How to Install Configuration (.cfg) files.

Text files with the .cfg extension are not installed through the mod injector like zipped mods are. Instead, you place them in DOOM Eternal's "base" folder and run them with the exec console command. Suppose you save a configuration file named performance.cfg. You would press the ` key to open the game's command line console, type exec performance.cfg, and press enter.

Running configuration files automatically.

If you want a particular .cfg file to be run every time you start up the game without needing to run a command, add the exec line to candidate.cfg.

The candidate.cfg file is overwritten by Steam whenever you verify the integrity of files, or when a new game update is installed. For this reason it is recommended to put your preferred commands in a separate file and executing that instead of placing anything other than exec commands here.

Using hidden commands.

Sometimes, configuration files will use console variables that are normally not executable in the main engine. If when running such a file in the main game, you get error messages saying that a command was not found, then these commands will need to be unlocked. Simply download and run the mod injector as explained in How to Install Mods.

The sandbox engine that natively integrates with the official mod portal already has these hidden commands and variables. No additional steps are needed to use these configs when playing the game via the "Play DOOM Eternal with mods" button in the mod portal.