D;&#x0A;"
+				CommandLine="&#x0D;&#x0A;if exist &quot;$(TargetPath)&quot; goto :MzOK&#x0D;&#x0A;echo Error: did not find $(TargetPath)&#x0D;&#x0A;exit 1&#x0D;&#x0A;:MzOK&#x0D;&#x0A;&quot;$(TargetPath)&quot; -cu ..\..\racket\mkincludes.rkt &quot;$(TargetDir)/include/&quot; ..\..\racket ..&#x0D;&#x0A;if errorlevel 1 exit 1&#x0D;&#x0A;cd ..\..\racket\dynsrc&#x0D;&#x0A;mkmzdyn.bat $(ConfigurationName)&#x0D;&#x0A;cd ..\..\worksp\racket&#x0D;&#x0A;&#x0D;&#x0A;"
 			/>
 		</Configuration>
 		<Configuration
-			Name="SGC|Win32"
+			Name="SDebug|Win32"
 			OutputDirectory="..\..\.."
-			IntermediateDirectory="$(ConfigurationName)"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
+			ConfigurationType="1"
+			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..,..\..\racket\include,$(NOINHERIT)"
+				PreprocessorDefinitions="WIN32,_DEBUG,_CONSOLE,GC_DLL,_CRT_SECURE_NO_DEPRECATE,USE_SENORA_GC"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="1"
+				UsePrecompiledHeader="0"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+				DebugInformationFormat="3"
+				CompileAs="0"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="_DEBUG"
+				Culture="1033"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalOptions="/MACHINE:I386 /DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll"
+				AdditionalDependencies="delayimp.lib user32.lib"
+				OutputFile="..\..\..\RacketCGC.exe"
+				SuppressStartupBanner="true"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="..\..\..\RacketCGC.pdb"
+				SubSystem="1"
+				StackReserveSize="8388608"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+				CommandLine="&#x0D;&#x0A;if exist &quot;$(TargetPath)&quot; goto :MzOK&#x0D;&#x0A;echo Error: did not find $(TargetPath)&#x0D;&#x0A;exit 1&#x0D;&#x0A;:MzOK&#x0D;&#x0A;&quot;$(TargetPath)&quot; -cu ..\..\racket\mkincludes.rkt &quot;$(TargetDir)/include/&quot; ..\..\racket ..&#x0D;&#x0A;if errorlevel 1 exit 1&#x0D;&#x0A;cd ..\..\racket\dynsrc&#x0D;&#x0A;mkmzdyn.bat $(ConfigurationName)&#x0D;&#x0A;cd ..\..\worksp\racket&#x0D;&#x0A;&#x0D;&#x0A;"
+			/>
+		</Configuration>
+		<Configuration
+			Name="SDebug|x64"
+			OutputDirectory="..\..\.."
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
+			ConfigurationType="1"
+			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
+			UseOfMFC="0"
+			ATLMinimizesCRunTimeLibraryUsage="false"
+			CharacterSet="2"
+			>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				AdditionalIncludeDirectories="..,..\..\racket\include,$(NOINHERIT)"
+				PreprocessorDefinitions="WIN32,_DEBUG,_CONSOLE,GC_DLL,_CRT_SECURE_NO_DEPRECATE,USE_SENORA_GC"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="1"
+				UsePrecompiledHeader="0"
+				WarningLevel="3"
+				SuppressStartupBanner="true"
+				DebugInformationFormat="3"
+				CompileAs="0"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+				PreprocessorDefinitions="_DEBUG"
+				Culture="1033"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				AdditionalOptions="/MACHINE:X64 /DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll"
+				AdditionalDependencies="delayimp.lib user32.lib"
+				OutputFile="..\..\..\RacketCGC.exe"
+				SuppressStartupBanner="true"
+				GenerateDebugInformation="true"
+				ProgramDatabaseFile="..\..\..\RacketCGC.pdb"
+				SubSystem="1"
+				StackReserveSize="8388608"
+				RandomizedBaseAddress="1"
+				DataExecutionPrevention="0"
+				TargetMachine="17"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+				CommandLine="&#x0D;&#x0A;if exist &quot;$(TargetPath)&quot; goto :MzOK&#x0D;&#x0A;echo Error: did not find $(TargetPath)&#x0D;&#x0A;exit 1&#x0D;&#x0A;:MzOK&#x0D;&#x0A;&quot;$(TargetPath)&quot; -cu ..\..\racket\mkincludes.rkt &quot;$(TargetDir)/include/&quot; ..\..\racket ..&#x0D;&#x0A;if errorlevel 1 exit 1&#x0D;&#x0A;cd ..\..\racket\dynsrc&#x0D;&#x0A;mkmzdyn.bat $(ConfigurationName)&#x0D;&#x0A;cd ..\..\worksp\racket&#x0D;&#x0A;&#x0D;&#x0A;"
+			/>
+		</Configuration>
+		<Configuration
+			Name="SRelease|Win32"
+			OutputDirectory="..\..\.."
