[issue37517] Improve error messages for Windows reserved file names

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

Presumably this is linked to issue37515 (why not just repurpose that one?), but I'm inclined to think this is okay provided:

* if the operation succeeds, no error/message is displayed
* if the operation fails, we only update the error message if one of the special filenames is the target

So probably this ought to be a special case in PyErr_SetFromWindowsErrWithFilename(). And either we need to search the string for the special names or find an API that will clarify it (GetFileAttributes?).

I definitely do not want every error message suggesting that this edge case may be the cause, and I don't want to prevent people using these names or purpose for their actual uses.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37517>
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