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Hi,
I am running Canopy on Windows 7 64 bit.
When I run the attached file, I get the following error:
----> 5 with open('C:\Users\Anwender\Desktop\Test\blub.txt') as csvfile:
 6 dialekt = csv.Sniffer().sniff(csvfile.read(1024))
IOError: [Errno 22] invalid mode ('r') or filename: 'C:\\Users\\Anwender\\Desktop\\Test\x08lub.txt' 
As you see, Python complains about the file name after it changes the file name for no reason.
The thing is, when I use a capital letter after every back slash it is fine, but I needed quite some time to figure that out. So it is very annoying for everyone encountering the problem for the first time. 
Also numbers at the beginning of a file name seem not to work either.
Thank you for developing Python!