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="1"
 			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"
 			UseOfMFC="0"
@@ -252,7 +369,7 @@
 				EnableIntrinsicFunctions="true"
 				FavorSizeOrSpeed="1"
 				AdditionalIncludeDirectories="..,..\..\racket\include,$(NOINHERIT)"
-				PreprocessorDefinitions="WIN32,NDEBUG,_CONSOLE,GC_DLL,_CRT_SECURE_NO_DEPRECATE"
+				PreprocessorDefinitions="WIN32,NDEBUG,_CONSOLE,GC_DLL,_CRT_SECURE_NO_DEPRECATE,USE_SENORA_GC"
 				StringPooling="true"
 				RuntimeLibrary="0"
 				EnableFunctionLevelLinking="true"
@@ -283,11 +400,11 @@
 			/>
 			<Tool
 				Name="VCPostBuildEventTool"
-				CommandLine="&#x0D;&#x0A;if exist &quot;$(TargetPath)&quot; goto :MzOK&#x0D;&#x0A;echo Error: did not find $(TargetPath)&#x0D;&#x0A;exit 1&#x0D;&#x0A;:MzOK&#x0D;&#x0A;&quot;$(TargetPath)&quot; -cu ..\..\racket\mkincludes.rkt &quot;$(TargetDir)/include/&quot; ..\..\racket ..&#x0D;&#x0A;if errorlevel 1 exit 1&#x0D;&#x0A;cd ..\..\racket\dynsrc&#x0D;&#x0A;mkmzdyn.bat&#x0D;&#x0A;cd ..\..\worksp\racket&#x0D;&#x0A;&#x0D;&#x0A;"
+				CommandLine="&#x0D;&#x0A;if exist &quot;$(TargetPath)&quot; goto :MzOK&#x0D;&#x0A;echo Error: did not find $(TargetPath)&#x0D;&#x0A;exit 1&#x0D;&#x0A;:MzOK&#x0D;&#x0A;&quot;$(TargetPath)&quot; -cu ..\..\racket\mkincludes.rkt &quot;$(TargetDir)/include/&quot; ..\..\racket ..&#x0D;&#x0A;if errorlevel 1 exit 1&#x0D;&#x0A;cd ..\..\racket\dynsrc&#x0D;&#x0A;mkmzdyn.bat $(ConfigurationName)&#x0D;&#x0A;cd ..\..\worksp\racket&#x0D;&#x0A;&#x0D;&#x0A;"
 			/>
 		</Configuration>
 		<Configuration
-			Name="SGC|x64"
+			Name="SRelease|x64"
 			OutputDirectory="..\..\.."
 			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="1"
@@ -302,7 +419,7 @@
 				EnableIntrinsicFunctions="true"
 				FavorSizeOrSpeed="1"
 				AdditionalIncludeDirectories="..,..\..\racket\include,$(NOINHERIT)"
-				PreprocessorDefinitions="WIN32,NDEBUG,_CONSOLE,GC_DLL,_CRT_SECURE_NO_DEPRECATE"
+				PreprocessorDefinitions="WIN32,NDEBUG,_CONSOLE,GC_DLL,_CRT_SECURE_NO_DEPRECATE,USE_SENORA_GC"
 				StringPooling="true"
 				RuntimeLibrary="0"
 				EnableFunctionLevelLinking="true"
@@ -334,7 +451,7 @@
 			/>
 			<Tool
 				Name="VCPostBuildEventTool"
-				CommandLine="&#x0D;&#x0A;if exist &quot;$(TargetPath)&quot; goto :MzOK&#x0D;&#x0A;echo Error: did not find $(TargetPath)&#x0D;&#x0A;exit 1&#x0D;&#x0A;:MzOK&#x0D;&#x0A;&quot;$(TargetPath)&quot; -cu ..\..\racket\mkincludes.rkt &quot;$(TargetDir)/include/&quot; ..\..\racket ..&#x0D;&#x0A;if errorlevel 1 exit 1&#x0D;&#x0A;cd ..\..\racket\dynsrc&#x0D;&#x0A;mkmzdyn.bat&#x0D;&#x0A;cd ..\..\worksp\racket&#x0D;&#x0A;&#x0D;&#x0A;"
+				CommandLine="&#x0D;&#x0A;if exist &quot;$(TargetPath)&quot; goto :MzOK&#x0D;&#x0A;echo Error: did not find $(TargetPath)&#x0D;&#x0A;exit 1&#x0D;&#x0A;:MzOK&#x0D;&#x0A;&quot;$(TargetPath)&quot; -cu ..\..\racket\mkincludes.rkt &quot;$(TargetDir)/include/&quot; ..\..\racket ..&#x0D;&#x0A;if errorlevel 1 exit 1&#x0D;&#x0A;cd ..\..\racket\dynsrc&#x0D;&#x0A;mkmzdyn.bat $(ConfigurationName)&#x0D;&#x0A;cd ..\..\worksp\racket&#x0D;&#x0A;&#x0D;&#x0A;"
 			/>
 		</Configuration>
 	</Configurations>
@@ -346,7 +463,7 @@
 			Filter="cpp;c;cxx;rc;def;r;odl;idl;hpj;bat;for;f90"
 			>
 			<File
-				RelativePath="..\..\Racket\Main.c"
+				RelativePath="..\..\racket\main.c"
 				>
 			</File>
 			<File
diff --git a/racket/src/worksp/racket/racket.vcxproj b/racket/src/worksp/racket/racket.vcxproj
index 720f6246b3..db98f21222 100644
--- a/racket/src/worksp/racket/racket.vcxproj
+++ b/racket/src/worksp/racket/racket.vcxproj
@@ -1,28 +1,36 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup Label="ProjectConfigurations">
-    <ProjectConfiguration Include="Debug|Win32">
-      <Configuration>Debug</Configuration>
+    <ProjectConfiguration Include="BDebug|Win32">
+      <Configuration>BDebug</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
-    <ProjectConfiguration Include="Debug|x64">
-      <Configuration>Debug</Configuration>
+    <ProjectConfiguration Include="BDebug|x64">
+      <Configuration>BDebug</Configuration>
       <Platform>x64</Platform>
     </ProjectConfiguration>
-    <ProjectConfiguration Include="Release|Win32">
-      <Configuration>Release</Configuration>
+    <ProjectConfiguration Include="BRelease|Win32">
