[issue1561] py3k: test_mailbox fails on Windows

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

> mailbox.py is expected to work with files opened in binary mode
Not everywhere, unfortunately. Some files are still opened in text mode.
And this makes a huge difference with py3k: one accepts bytes, the other
requires strings.

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<http://bugs.python.org/issue1561>
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