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In revision 62197, Mon Apr 7 01:53:39 2008 UTC, Mark Hammond added code
to Lib/distutils/command/bdist_wininst.py which was intended to select
an architecture-specific installer executable.
In doing so, the code appears to have broken the ability to build
installers on non-Windows platforms.
The current code is
if self.plat_name == 'win32':
 sfix = ''
else:
 sfix = self.plat_name[3:] # strip 'win' - leaves eg '-amd64'
filename = os.path.join(directory, "wininst-%.1f%s.exe" % (bv, sfix))
return open(filename, "rb").read()
This says "strip 'win'", but in practice strips the first 3 characters
from any plat_name other than win32.
I've attached an untested patch to fix this, by setting sfix to '' if
self.plat_name doesn't start with 'win'.