+      <Configuration>BRelease</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
-    <ProjectConfiguration Include="Release|x64">
-      <Configuration>Release</Configuration>
+    <ProjectConfiguration Include="BRelease|x64">
+      <Configuration>BRelease</Configuration>
       <Platform>x64</Platform>
     </ProjectConfiguration>
-    <ProjectConfiguration Include="SGC|Win32">
-      <Configuration>SGC</Configuration>
+    <ProjectConfiguration Include="SDebug|Win32">
+      <Configuration>SDebug</Configuration>
       <Platform>Win32</Platform>
     </ProjectConfiguration>
-    <ProjectConfiguration Include="SGC|x64">
-      <Configuration>SGC</Configuration>
+    <ProjectConfiguration Include="SDebug|x64">
+      <Configuration>SDebug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="SRelease|Win32">
+      <Configuration>SRelease</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="SRelease|x64">
+      <Configuration>SRelease</Configuration>
       <Platform>x64</Platform>
     </ProjectConfiguration>
   </ItemGroup>
@@ -30,32 +38,7 @@
     <ProjectGuid>{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}</ProjectGuid>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='SGC|Win32'" Label="Configuration">
-    <ConfigurationType>Application</ConfigurationType>
-    <UseOfMfc>false</UseOfMfc>
-    <CharacterSet>MultiByte</CharacterSet>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
-    <ConfigurationType>Application</ConfigurationType>
-    <UseOfMfc>false</UseOfMfc>
-    <CharacterSet>MultiByte</CharacterSet>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
-    <ConfigurationType>Application</ConfigurationType>
-    <UseOfMfc>false</UseOfMfc>
-    <CharacterSet>MultiByte</CharacterSet>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='SGC|x64'" Label="Configuration">
-    <ConfigurationType>Application</ConfigurationType>
-    <UseOfMfc>false</UseOfMfc>
-    <CharacterSet>MultiByte</CharacterSet>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
-    <ConfigurationType>Application</ConfigurationType>
-    <UseOfMfc>false</UseOfMfc>
-    <CharacterSet>MultiByte</CharacterSet>
-  </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
+  <PropertyGroup Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseOfMfc>false</UseOfMfc>
     <CharacterSet>MultiByte</CharacterSet>
@@ -63,27 +46,7 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='SGC|Win32'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-    <Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
-  </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-    <Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
-  </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-    <Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
-  </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='SGC|x64'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-    <Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
-  </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="PropertySheets">
-    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
-    <Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
-  </ImportGroup>
-  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="PropertySheets">
+  <ImportGroup Label="PropertySheets">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
     <Import Project="$(VCTargetsPath)Microsoft.CPP.UpgradeFromVC71.props" />
   </ImportGroup>
@@ -95,15 +58,10 @@
     <IntDir>$(Platform)\$(Configuration)\</IntDir>
     <LinkIncremental>false</LinkIncremental>
   </PropertyGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
+  <ItemDefinitionGroup>
     <ClCompile>
-      <Optimization>Disabled</Optimization>
       <AdditionalIncludeDirectories>..;..\..\racket\include</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;GC_DLL;_CRT_SECURE_NO_DEPRECATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
-      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
+      <PrecompiledHeader></PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
       <SuppressStartupBanner>true</SuppressStartupBanner>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
@@ -114,7 +72,7 @@
       <Culture>0x0409</Culture>
     </ResourceCompile>
     <Link>
