Martin v. Löwis <mar...@v.loewis.de> added the comment:

Ok. It's probably not the most optimal thing we can do. It opens the directory 
with CreateFileW (specifying OPEN_EXISTING and BACKUP_SEMANTICS), then 
GetFileInformationByHandle. If we only want to find out whether the file is a 
directory, we could just to FindFirstFile, which wouldn't need to go to the MFT 
record.

I would be surprised if this makes a difference in practice, though.

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<http://bugs.python.org/issue11583>
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