diff --git a/src/racket/sgc/sgc.c b/src/racket/sgc/sgc.c
index 1fbf8607d1..3c2692d4b4 100644
--- a/src/racket/sgc/sgc.c
+++ b/src/racket/sgc/sgc.c
@@ -35,6 +35,11 @@
 #include "mzconfig.h"
 #include "sgc.h"
 
+#ifdef _WIN64
+# define SIZEOF_LONG 8
+# define inline _inline
+#endif
+
 #ifdef SIZEOF_LONG
 # if SIZEOF_LONG == 8
 #  define SIXTY_FOUR_BIT_INTEGERS
diff --git a/src/worksp/libffi/libffi.vcproj b/src/worksp/libffi/libffi.vcproj
index f4c957ad47..e378bf3c70 100644
--- a/src/worksp/libffi/libffi.vcproj
+++ b/src/worksp/libffi/libffi.vcproj
@@ -48,7 +48,7 @@
 				PreprocessorDefinitions="WIN32;_DEBUG;_LIB"
 				MinimalRebuild="true"
 				BasicRuntimeChecks="3"
-				RuntimeLibrary="3"
+				RuntimeLibrary="1"
 				UsePrecompiledHeader="0"
 				WarningLevel="3"
 				DebugInformationFormat="4"
@@ -111,7 +111,7 @@
 				PreprocessorDefinitions="WIN32;_DEBUG;_LIB"
 				MinimalRebuild="true"
 				BasicRuntimeChecks="3"
-				RuntimeLibrary="3"
+				RuntimeLibrary="1"
 				UsePrecompiledHeader="0"
 				WarningLevel="3"
 				DebugInformationFormat="3"
diff --git a/src/worksp/libmzgc/libmzgc.vcproj b/src/worksp/libmzgc/libmzgc.vcproj
index e2cb0b1fd5..b1c654a59e 100644
--- a/src/worksp/libmzgc/libmzgc.vcproj
+++ b/src/worksp/libmzgc/libmzgc.vcproj
@@ -151,7 +151,7 @@
 			/>
 			<Tool
 				Name="VCLinkerTool"
-				AdditionalOptions="/MACHINE:I386"
+				AdditionalOptions="/MACHINE:X64"
 				AdditionalDependencies="User32.lib"
 				OutputFile="..\..\..\lib\$(ProjectName)xxxxxxx.dll"
 				SuppressStartupBanner="true"
diff --git a/src/worksp/libracket/libracket.vcproj b/src/worksp/libracket/libracket.vcproj
index 2180bd1eb2..fc9c0fc89e 100644
--- a/src/worksp/libracket/libracket.vcproj
+++ b/src/worksp/libracket/libracket.vcproj
@@ -154,7 +154,7 @@
 			/>
 			<Tool
 				Name="VCLinkerTool"
-				AdditionalOptions="/MACHINE:I386"
+				AdditionalOptions="/MACHINE:X64"
 				AdditionalDependencies="WS2_32.lib Shell32.lib User32.lib"
 				OutputFile="..\..\..\lib\libracketxxxxxxx.dll"
 				SuppressStartupBanner="true"
@@ -482,7 +482,7 @@
 				EnableIntrinsicFunctions="true"
 				FavorSizeOrSpeed="1"
 				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"
+				PreprocessorDefinitions="WIN32;NDEBUG;_WINDOWS;_USRDLL;GC_DLL;__STDC__;LIBMZ_EXPORTS;_CRT_SECURE_NO_DEPRECATE;USE_SENORA_GC;SGC_STD_DEBUGGING=1"
 				StringPooling="true"
 				RuntimeLibrary="0"
 				EnableFunctionLevelLinking="true"
diff --git a/src/worksp/racket/racket.sln b/src/worksp/racket/racket.sln
index 55e38e7cf2..cd9f2450ce 100644
--- a/src/worksp/racket/racket.sln
+++ b/src/worksp/racket/racket.sln
@@ -9,6 +9,7 @@ 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
@@ -75,13 +76,13 @@ Global
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.SGC|x64.ActiveCfg = SGC|x64
 		{7DB29F1E-06FD-4E39-97FF-1C7922F6901A}.SGC|x64.Build.0 = SGC|x64
 		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|Win32.ActiveCfg = Debug|Win32
-		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|x64.ActiveCfg = Debug|Win32
+		{8128F0AE-848A-4985-945A-568796A6DDD7}.Debug|x64.ActiveCfg = Debug|x64
 		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|Win32.ActiveCfg = Release|Win32
-		{8128F0AE-848A-4985-945A-568796A6DDD7}.Release|x64.ActiveCfg = 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|Win32
-		{8128F0AE-848A-4985-945A-568796A6DDD7}.SGC|x64.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
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
diff --git a/src/worksp/racket/racket.vcproj b/src/worksp/racket/racket.vcproj
index 6af2e8362c..77cdc6e614 100644
--- a/src/worksp/racket/racket.vcproj
+++ b/src/worksp/racket/racket.vcproj
@@ -154,7 +154,7 @@
 			/>
 			<Tool
 				Name="VCLinkerTool"
