Baseline (Widescreen) Solution & Issues
The game automatically uses the correct aspect ratio for your resolution. You can select a custom aspect ratio for any resolution as well if you wish. (4:3, 16:10, 16:9). The game does NOT support any AR wider than 16:9.
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
For 21:9 the Game is Streched out of the Box - use HEX edit to get HOR+
Hex edit Aspect Ratio: Go to --> ...\Game DIR\iw3sp.exe
Look for 39 8E E3 3F and change it to CD 90 18 40
Now the Aspect Ratio of the Game,Menues and HUD is correct.
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Alternative FOV edit:
Go to --> ...\Game DIR\iw3sp.exe
Look for 00 00 82 42 and change it to your des. FOV Value f.e. 00 00 B4 42 (FOV 90 see Screenshots)
Eyefinity / Surround Specific Solution & Issues
For Surround the Game is Streched out of the Box - use HEX edit or Widescreenfixer to get HOR+
Hex edit Aspect Ratio: Go to --> ...\Game DIR\iw3sp.exe
Look for 39 8E E3 3F and change it to AB AA AA 40 (3x16:9) or 9A 99 99 40 (3x16:10)
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Alternative FOV edit:
Go to --> ...\Game DIR\iw3sp.exe
Look for 00 00 82 42 and change it to your des. FOV Value f.e. 00 00 B4 42 (FOV 90 see Screenshots)
4k UHD Specific Solution & Issues