-      <AdditionalOptions>/MACHINE:I386 /DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll %(AdditionalOptions)</AdditionalOptions>
+      <AdditionalOptions>/DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll %(AdditionalOptions)</AdditionalOptions>
       <AdditionalDependencies>delayimp.lib;user32.lib;%(AdditionalDependencies)</AdditionalDependencies>
       <OutputFile>..\..\..\RacketCGC.exe</OutputFile>
       <SuppressStartupBanner>true</SuppressStartupBanner>
@@ -135,259 +93,102 @@ exit 1
 "$(TargetPath)" -cu ..\..\racket\mkincludes.rkt "$(TargetDir)/include/" ..\..\racket ..
 if errorlevel 1 exit 1
 cd ..\..\racket\dynsrc
-mkmzdynd.bat
+mkmzdyn.bat $(Configuration)
 cd ..\..\worksp\racket
 
 </Command>
     </PostBuildEvent>
   </ItemDefinitionGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='BDebug|Win32'">
+    <ClCompile>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;GC_DLL;_CRT_SECURE_NO_DEPRECATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
+    </ClCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='BDebug|x64'">
     <ClCompile>
       <Optimization>Disabled</Optimization>
-      <AdditionalIncludeDirectories>..;..\..\racket\include</AdditionalIncludeDirectories>
       <PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;GC_DLL;_CRT_SECURE_NO_DEPRECATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
       <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <CompileAs>Default</CompileAs>
     </ClCompile>
-    <ResourceCompile>
-      <PreprocessorDefinitions>_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <Culture>0x0409</Culture>
-    </ResourceCompile>
     <Link>
-      <AdditionalOptions>/MACHINE:X64 /DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll %(AdditionalOptions)</AdditionalOptions>
-      <AdditionalDependencies>delayimp.lib;user32.lib;%(AdditionalDependencies)</AdditionalDependencies>
-      <OutputFile>..\..\..\RacketCGC.exe</OutputFile>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <ProgramDatabaseFile>..\..\..\RacketCGC.pdb</ProgramDatabaseFile>
-      <SubSystem>Console</SubSystem>
-      <StackReserveSize>8388608</StackReserveSize>
-      <RandomizedBaseAddress>false</RandomizedBaseAddress>
-      <DataExecutionPrevention>
-      </DataExecutionPrevention>
       <TargetMachine>MachineX64</TargetMachine>
     </Link>
-    <PostBuildEvent>
-      <Command>
-if exist "$(TargetPath)" goto :MzOK
-echo Error: did not find $(TargetPath)
-exit 1
-:MzOK
-"$(TargetPath)" -cu ..\..\racket\mkincludes.rkt "$(TargetDir)/include/" ..\..\racket ..
-if errorlevel 1 exit 1
-cd ..\..\racket\dynsrc
-mkmzdynd.bat
-cd ..\..\worksp\racket
-
-</Command>
-    </PostBuildEvent>
   </ItemDefinitionGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='BRelease|Win32'">
     <ClCompile>
       <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
-      <AdditionalIncludeDirectories>..;..\..\racket\include</AdditionalIncludeDirectories>
       <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;GC_DLL;_CRT_SECURE_NO_DEPRECATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <StringPooling>true</StringPooling>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <FunctionLevelLinking>true</FunctionLevelLinking>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <CompileAs>Default</CompileAs>
     </ClCompile>
-    <ResourceCompile>
-      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <Culture>0x0409</Culture>
-    </ResourceCompile>
-    <Link>
-      <AdditionalOptions>/MACHINE:I386 /DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll %(AdditionalOptions)</AdditionalOptions>
-      <AdditionalDependencies>delayimp.lib;user32.lib;%(AdditionalDependencies)</AdditionalDependencies>
-      <OutputFile>..\..\..\RacketCGC.exe</OutputFile>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <ProgramDatabaseFile>..\..\..\RacketCGC.pdb</ProgramDatabaseFile>
-      <SubSystem>Console</SubSystem>
-      <StackReserveSize>8388608</StackReserveSize>
-      <RandomizedBaseAddress>false</RandomizedBaseAddress>
-      <DataExecutionPrevention>
-      </DataExecutionPrevention>
-    </Link>
-    <PostBuildEvent>
-      <Command>
-if exist "$(TargetPath)" goto :MzOK
-echo Error: did not find $(TargetPath)
-exit 1
-:MzOK
-"$(TargetPath)" -cu ..\..\racket\mkincludes.rkt "$(TargetDir)/include/" ..\..\racket ..
