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I verified that launching the script from a CMD.EXE window instead of
from Cygwin also reproduces the "can't overwrite ZZZ.pyc". Here's a
sample of "python -v" showing this:
 # C:\depot\central\ntf\tools\bin\build1.pyc has bad mtime
 import build1 # from C:\depot\central\ntf\tools\bin\build1.py
 # can't create C:\depot\central\ntf\tools\bin\build1.pyc
If you would like some help, I can discuss this with Windows expert
programmers here and see whether they can suggest a solution you might
find acceptable. Thank you.