Fix file association MIME type on Windows

[zooba]

BPO	39631
Nosy	@mhammond, @pfmoore, @tjguk, @zware, @zooba, @ZackerySpytz, @miss-islington
PRs	bpo-39631: Fix file association MIME type in the Windows installer #20205 [3.9] bpo-39631: Fix file association MIME type in the Windows installer (GH-20205) #20216 [3.7] bpo-39631: Fix file association MIME type in the Windows installer (GH-20205) #20219 [3.8] bpo-39631: Fix file association MIME type in the Windows installer (GH-20205) #20220 bpo-39631: Adds NEWS entry #20227 [3.9] bpo-39631: Adds NEWS entry (GH-20227) #20241 [3.8] bpo-39631: Adds NEWS entry (GH-20227) #20242 [3.7] bpo-39631: Adds NEWS entry (GH-20227) #20243

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-05-19.22:11:47.282>
created_at = <Date 2020-02-14.08:49:42.477>
labels = ['3.8', 'type-bug', '3.7', '3.9', 'OS-windows']
title = 'Fix file association MIME type on Windows'
updated_at = <Date 2020-05-22.22:29:17.392>
user = 'https://github.com/zooba'

bugs.python.org fields:

activity = <Date 2020-05-22.22:29:17.392>
actor = 'miss-islington'
assignee = 'none'
closed = True
closed_date = <Date 2020-05-19.22:11:47.282>
closer = 'steve.dower'
components = ['Windows']
creation = <Date 2020-02-14.08:49:42.477>
creator = 'steve.dower'
dependencies = []
files = []
hgrepos = []
issue_num = 39631
keywords = ['patch']
message_count = 11.0
messages = ['361989', '361990', '369339', '369342', '369345', '369347', '369348', '369397', '369399', '369400', '369663']
nosy_count = 7.0
nosy_names = ['mhammond', 'paul.moore', 'tim.golden', 'zach.ware', 'steve.dower', 'ZackerySpytz', 'miss-islington']
pr_nums = ['20205', '20216', '20219', '20220', '20227', '20241', '20242', '20243']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue39631'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']

[zooba]

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.

[zooba]

The most likely negative potential impact of this would be for any users who have added additional verbs based on the content type. I don't recall whether we set PerceivedType or not, but that can probably stay.

I'm not aware of any applications (besides Windows itself) that set verbs based on content type rather than extensions, so I doubt anyone will be too upset.

[zooba]

New changeset 8c862e5 by Zackery Spytz in branch 'master':
bpo-39631: Fix file association MIME type in the Windows installer (GH-20205)
8c862e5

[zooba]

Actually, now that I've gone and hit merge, I've changed my mind about the NEWS entry. I'll add it.

[miss-islington]

New changeset c06983b by Miss Islington (bot) in branch '3.9':
bpo-39631: Fix file association MIME type in the Windows installer (GH-20205)
c06983b

[miss-islington]

New changeset 076da79 by Miss Islington (bot) in branch '3.7':
bpo-39631: Fix file association MIME type in the Windows installer (GH-20205)
076da79

[miss-islington]

New changeset 46fc3ec by Miss Islington (bot) in branch '3.8':
bpo-39631: Fix file association MIME type in the Windows installer (GH-20205)
46fc3ec

[zooba]

New changeset 92327a9 by Steve Dower in branch 'master':
bpo-39631: Adds NEWS entry (GH-20227)
92327a9

[miss-islington]

New changeset 67bbb5d by Miss Islington (bot) in branch '3.7':
bpo-39631: Adds NEWS entry (GH-20227)
67bbb5d

[miss-islington]

New changeset 381ceea by Miss Islington (bot) in branch '3.8':
bpo-39631: Adds NEWS entry (GH-20227)
381ceea

[miss-islington]

New changeset 1e5cf94 by Miss Islington (bot) in branch '3.9':
[3.9] bpo-39631: Adds NEWS entry (GH-20227) (GH-20241)
1e5cf94