-if errorlevel 1 exit 1
-cd ..\..\racket\dynsrc
-mkmzdyn.bat
-cd ..\..\worksp\racket
-
-</Command>
-    </PostBuildEvent>
   </ItemDefinitionGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='BRelease|x64'">
     <ClCompile>
       <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
-      <AdditionalIncludeDirectories>..;..\..\racket\include</AdditionalIncludeDirectories>
       <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;GC_DLL;_CRT_SECURE_NO_DEPRECATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <StringPooling>true</StringPooling>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <FunctionLevelLinking>true</FunctionLevelLinking>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <CompileAs>Default</CompileAs>
     </ClCompile>
-    <ResourceCompile>
-      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <Culture>0x0409</Culture>
-    </ResourceCompile>
     <Link>
-      <AdditionalOptions> /DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll %(AdditionalOptions)</AdditionalOptions>
-      <AdditionalDependencies>delayimp.lib;user32.lib;%(AdditionalDependencies)</AdditionalDependencies>
-      <OutputFile>..\..\..\RacketCGC.exe</OutputFile>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <ProgramDatabaseFile>..\..\..\RacketCGC.pdb</ProgramDatabaseFile>
-      <SubSystem>Console</SubSystem>
-      <StackReserveSize>8388608</StackReserveSize>
-      <RandomizedBaseAddress>false</RandomizedBaseAddress>
-      <DataExecutionPrevention>
-      </DataExecutionPrevention>
       <TargetMachine>MachineX64</TargetMachine>
     </Link>
-    <PostBuildEvent>
-      <Command>
-if exist "$(TargetPath)" goto :MzOK
-echo Error: did not find $(TargetPath)
-exit 1
-:MzOK
-"$(TargetPath)" -cu ..\..\racket\mkincludes.rkt "$(TargetDir)/include/" ..\..\racket ..
-if errorlevel 1 exit 1
-cd ..\..\racket\dynsrc
-mkmzdyn.bat
-cd ..\..\worksp\racket
-
-</Command>
-    </PostBuildEvent>
   </ItemDefinitionGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='SGC|Win32'">
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='SDebug|Win32'">
     <ClCompile>
-      <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
-      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
-      <AdditionalIncludeDirectories>..;..\..\racket\include</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;GC_DLL;_CRT_SECURE_NO_DEPRECATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <StringPooling>true</StringPooling>
-      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
-      <FunctionLevelLinking>true</FunctionLevelLinking>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <CompileAs>Default</CompileAs>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;GC_DLL;_CRT_SECURE_NO_DEPRECATE;USE_SENORA_GC;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
     </ClCompile>
-    <ResourceCompile>
-      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <Culture>0x0409</Culture>
-    </ResourceCompile>
-    <Link>
-      <AdditionalOptions>/MACHINE:I386 /DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll %(AdditionalOptions)</AdditionalOptions>
-      <AdditionalDependencies>delayimp.lib;user32.lib;%(AdditionalDependencies)</AdditionalDependencies>
-      <OutputFile>..\..\..\RacketCGC.exe</OutputFile>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <ProgramDatabaseFile>..\..\..\RacketCGC.pdb</ProgramDatabaseFile>
-      <SubSystem>Console</SubSystem>
-      <StackReserveSize>8388608</StackReserveSize>
-      <RandomizedBaseAddress>false</RandomizedBaseAddress>
-      <DataExecutionPrevention>
-      </DataExecutionPrevention>
-    </Link>
-    <PostBuildEvent>
-      <Command>
-if exist "$(TargetPath)" goto :MzOK
-echo Error: did not find $(TargetPath)
-exit 1
-:MzOK
-"$(TargetPath)" -cu ..\..\racket\mkincludes.rkt "$(TargetDir)/include/" ..\..\racket ..
