https://bugs.winehq.org/show_bug.cgi?id=57286
--- Comment #8 from Tom M tmwine@pertho.net --- I do this copy:
cp /usr/lib/wine/x86_64-windows/dcomp.dll "$WINEPREFIX/drive_c/Program Files (x86)/Electronic Arts/Dark Age of Camelot/igd10umd32.dll"
And rerun: wine camelot.exe and it work.
I'm pretty sure it doesn't have anything to do with locales.