https://bugs.winehq.org/show_bug.cgi?id=49988
--- Comment #6 from pardisetm@gmail.com --- (In reply to Fabian Maurer from comment #5)
Is it this game? https://store.steampowered.com/app/550470/NosTale__Anime_MMORPG/
No this is the steam version who works fine with proton (I think) Here we talk about the Gameforge version :
https://gameforge.com/en-US/play/nostale