-if errorlevel 1 exit 1
-cd ..\..\racket\dynsrc
-mkmzdyn.bat
-cd ..\..\worksp\racket
-
-</Command>
-    </PostBuildEvent>
   </ItemDefinitionGroup>
-  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='SGC|x64'">
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='SDebug|x64'">
     <ClCompile>
-      <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
-      <IntrinsicFunctions>true</IntrinsicFunctions>
-      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
-      <AdditionalIncludeDirectories>..;..\..\racket\include</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;GC_DLL;_CRT_SECURE_NO_DEPRECATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <StringPooling>true</StringPooling>
-      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
-      <FunctionLevelLinking>true</FunctionLevelLinking>
-      <PrecompiledHeader>
-      </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <CompileAs>Default</CompileAs>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;GC_DLL;_CRT_SECURE_NO_DEPRECATE;USE_SENORA_GC;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
+    </ClCompile>
+    <Link>
+      <TargetMachine>MachineX64</TargetMachine>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='SRelease|Win32'">
+    <ClCompile>
+      <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;GC_DLL;_CRT_SECURE_NO_DEPRECATE;USE_SENORA_GC;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+    </ClCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='SRelease|x64'">
+    <ClCompile>
+      <InlineFunctionExpansion>AnySuitable</InlineFunctionExpansion>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;GC_DLL;_CRT_SECURE_NO_DEPRECATE;USE_SENORA_GC;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <StringPooling>true</StringPooling>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
     </ClCompile>
-    <ResourceCompile>
-      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
-      <Culture>0x0409</Culture>
-    </ResourceCompile>
     <Link>
-      <AdditionalOptions> /DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll %(AdditionalOptions)</AdditionalOptions>
-      <AdditionalDependencies>delayimp.lib;user32.lib;%(AdditionalDependencies)</AdditionalDependencies>
-      <OutputFile>..\..\..\RacketCGC.exe</OutputFile>
-      <SuppressStartupBanner>true</SuppressStartupBanner>
-      <GenerateDebugInformation>true</GenerateDebugInformation>
-      <ProgramDatabaseFile>..\..\..\RacketCGC.pdb</ProgramDatabaseFile>
-      <SubSystem>Console</SubSystem>
-      <StackReserveSize>8388608</StackReserveSize>
-      <RandomizedBaseAddress>false</RandomizedBaseAddress>
-      <DataExecutionPrevention>
-      </DataExecutionPrevention>
       <TargetMachine>MachineX64</TargetMachine>
     </Link>
-    <PostBuildEvent>
-      <Command>
-if exist "$(TargetPath)" goto :MzOK
-echo Error: did not find $(TargetPath)
-exit 1
-:MzOK
-"$(TargetPath)" -cu ..\..\racket\mkincludes.rkt "$(TargetDir)/include/" ..\..\racket ..
-if errorlevel 1 exit 1
-cd ..\..\racket\dynsrc
-mkmzdyn.bat
-cd ..\..\worksp\racket
-
-</Command>
-    </PostBuildEvent>
   </ItemDefinitionGroup>
   <ItemGroup>
-    <ClCompile Include="..\..\Racket\Main.c" />
+    <ClCompile Include="..\..\racket\main.c" />
   </ItemGroup>
   <ItemGroup>
     <ResourceCompile Include="racket.rc" />
diff --git a/racket/src/worksp/racket/racket9.sln b/racket/src/worksp/racket/racket9.sln
index 43aa499ff4..1bbb44a770 100644
--- a/racket/src/worksp/racket/racket9.sln
+++ b/racket/src/worksp/racket/racket9.sln
@@ -3,6 +3,7 @@ Microsoft Visual Studio Solution File, Format Version 10.00
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Racket", "racket.vcproj", "{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}"
 	ProjectSection(ProjectDependencies) = postProject
 		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90} = {A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F} = {66548E7B-294E-40EF-B7C0-C8D6D7E6234F}
 		{8128F0AE-848A-4985-945A-568796A6DDD7} = {8128F0AE-848A-4985-945A-568796A6DDD7}
 	EndProjectSection
 EndProject
@@ -25,44 +26,56 @@ Global
 		Debug|x64 = Debug|x64
 		Release|Win32 = Release|Win32
 		Release|x64 = Release|x64
-		SGC|Win32 = SGC|Win32
-		SGC|x64 = SGC|x64
+		AltGCDebug|Win32 = AltGCDebug|Win32
+		AltGCDebug|x64 = AltGCDebug|x64
+		AltGCRelease|Win32 = AltGCRelease|Win32
+		AltGCRelease|x64 = AltGCRelease|x64
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Debug|Win32.ActiveCfg = Debug|Win32
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Debug|Win32.Build.0 = Debug|Win32
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Debug|x64.ActiveCfg = Debug|x64
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Debug|x64.Build.0 = Debug|x64
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Release|Win32.ActiveCfg = Release|Win32
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Release|Win32.Build.0 = Release|Win32
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Release|x64.ActiveCfg = Release|x64
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Release|x64.Build.0 = Release|x64
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.SGC|Win32.ActiveCfg = SGC|Win32
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.SGC|Win32.Build.0 = SGC|Win32
