Hallo,

currently it is possible to use ultra-wide monitors with a customized config. There some guides [1] and calculators [2] for the config file out there. In my case i have a 49" Monitor with a resolution of 5120x1440 and an aspect ratio of 32:9 .

My current used settings are:

tripleHead=0;
winHeight=1440;
winWidth=5120;
fovTop=0.91000003;
fovLeft=3.24;
uiTopLeftX=0.36875001;
uiTopLeftY=0.15000001;
uiBottomRightX=0.63125002;
uiBottomRightY=0.85000002;
IGUIScale=0.69999999;

[1] https://bdf.bdclub.de/guides/armed_assault/troubleshooting/329_ultra_wide_screen_and_arma_ui_trouble
[2] http://hia3.com/tools/armafovcalculator-en