https://bugs.winehq.org/show_bug.cgi?id=49378
--- Comment #1 from Rafał Mużyło galtgendo@o2.pl --- ...it might be completely unrelated, but (mentioned this awhile ago on irc) I've recently ran into an interesting case: a Unity game, that was crashing due to 'address space exhaustion', that before the crash was printing a stack trace several times.
The potentially relevant part is that the game was run under LANG=ja_JP.utf8 and the stacktrace contained mojibake...
...but only if run as 'LANG=ja_JP.utf8 wine <executable>', if I redirected the log via 'LANG=ja_JP.utf8 wine <executable> 2>&1 | tee crash.log', both the crash log and the console output were mojibake-free.