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.SGC|x64.ActiveCfg = SGC|x64
-		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.SGC|x64.Build.0 = SGC|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|Win32.ActiveCfg = Debug|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|Win32.Build.0 = Debug|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|x64.ActiveCfg = Debug|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|x64.Build.0 = Debug|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|Win32.ActiveCfg = Release|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|Win32.Build.0 = Release|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|x64.ActiveCfg = Release|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|x64.Build.0 = Release|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.SGC|Win32.ActiveCfg = SGC|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.SGC|Win32.Build.0 = SGC|Win32
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.SGC|x64.ActiveCfg = SGC|x64
-		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.SGC|x64.Build.0 = SGC|x64
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Debug|Win32.ActiveCfg = SDebug|Win32
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Debug|Win32.Build.0 = SDebug|Win32
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Debug|x64.ActiveCfg = SDebug|x64
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Debug|x64.Build.0 = SDebug|x64
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Release|Win32.ActiveCfg = SRelease|Win32
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Release|Win32.Build.0 = SRelease|Win32
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Release|x64.ActiveCfg = SRelease|x64
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.Release|x64.Build.0 = SRelease|x64
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.AltGCDebug|Win32.ActiveCfg = BDebug|Win32
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.AltGCDebug|Win32.Build.0 = BDebug|Win32
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.AltGCDebug|x64.ActiveCfg = BDebug|x64
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.AltGCDebug|x64.Build.0 = BDebug|x64
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.AltGCRelease|Win32.ActiveCfg = BRelease|Win32
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.AltGCRelease|Win32.Build.0 = BRelease|Win32
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.AltGCRelease|x64.ActiveCfg = BRelease|x64
+		{EB7023C8-6D72-4DE4-ADFC-3913C4C70991}.AltGCRelease|x64.Build.0 = BRelease|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|Win32.ActiveCfg = SDebug|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|Win32.Build.0 = SDebug|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|x64.ActiveCfg = SDebug|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Debug|x64.Build.0 = SDebug|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|Win32.ActiveCfg = SRelease|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|Win32.Build.0 = SRelease|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|x64.ActiveCfg = SRelease|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.Release|x64.Build.0 = SRelease|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCDebug|Win32.ActiveCfg = BDebug|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCDebug|Win32.Build.0 = BDebug|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCDebug|x64.ActiveCfg = BDebug|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCDebug|x64.Build.0 = BDebug|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCRelease|Win32.ActiveCfg = BRelease|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCRelease|Win32.Build.0 = BRelease|Win32
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCRelease|x64.ActiveCfg = BRelease|x64
+		{A6713577-7DFB-48F8-B8C1-7DB2D7C51F90}.AltGCRelease|x64.Build.0 = BRelease|x64
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|Win32.ActiveCfg = Debug|Win32
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|Win32.Build.0 = Debug|Win32
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|x64.ActiveCfg = Debug|x64
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Debug|x64.Build.0 = Debug|x64
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|Win32.ActiveCfg = Release|Win32
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|Win32.Build.0 = Release|Win32
 		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|x64.ActiveCfg = Release|x64
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.Release|x64.Build.0 = Release|x64
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.SGC|Win32.ActiveCfg = SGC|Win32
-		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.SGC|x64.ActiveCfg = SGC|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|Win32.ActiveCfg = Debug|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|Win32.Build.0 = Debug|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|x64.ActiveCfg = Debug|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCDebug|x64.Build.0 = Debug|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|Win32.ActiveCfg = Release|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|Win32.Build.0 = Release|Win32
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|x64.ActiveCfg = Release|x64
+		{66548E7B-294E-40EF-B7C0-C8D6D7E6234F}.AltGCRelease|x64.Build.0 = Release|x64
