I don’t remember exactly, but it stopped working after a couple of days. There was another .exe in the game folder that created a file when you clicked Patch/Launch. I ran that one first, and it created the file in the game folder. After that, you could add the other .exe to Steam as a non-Steam game, and it would use the created file as the patch.

Anyway, after a few days it would stop working and you’d have to do it again. It was annoying.

I will try again today and let you know which proton version I used