-				AdditionalOptions="/MACHINE:I386 /DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll"
+				AdditionalOptions="/MACHINE:X64 /DELAYLOAD:libracketxxxxxxx.dll /DELAYLOAD:libmzgcxxxxxxx.dll"
 				AdditionalDependencies="delayimp.lib user32.lib"
 				OutputFile="..\..\..\RacketCGC.exe"
 				SuppressStartupBanner="true"
diff --git a/src/worksp/sgc/sgc.vcproj b/src/worksp/sgc/sgc.vcproj
index 6bd3828944..0f651efefb 100644
--- a/src/worksp/sgc/sgc.vcproj
+++ b/src/worksp/sgc/sgc.vcproj
@@ -12,6 +12,9 @@
 		<Platform
 			Name="Win32"
 		/>
+		<Platform
+			Name="x64"
+		/>
 	</Platforms>
 	<ToolFiles>
 	</ToolFiles>
@@ -60,9 +63,11 @@
 			/>
 			<Tool
 				Name="VCLinkerTool"
+				OutputFile="..\..\..\lib\libmzgcxxxxxxx.dll"
 				LinkIncremental="2"
 				GenerateDebugInformation="true"
 				SubSystem="2"
+				ImportLibrary="..\..\..\lib\msvc\libmzgcxxxxxxx.lib"
 				TargetMachine="1"
 			/>
 			<Tool
@@ -87,6 +92,80 @@
 				Name="VCPostBuildEventTool"
 			/>
 		</Configuration>
+		<Configuration
+			Name="Debug|x64"
+			OutputDirectory="$(SolutionDir)$(PlatformName)\$(ConfigurationName)"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
+			ConfigurationType="2"
+			CharacterSet="1"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="3"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				PreprocessorDefinitions="WIN32;_DEBUG;_WINDOWS;_USRDLL;SGC_EXPORTS"
+				MinimalRebuild="true"
+				BasicRuntimeChecks="3"
+				RuntimeLibrary="3"
+				UsePrecompiledHeader="2"
+				WarningLevel="3"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="..\..\..\lib\libmzgcxxxxxxx.dll"
+				LinkIncremental="2"
+				GenerateDebugInformation="true"
+				SubSystem="2"
+				ImportLibrary="..\..\..\lib\msvc\libmzgcxxxxxxx.lib"
+				TargetMachine="17"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
 		<Configuration
 			Name="Release|Win32"
 			OutputDirectory="$(SolutionDir)$(ConfigurationName)"
@@ -164,6 +243,84 @@
 				Name="VCPostBuildEventTool"
 			/>
 		</Configuration>
+		<Configuration
+			Name="Release|x64"
+			OutputDirectory="$(SolutionDir)$(PlatformName)\$(ConfigurationName)"
+			IntermediateDirectory="$(PlatformName)\$(ConfigurationName)"
+			ConfigurationType="2"
+			CharacterSet="1"
+			WholeProgramOptimization="1"
+			>
+			<Tool
+				Name="VCPreBuildEventTool"
+			/>
+			<Tool
+				Name="VCCustomBuildTool"
+			/>
+			<Tool
+				Name="VCXMLDataGeneratorTool"
+			/>
+			<Tool
+				Name="VCWebServiceProxyGeneratorTool"
+			/>
+			<Tool
+				Name="VCMIDLTool"
+				TargetEnvironment="3"
+			/>
+			<Tool
+				Name="VCCLCompilerTool"
+				Optimization="0"
+				EnableIntrinsicFunctions="true"
+				AdditionalIncludeDirectories=".."
+				PreprocessorDefinitions="WIN32;NDEBUG;_WINDOWS;_USRDLL;SGC_EXPORTS;SGC_STD_DEBUGGING=1"
+				RuntimeLibrary="2"
+				EnableFunctionLevelLinking="true"
+				UsePrecompiledHeader="0"
+				WarningLevel="3"
+				DebugInformationFormat="3"
+			/>
+			<Tool
+				Name="VCManagedResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCResourceCompilerTool"
+			/>
+			<Tool
+				Name="VCPreLinkEventTool"
+			/>
+			<Tool
+				Name="VCLinkerTool"
+				OutputFile="..\..\..\lib\libmzgcxxxxxxx.dll"
+				LinkIncremental="1"
+				GenerateDebugInformation="true"
+				SubSystem="2"
+				OptimizeReferences="2"
+				EnableCOMDATFolding="2"
+				ImportLibrary="..\..\..\lib\msvc\libmzgcxxxxxxx.lib"
+				TargetMachine="17"
+			/>
+			<Tool
+				Name="VCALinkTool"
+			/>
+			<Tool
+				Name="VCManifestTool"
+			/>
+			<Tool
+				Name="VCXDCMakeTool"
+			/>
+			<Tool
+				Name="VCBscMakeTool"
+			/>
+			<Tool
+				Name="VCFxCopTool"
+			/>
+			<Tool
+				Name="VCAppVerifierTool"
+			/>
+			<Tool
+				Name="VCPostBuildEventTool"
+			/>
+		</Configuration>
 	</Configurations>
 	<References>
 	</References>