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Debug|Win32.ActiveCfg = Debug|Win32
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Debug|Win32.Build.0 = Debug|Win32
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Debug|x64.ActiveCfg = Debug|x64
@@ -71,18 +84,26 @@ Global
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Release|Win32.Build.0 = Release|Win32
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Release|x64.ActiveCfg = Release|x64
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.Release|x64.Build.0 = Release|x64
-		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.SGC|Win32.ActiveCfg = SGC|Win32
-		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.SGC|Win32.Build.0 = SGC|Win32
-		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.SGC|x64.ActiveCfg = SGC|x64
-		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.SGC|x64.Build.0 = SGC|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|Win32.ActiveCfg = Debug|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|Win32.Build.0 = Debug|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|x64.ActiveCfg = Debug|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCDebug|x64.Build.0 = Debug|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|Win32.ActiveCfg = Release|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|Win32.Build.0 = Release|Win32
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|x64.ActiveCfg = Release|x64
+		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.AltGCRelease|x64.Build.0 = Release|x64
 		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|Win32.ActiveCfg = Debug|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|Win32.Build.0 = Debug|Win32
 		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|x64.ActiveCfg = Debug|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|x64.Build.0 = Debug|x64
 		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|Win32.ActiveCfg = Release|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|Win32.Build.0 = Release|Win32
 		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|x64.ActiveCfg = Release|x64
-		{8128F0AE-848A-4985-945A-568796A6DDD7}.SGC|Win32.ActiveCfg = Release|Win32
-		{8128F0AE-848A-4985-945A-568796A6DDD7}.SGC|Win32.Build.0 = Release|Win32
-		{8128F0AE-848A-4985-945A-568796A6DDD7}.SGC|x64.ActiveCfg = Release|x64
-		{8128F0AE-848A-4985-945A-568796A6DDD7}.SGC|x64.Build.0 = Release|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|x64.Build.0 = Release|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCDebug|Win32.ActiveCfg = Debug|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCDebug|x64.ActiveCfg = Debug|x64
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCRelease|Win32.ActiveCfg = Release|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.AltGCRelease|x64.ActiveCfg = Release|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/racket/src/worksp/sgc/sgc.vcproj b/racket/src/worksp/sgc/sgc.vcproj
index 624671c08f..25bcb9fd2b 100644
--- a/racket/src/worksp/sgc/sgc.vcproj
+++ b/racket/src/worksp/sgc/sgc.vcproj
@@ -22,7 +22,7 @@
 		<Configuration
 			Name="Debug|Win32"
 			OutputDirectory="..\..\..\lib"
-			IntermediateDirectory="$(ConfigurationName)"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="2"
 			CharacterSet="1"
 			>
@@ -78,7 +78,7 @@
 		<Configuration
 			Name="Release|Win32"
 			OutputDirectory="..\..\..\lib"
-			IntermediateDirectory="$(ConfigurationName)"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
 			ConfigurationType="2"
 			CharacterSet="1"
 			WholeProgramOptimization="1"
@@ -88,7 +88,7 @@
 				Optimization="0"
 				EnableIntrinsicFunctions="true"
 				AdditionalIncludeDirectories=".."
-				PreprocessorDefinitions="WIN32;NDEBUG;_WINDOWS;_USRDLL;SGC_EXPORTS;SGC_STD_DEBUGGING=1"
+				PreprocessorDefinitions="WIN32;NDEBUG;_WINDOWS;_USRDLL;SGC_EXPORTS"
 				RuntimeLibrary="2"
 				EnableFunctionLevelLinking="true"
 				UsePrecompiledHeader="0"
@@ -120,7 +120,7 @@
 				Optimization="0"
 				EnableIntrinsicFunctions="true"
 				AdditionalIncludeDirectories=".."
-				PreprocessorDefinitions="WIN32;NDEBUG;_WINDOWS;_USRDLL;SGC_EXPORTS;SGC_STD_DEBUGGING=1"
+				PreprocessorDefinitions="WIN32;NDEBUG;_WINDOWS;_USRDLL;SGC_EXPORTS"
 				RuntimeLibrary="2"
 				EnableFunctionLevelLinking="true"
 				UsePrecompiledHeader="0"
diff --git a/racket/src/worksp/sgc/sgc.vcxproj b/racket/src/worksp/sgc/sgc.vcxproj
index 18b62b4198..c695318336 100644
--- a/racket/src/worksp/sgc/sgc.vcxproj
+++ b/racket/src/worksp/sgc/sgc.vcxproj
@@ -107,7 +107,7 @@
       <Optimization>Disabled</Optimization>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <AdditionalIncludeDirectories>..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;SGC_EXPORTS;SGC_STD_DEBUGGING=1;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;SGC_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <PrecompiledHeader>
@@ -130,7 +130,7 @@
       <Optimization>Disabled</Optimization>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <AdditionalIncludeDirectories>..;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;SGC_EXPORTS;SGC_STD_DEBUGGING=1;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;SGC_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <PrecompiledHeader>