diff --git a/collects/profile/analyzer.ss b/collects/profile/analyzer.rkt
similarity index 100%
rename from collects/profile/analyzer.ss
rename to collects/profile/analyzer.rkt
diff --git a/collects/profile/main.ss b/collects/profile/main.rkt
similarity index 100%
rename from collects/profile/main.ss
rename to collects/profile/main.rkt
diff --git a/collects/profile/render-graphviz.ss b/collects/profile/render-graphviz.rkt
similarity index 100%
rename from collects/profile/render-graphviz.ss
rename to collects/profile/render-graphviz.rkt
diff --git a/collects/profile/render-text.ss b/collects/profile/render-text.rkt
similarity index 100%
rename from collects/profile/render-text.ss
rename to collects/profile/render-text.rkt
diff --git a/collects/profile/sampler.ss b/collects/profile/sampler.rkt
similarity index 100%
rename from collects/profile/sampler.ss
rename to collects/profile/sampler.rkt
diff --git a/collects/profile/scribblings/analyzer.scrbl b/collects/profile/scribblings/analyzer.scrbl
index da5201b..2b8fbd7 100644
--- a/collects/profile/scribblings/analyzer.scrbl
+++ b/collects/profile/scribblings/analyzer.scrbl
@@ -51,7 +51,7 @@ Represents the analyzed profile result.
 @item{@scheme[thread-times] holds an association list mapping thread
   identifiers to cpu time for the corresponding threads.  As samples
   are collected, each thread that is observed is assigned a small
-  integer identifier.  These identifers are listed for each function
+  integer identifier.  These identifiers are listed for each function
   call, and the total time spent in each thread is in this field.}
 
 @item{@scheme[nodes] is a list of nodes representing all observed
@@ -65,7 +65,7 @@ Represents the analyzed profile result.
   constructed for every graph.  This node is used as the caller for
   all top-level function nodes and as the callee for all leaf nodes.
   It can therefore be used to start a scan of the call graph.  In
-  addition, the times associated with it's "callers and callees"
+  addition, the times associated with its "callers and callees"
   actually represent the time these functions spent being the root of
   the computation or its leaf.  (This can be different from a node's
   ``self'' time, since it is divided by the number of instances a
diff --git a/collects/profile/scribblings/info.ss b/collects/profile/scribblings/info.rkt
similarity index 100%
rename from collects/profile/scribblings/info.ss
rename to collects/profile/scribblings/info.rkt
diff --git a/collects/profile/scribblings/toplevel.scrbl b/collects/profile/scribblings/toplevel.scrbl
index 751af09..4beabcc 100644
--- a/collects/profile/scribblings/toplevel.scrbl
+++ b/collects/profile/scribblings/toplevel.scrbl
@@ -9,7 +9,7 @@
 
 @defmodule[profile]
 
-This module provides one procedure and one macroxs that are convenient
+This module provides one procedure and one macro that are convenient
 high-level entry points for timing expressions.  This hides the
 details that are available through other parts of the library, and is
 intended as a convenient tool for profiling code.
diff --git a/collects/profile/structs.ss b/collects/profile/structs.rkt
similarity index 100%
rename from collects/profile/structs.ss
rename to collects/profile/structs.rkt
diff --git a/collects/profile/utils.ss b/collects/profile/utils.rkt
similarity index 100%
rename from collects/profile/utils.ss
rename to collects/profile/utils.rkt
diff --git a/collects/tests/profile/main.ss b/collects/tests/profile/main.rkt
similarity index 100%
rename from collects/tests/profile/main.ss
rename to collects/tests/profile/main.rkt
diff --git a/collects/tests/profile/topsort.ss b/collects/tests/profile/topsort.rkt
similarity index 100%
rename from collects/tests/profile/topsort.ss
rename to collects/tests/profile/topsort.rkt