In the new 4.2.3, the game now launches due to the .net fix, but the steam overlay doesnt work with it. IIRC, some of the DOSbox games are like this in windows, so maybe it isnt a bug
Hello @opal1974, please add [`PROTON_LOG=1 %command%`](https://github.com/ValveSoftware/Proton#runtime-config-options) to the game's launch options and drag and drop the generated $HOME/steam-$APPID.log into the comment ...