https://bugs.winehq.org/show_bug.cgi?id=57540
--- Comment #1 from Rafał Mużyło galtgendo@o2.pl ---
Some older visual novels require using the Japanese Shift JIS locale
Sorry, but that sounds fishy. Sure, quite a few Japanese games/programs needs to be run in the Japanese locale, but the charset req seems wrong.
Any examples that don't work under ja_JP.utf8 ?
(though I'm not disputing the validity of the patch - that's a separate matter)