errno 22 instead of errno 2

[Glenn Linderman]

open("c:\abc","rb")

This simple one-line script, produces errno 22 on Python 2.6, but errno 
2 on Python 2.5.2

Is this an unintentional regression?  Or is this an intentional bug fix?

The file doesn't exist (errno 2) but I guess on Windows it is also 
somewhat an invalid file name (errno 22).

Yes, I'm aware that \a is ASCII 007.  Using a valid, non-existent file 
name produces errno 2 on both versions.

-- 
Glenn -- http://nevcal.com/
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