Additional Note:
You may need to change the line AspectRatio=2 to AspectRatio=4 located in %USERPROFILE%\Documents\Assassin's Creed Liberation HD\Assassin3.ini and set Assassin3.ini to Read-only to get Ultrawide working in the game.

Software Requirements:
1.HxD


Tutorial:
1. Open Program HxD > Click File and Open ACLiberation.exe
2. Ctrl+R > Click "Hex-values" > Click Search Direction "All" > Write 55 55 15 40 in Search for,
3. Replace with Hex value of your Resolution's Aspect Ratio , Here are some common resolutions:

2560x1080 = 26 B4 17 40
3440x1440 = 8E E3 18 40
3840x1080 = 39 8E 63 40
3840x1440 = AB AA 2A 40
3840x1600 = 9A 99 19 40
3840x1620 = 26 B4 17 40
5120x1440 = 39 8E 63 40
5120x2160 = 26 B4 17 40
6880x2880 = 8E E3 18 40


4. Click Replace All


5. Save and Play