bpo-36516: Let Python Launcher recognize pyw file as Python GUI Script file type correctly.

[gjj2828]

https://bugs.python.org/issue36516

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[ned-deily]

Thanks for the PR. As noted on the bug tracker issue, I am holding off merging this PR for the moment pending a review of the Launcher app for 3.9.

[arhadthedev]

@zooba Is this PR relevant after gh-32062?

[ned-deily]

@arhadthedev This issue and PR concern a legacy Python Launcher app included with python.org macOS distributions; it is unrelated to the Windows launcher. Please leave it assigned to me.

[github-actions]

This PR is stale because it has been open for 30 days with no activity.