If your resolution is accidentally reset, re-edit this file, or make it Read Only once you applied all the tweaks you want. You can now adjust and test the remainder of your settings. To check your new resolution go to Performance>Advanced Video Options and check the 'Screen Resolution' setting which should display the new resolution. However don't go back into the Display settings screen in the in-game options as this will reset your resolution to one of the default resolutions. Upon restarting the game your custom resolution will be applied. Next, close the game and Edit the lines above - change the ScreenWidth to the pixel width of the custom resolution you desire, and the same for ScreenHeight. However before setting a custom resolution, first go into the Options menu in FEAR and set the Display options you want (aside from resolution).
Fortunately you can assign a custom resolution by editing these lines in the Settings.cfg file.
FEAR does not support certain resolutions from within the game.
