Close #24508: Backport the 3.5 MSBuild project files.

The old project files move to PC/VS9.0 and remain supported.

VS2008 is still required to build 2.7; VS2010 (or later, plus Windows SDK 7.1)
is *also* required to use the new project files.
diff --git a/PCbuild/sqlite3.vcxproj.filters b/PCbuild/sqlite3.vcxproj.filters
new file mode 100644
index 0000000..2e0e8df
--- /dev/null
+++ b/PCbuild/sqlite3.vcxproj.filters
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Header Files">
+      <UniqueIdentifier>{ce5b649d-a6f7-4459-9425-c883795d79df}</UniqueIdentifier>
+    </Filter>
+    <Filter Include="Source Files">
+      <UniqueIdentifier>{0e842fe2-176b-4e83-9d1f-0ad13a859efd}</UniqueIdentifier>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="$(sqlite3Dir)\sqlite3.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+    <ClInclude Include="$(sqlite3Dir)\sqlite3ext.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="$(sqlite3Dir)\sqlite3.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+</Project>