A very simple method without extra file manipulation than the mod itself that launches Fallout1in2 exactly as Proton launches Fallout 1 on Linux; The swap is done by Proton launch options; it’s just not obvious that all you need to do is edit the launch parameters provided for this purpose. Briefly, this is the way to launch an application under Proton, so it is good to remember the trick as it is adaptable to many use cases. Switching to Fallout1in2 or returning to vanilla Fallout1 is as simple as adding/removing the launch options.
Guide to Launch Fallout1in2 Mod on Steam Deck and Linux
Install Fallout1in2 on Steam Deck
Follow the instructions provided by the Fallout1in2 author but ignore the Steam part Fallout1in2 Install Instructions.
in Steam > Fallout 1 > Properties, insert the following launch options:
SteamAppId=38400 SteamGameId=38400 STEAM_COMPAT_DATA_PATH="/home/deck/.local/share/Steam/steamapps/compatdata/38400" STEAM_COMPAT_CLIENT_INSTALL_PATH="/home/deck/.local/share/Steam" "/home/deck/.local/share/Steam/steamapps/common/Proton - Experimental/proton" run "/home/deck/.local/share/Steam/steamapps/common/Fallout 2/Fallout1in2/Fallout2.exe"Note
Update the directory name accordingly if you are not using Proton – Experimental (and also the deck user if you are on a common Linux desktop).
Result
You will officially run Fallout1in2 and it will appear as though you are playing Fallout1.
Feel free to bring up any points for discussion if things are unclear; I will try as much as possible to help you gladly and gradually build a simple FAQ. However, normally the installation process is very well done and already supports a method compatible with Linux to extract the game files with a bash script.
Important note: Proton – Experimental must match the directory of Proton in your common/ Steam folder, or update the complete path accordingly if using a custom install of Proton, or even Steam. It is simply a matter of defining the appropriate environment variables for your system.
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