[issue24479] Support LMMS project files in mimetypes.guess_type

[Ned Deily]

Changes by Ned Deily <nad at acm.org>:


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keywords: +easy
stage:  -> needs patch
versions: +Python 3.6 -Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24479>
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