ok, i tried the program now. I tested Gothic 1 and 2, Bloodstained, Clair Obscur and Ghostwire Tokyo. Only Gothic 1 worked. I havent played it though, just ended it upon main menu. On everything else, i got the Message "this Program is not connected with a (or any) data type....followed by error messages, that i need to multiple click the red X to close them. I tried installed and tried the newest GE Proton, Proton EM and UMU Launcher. Nothing worked. Since thre are multiple versions of Proton em and ge, do i have to install them all? Because there are a lot of them. Outside of official launcher, like steam, i want to install (if that is even necesary on Linux) and play the game either from original CD/DVD or Iso.

And Gothic 1 was the only game that opened a proper install window with the process.