https://bugs.winehq.org/show_bug.cgi?id=46303
--- Comment #7 from Wylda wylda@volny.cz ---
The call that is failing is following: 0008:0009:fixme:msvcrt:MSVCRT__toupper_l -23 (nil) 0008:0009:fixme:msvcrt:MSVCRT__toupper_l case 5: 201
Maybe it is already clear to you, but if not and want to see old behavior, what about taking old implementation add FIXME decoration?
BTW: it is Warcraft 3 Czech edition.