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. If when running such a file, you get error messages saying that a command was not found, then these commands are only usable in the new sandbox executable available in the pc-mod-preview opt-in beta branch. In the launcher, click Mods, Play Mods, then "Play DOOM Eternal with mods" to access the modded engine.

If you downgrade your game to use the old mod format, note that the legacy mod injector comes with a patch that will unlock console commands on the old version of the game.