http://bugs.winehq.org/show_bug.cgi?id=35370
--- Comment #3 from Jerome Leclanche adys.wh@gmail.com --- Don't run it directly in winedbg. dbghelp will automatically take care of launching the debugger when wow crashes and giving you a decent backtrace.
Since wow ships its own version of dbghelp.dll you might want to move it away from the wow folder temporarily.