For anyone struggling to get it running on steam deck, it took some tinkering but this comment on reddit helped me out! This was for general exe files to run on steam deck
“”I tried many things after it didn't work for me, but here's what to do. Install whatever you want with wine(like proton, but works as if you were in windows, you can get it in the "app store") Open steam on the desktop client Add non steam game, find the exe and add it Then right click on the icon, and go to properties. There you find the file path but it's wrong, so click on browse and find the exe again Then again properties and go to force compatibility layer, then select one. Experimental fine, but last numbered probably more stable.
Then you can launch it from the gaming steamos You can add icon or picture while you're in desktop mode.
“”