Properly filter some recent additions in the Windows build files.

PCbuild/_overlapped.vcxproj.filters

+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Source Files">
+      <UniqueIdentifier>{6f67c8db-7de7-4714-a967-2b0d4bc71f2e}</UniqueIdentifier>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="..\Modules\overlapped.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+</Project>
\ No newline at end of file

PCbuild/_sha3.vcxproj.filters

+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Source Files">
+      <UniqueIdentifier>{f1f1fd19-4f85-4a56-be41-af14f0bc2a9c}</UniqueIdentifier>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="..\Modules\_sha3\sha3module.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+</Project>
\ No newline at end of file

PCbuild/pythoncore.vcxproj.filters

@@ -414,7 +414,6 @@
     <ClInclude Include="..\Python\thread_nt.h">
       <Filter>Python</Filter>
     </ClInclude>
-    <ClInclude Include="..\Include\namespaceobject.h" />
     <ClInclude Include="..\Python\condvar.h">
       <Filter>Python</Filter>
     </ClInclude>
@@ -424,6 +423,12 @@
     <ClInclude Include="..\Include\pyhash.h">
       <Filter>Include</Filter>
     </ClInclude>
+    <ClInclude Include="..\Include\namespaceobject.h">
+      <Filter>Include</Filter>
+    </ClInclude>
+    <ClInclude Include="..\Modules\hashtable.h">
+      <Filter>Modules</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="..\Modules\_bisectmodule.c">
@@ -930,13 +935,24 @@
     <ClCompile Include="..\Modules\_winapi.c">
       <Filter>PC</Filter>
     </ClCompile>
-    <ClCompile Include="..\Objects\namespaceobject.c" />
     <ClCompile Include="..\Modules\_stat.c">
       <Filter>Modules</Filter>
     </ClCompile>
     <ClCompile Include="..\Python\pyhash.c">
       <Filter>Python</Filter>
     </ClCompile>
+    <ClCompile Include="..\Objects\namespaceobject.c">
+      <Filter>Objects</Filter>
+    </ClCompile>
+    <ClCompile Include="..\Modules\_opcode.c">
+      <Filter>Modules</Filter>
+    </ClCompile>
+    <ClCompile Include="..\Modules\_tracemalloc.c">
+      <Filter>Modules</Filter>
+    </ClCompile>
+    <ClCompile Include="..\Modules\hashtable.c">
+      <Filter>Modules</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ResourceCompile Include="..\PC\python_nt.rc">