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Thomas,
As I've just got my own build environment set up with the
free MS compiler, I thought I'd show off and build my own
copy :-)

I can confirm that with the patch, the pywin32 installer
also works (the one real-life case of a preinstall script
that I know).

Also, this patch fixes another funny issue I'd not quite
managed to isolate - installers were failing to compile .py
files (and conversely, the uninstaller was leaving .pyc
files behind).

Paul.