Issue #28402: Adds signed catalog files for stdlib on Windows.
diff --git a/Tools/msi/lib/lib.wixproj b/Tools/msi/lib/lib.wixproj
index 64e5878..26311ea 100644
--- a/Tools/msi/lib/lib.wixproj
+++ b/Tools/msi/lib/lib.wixproj
@@ -27,6 +27,7 @@
             <TargetBase>$(PySourcePath)Lib</TargetBase>
             <Target_>Lib\</Target_>
             <Group>lib_py</Group>
+            <IncludeInCat>true</IncludeInCat>
         </InstallFiles>
     </ItemGroup>