i hope to teach you how to install and play windows gog games via steam on linux using proton.
download your ethically sourced gog game installer.
open up steam and click add game on the bottom left of the window.
add a non steam game. click browse and navigate to your installer directory.
click the installer and hit open
click add selected program.
right click the installer program you just added and go to properties.
under compatibility, check force, and select your flavor of proton. on nobara we are using proton-ge.
click the installer from the list and hit play.
this will run the gog installer.
before slapping install, go ahead and hit options
you’ll want to change the install directory to something on the linux side of things. you may see C:, but you should navigate to another listed directory that contains your home directory. i like to create a games folder inside my home directory. once satisfied, hit install. it’ll do its thing.
upon completion though, DO NOT HIT LAUNCH. instead make sure you exit.
you will now want to go through the process of adding a non steam game, browsing, and selecting the main exe for the install you just completed.
validate your directory and game exe, then open and add.
again, right click the game in the steam list and enter its properties. enter compatibility and do the same as before. force specific compat, and elect your flavor of proton.
now you can click the game in the list and hit play.
gg it works.
You can now right click and remove the gog install .exe from part one from your steam uncategorized list. then you can go to your directory and remove the installer files should you choose to do so. this process works with fitgirl and dodi as well.