I've been playing MW3 since months now on my ASUS ROG SWIFT PG348Q (34", 3440x1440, 21:9) on a resolution of 2560x1440 which is fine but I get the black stripes on the left and right side. Now I found this beautiful tool "flawless Widescreen" and "widescreen fixer", but I can't manage to get either of them to work in 21:9 wide screen.The game itself offers a resolution of 3440x1440 but it looks pretty crappy.
I set the image quality to "native" in the advanced menu. and both tools indicate the the fix is "on".Any advice if the game could be set to 21:9 in 3440x1440?

Any help will be apprecited.

I didn't find the right solution from the Internet.

animated medical device video

Thank you.