[docs] [issue8557] subprocess PATH semantics and portability

[Dave Abrahams]

Dave Abrahams <dave at boostpro.com> added the comment:

I've uploaded a new probe.py that contains a win32 Popen wrapper that I think acts just like *nix's Popen w.r.t. PATH and environment (pass --fix to demonstrate).  I suggest using this or an equivalent wrapper for Win32, and documenting the fact that with shell=False, filename extensions need to be supplied explicitly on windows.

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Added file: http://bugs.python.org/file17180/probe.py

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