i found this data base page just now and adding link in under:https://www.protondb.com
you can log page with steam account and check your game ratings faster after like this:
EXPLORE --> LIBRARY
good tip add wineprefix for proton games with site help.
in /home/username/.local/share/Steam/steamapps/compatdata/ is folder with numbers like 39200
its dungeon siege 2 game proton setting folder and proton database have same number, so you don't need speculate wich folder is it:https://www.protondb.com/app/39200
in behind link you can found how to fix graphics problem.
i tested fix and worked nicely, but after rebooted manjaro.
WINEPREFIX="/home/UserName/.steam/steam/steamapps/compatdata/GameFolderNumber/pfx" winetricks CommandQuateBox
change XX to like 46 to get ms .net 4,6 versio instelled. winetricks app you can check other versios from winetricks
it was keep in last, but updated own protondb page:https://github.com/ValveSoftware/Proton/issues/57
add some comments if page is useful.
this topic should add to sticky topics if possible.
some useful wineprefix commands