http://bugs.winehq.org/show_bug.cgi?id=23112
--- Comment #3 from Alexandre Julliard julliard@winehq.org 2010-06-23 13:36:09 --- That's a bug in the installer, it calls GetTempFileName twice but deletes the file first, so there is a possibility that both calls return the same file name (in our case, this happens if the tick counter hasn't incremented yet).