http://bugs.winehq.org/show_bug.cgi?id=11145
--- Comment #8 from Yolande Haneder yolande@haneder.biz 2008-01-12 08:39:13 --- In my case when the file already exists, it is skipped and not crashing. Yesterday's patch seems to help but you can't rely on this for long.
Other solution (even if some will argue...) is to make the install as root until you get your file on the FAT partition and use as user.