http://bugs.winehq.org/show_bug.cgi?id=58138
--- Comment #2 from Rafał Mużyło galtgendo@o2.pl ---
Any ideas what that garbage dst value in MultiByteToWideChar call might be referring to ?
Sorry, that's both stupid and irrelevant question.
But there's a better one: is your version of wine locally patched ? The source lines in the backtrace don't seem to align with the vanilla tree...