[issue9923] mailcap module may not work on non-POSIX platforms if MAILCAPS env variable is set

[Éric Araujo]

Changes by Éric Araujo <merwok at netwok.org>:


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dependencies: +No unit test for mailcap module

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9923>
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