[issue41434] IDLE: Warn user on "Run Module" if file is not .py/.pyw

[wyz23x2]

wyz23x2 <wyz23x2 at 163.com> added the comment:

It should be able to turn on/off this feature.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41434>
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