[issue4963] mimetypes.guess_extension result changes after mimetypes.init()

[S Arrowsmith]

S Arrowsmith <siona at chiark.greenend.org.uk> added the comment:

Ah, yes, forgot to mention this is on Debian 4.0. I doubt you're going
to run into it on a Windows system unless you explicitly give init() a
mime.types file, looking at the knownfiles list used by default.

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