: Changes made to the base game's config often don't carry over to Spearhead ( mainta ) or Breakthrough ( maintt ). You must apply the same edits to the .cfg files within those specific folders.
with a text editor like Notepad. Add or modify the following lines at the bottom of the file: seta r_customwidth "1920" (Replace with your monitor's width) seta r_customheight "1080" (Replace with your monitor's height) seta r_mode "-1" (This enables the custom resolution mode) Save and Launch
: Run the game and set your preferred graphics options (except resolution) to generate necessary files.
The most reliable method to force a custom resolution—such as 1920x1080 or 2560x1440—is by editing the game's configuration files.