[issue9222] IDLE: Fix open/saveas 'Files of type' choices

[Tal Einat]

Tal Einat <taleinat at gmail.com> added the comment:

On Windows, I can't think of any common reason to want to save a file edited in IDLE without the .py extension. On the other hand, accidentally forgetting the .py extension is annoying, and users have come to expect a default extension being added by applications (e.g. MS Office).

Guilherme's patch (applied manually) works fine here on Windows7. I'm all for committing this if it has been tested to work as expected on Linux and OSX.

(minor nit-pick: could use sys.platform.startswith('win') instead of slicing)

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nosy: +taleinat

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