[issue2508] When you create a file using file(path, "w") if the filename is illegal it throws an irrelevant error message

[kobi]

New submission from kobi <kobipe3 at gmail.com>:

It throws an IOError: ... No such file or directory: %path% instead of 
IOError: Invalid file name.

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Tracker <report at bugs.python.org>
<http://bugs.python.org/issue2508>
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