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Steam Deck/Fixes/Rockstar Games Launcher/Steam

From PCGamingWiki, the wiki about fixing PC games
Install Rockstar Games Launcher games through Steam[1]
  1. Press Steam and then Power, then select Switch to Desktop.
  2. Open Firefox or any browser.
  3. Download Epic Games Launcher Windows installer Rockstar-Games-Launcher.exe from the Rockstar website.
  4. In Steam, click Games and Add the installer as a non-Steam game.
  5. Navigate to /home/deck/Downloads/.
  6. Change File type to All Files and select Rockstar-Games-Launcher.exe and Add to programs.
  7. In the Library, right click on the installer and click Properties.
  8. In Compatibility check Force the use of a specific Steam Play compatibility tool and check latest Proton version.
  9. Launch Rockstar Games Launcher from Steam in the Non-Steam tab.