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From: Peter Otten <__peter__@web.de>
Subject: Re: Possible bug with stability of mimetypes.guess_* function output
Date: Sat, 08 Feb 2014 09:39:06 +0100
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Asaf Las wrote:

> On Saturday, February 8, 2014 9:51:48 AM UTC+2, Peter Otten wrote:
>> 
>> At least the mimetypes already defined in the module could easily produce
>> the same guessed extension consistently.
> 
> imho one workaround for OP could be to supply own map file in init() thus
> ensure unambiguous mapping across every platform and distribution. guess
> some libraries already doing that. or write wrapper and process
> all_guesses to eliminate ambiguity up to needed requirement.
> that is in case if bug request will be rejected.

You also have to set mimetypes.types_map and mimetypes.common_types to an 
empty dict (or an OrderedDict).