[issue39631] Fix file association MIME type on Windows

[Steve Dower]

New submission from Steve Dower <steve.dower at python.org>:

The installer for Windows creates file associations in Tools/msi/launcher/launcher_reg.wxs that identify ".py[w]" files as text/plain.

This is inconsistent with the mimetypes module, which uses text/x-python, and may cause some applications to assume that calling ShellExecute on a .py file will open a text editor rather than executing the script.

We should update the MIME type to text/x-python. This can be backported, as the change is in the launcher and isn't tied to the usual upgrade paths anyway.

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components: Windows
messages: 361989
nosy: paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
stage: needs patch
status: open
title: Fix file association MIME type on Windows
type: behavior
versions: Python 3.7, Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39631>
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