https://bugs.winehq.org/show_bug.cgi?id=57540
--- Comment #4 from Zsolt Vadasz zsolt_vadasz@protonmail.com --- (In reply to Rafał Mużyło from comment #2)
Also, both values might be wrong, as in that /usr/share/i18n/charmaps directory proper Windows Japanese charmap is WINDOWS-31J (aka CP932).
Wikipedia says that's an extended variant of Shift_JIS though?