https://bugs.winehq.org/show_bug.cgi?id=46755
debilerpc@web.de changed:
What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |NOTOURBUG Status|UNCONFIRMED |RESOLVED
--- Comment #11 from debilerpc@web.de --- Hi, I figured out the reason for this problem on my system, which had nothing to do with Wine, although Wine was the only place where it manifested.
During an Arch Linux a system update, it seems the deprecated file ~/.config/plasma-locale-settings.sh became converted to ~/.config/plasma-localerc, and thus became activated again. At least that's my theory why the problem only manifested after the last update, and why both files were present.
More info: https://wiki.archlinux.org/index.php/locale#My_system_is_still_using_wrong_l...
This file contained the invalid locale en_DE for unclear reasons. What it did was setting the user locale to en_DE after logging into Plasma Desktop. It seems every app *except* Wine defaulted to a valid locale. Wine however defaulted to ASCII.
The problem completely went away after deleting ~/.config/plasma-localerc.