Hello!
It seems I found a bug:
If a Windows user name contains Russian characters (Cyrillic) - the program crashing with an error message «unable to create file ""»
And it seems the problem is not only for Cyrillic users:
http://www.onmy.org/2009/06/24/winff-error/ 
C:\Users\LatUsername\AppData\Roaming\Winff — ok!
C:\Users\CyrUsername\AppData\Roaming\Winff — fail.
C:\Users\NotLatUsername\AppData\Roaming\Winff — ?
Please check
