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Marking long hex values explicitely as a long with 'L' is a
core language feature. It is described in the Python
documentation here:
http://www.python.org/doc/current/ref/integers.html

So even without testing (I have no Windows available here ;)
I would say yes, this patch will work with win32 extension
installed.
And the same type of patch was applied to nearly all Python
modules using long hex values, for example in the msgfmt.py
tool.