On Windows XP SP2 and Python 2.3.3 or 2.4 a call to
os.remove returns Errno 13 permission denied on a
read-only file.  On linux, python will delete a
read-only file.

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Yup. I can reproduce that on Win2k.

Seems posixmodule.c uses _unlink, _wunlink, which are
documented at MS as failing on readonly:

"Each of these functions returns 0 if successful. Otherwise,
the function returns –1 and sets errno to EACCES, which
means the path specifies a read-only file, or to ENOENT,
which means the file or path is not found or the path
specified a directory."

Seems others have "fixed" it by just changing the mode and
trying again:
http://sources.redhat.com/ml/cygwin/2001-05/msg01209.html
https://www.cvshome.org/cyclic/cvs/unoff-watcom.txt

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This is a platform issue; Windows associates delete privileges 
with the file, Unix with the directory.  I doubt it's a good idea 
to "fix" Python's remove by making it incompatible with the C 
library's implementation.

(on the C level, unlink() is the same thing as remove(), btw).

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No followups in over 6 months. Closing.