diff --git a/scripts/windows-build-tarball.ps1 b/scripts/windows-build-tarball.ps1
new file mode 100644
index 0000000..f2c6ed7
--- /dev/null
+++ b/scripts/windows-build-tarball.ps1
@@ -0,0 +1,13 @@
+# This script creates an archive of the VTK Python package build tree. It is
+# downloaded by the external module build scripts and used to build their
+# Python package on GitHub CI services.
+#
+# It is designed to be executed on the overload.kitware.com build system, and
+# it requires 7-Zip to installed at C:\7-Zip. The VTKPythonPackage
+# repository needs to be checked out at C:\P\VPP. It is invoked after running the
+# scripts/windows_build_wheels.py script.
+
+
+cd C:\P\
+Remove-Item VPP\dist\*
+C:\7-Zip\7z.exe a -r 'C:\P\VTKPythonBuilds-windows.zip' -w 'C:\P\VPP' -mem=AES256