https://bugs.winehq.org/show_bug.cgi?id=39025
--- Comment #13 from manualinux@gmail.com --- (In reply to Bruno Jesus from comment #8)
It looks like you have more drives than it's possible to mount, winecfg error seems clear in saying that it is running out of letters.
Please attach the output of: WINEDEBUG=+winecfg winecfg -d &> log.txt
In graphics mode it works perfectly. In Slackware 14.1 with the same fstab the command works. In FreeBSD 10.1 (amd64) with another smaller fstab the command fails.