This is the most common method found on forums. It works for a basic widescreen resolution and a corrected FOV, but does not modernize the game's engine.
Inside the folder, look for a file named unnamedsoldier.cfg . If you have the Spearhead or Breakthrough expansions, look inside the mainta or maintt folders for the same file. Step 2: Edit the Resolution Values This is the most common method found on forums
seta r_aspectratio "1"
If you do not want to use external files, you can force the resolution through shortcut parameters, though this may require manual FOV adjustments. If you have the Spearhead or Breakthrough expansions,
If you own the Spearhead or Breakthrough expansions, you must replicate this process for those campaign folders. Go to the folder (Spearhead) and maintt folder (Breakthrough), open their respective configs subfolders, and append the exact same text strings to the bottom of their unnamedsoldier.cfg files. Method 2: Adjusting the Field of View (FOV) Go to the folder (Spearhead) and maintt folder
Which are you running (Steam, GOG, EA App, or original CD)?