http://bugs.winehq.org/show_bug.cgi?id=11122
--- Comment #12 from el elton@schiert.net 2008-09-07 22:39:19 --- I had the same problem and found a workaround:
In /usr/share/X11/xkb/symbols/de in the section for the nodeadkeys layout I changed key <AE12> { [apostrophe, grave, cedilla, cedilla ] }; to key <AE12> { [acute, grave, cedilla, cedilla ] };
Now the bottom row is working the way it should.