Baseline (Widescreen) Solution & Issues
The Racer_S hack doesn't work in v1.1 ( only v1.0 ). So don't apply the patch if you intend to use the hor+ hack.
Most native resolutions are supported natively. A few such as 1280x768 are not. If yours isn't, you need to use the command line parameters -ResX= and -ResY=. For instance, if you installed the game to D:\Stranglehold and you wanted to use 1280x768, you could edit the shortcut so that it looks like this:
"D:\Binaries\Retail-Stranglehold.exe" -language=eng -ResX=1280 -ResY=768
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
The Racer_S hack doesn't work.
command line parameters -ResX=2560 and -ResY=1080 needs to be added to the shortcut. Gameplay is vert- and hud is stretched.
Only the menu rendered on the game's engine is hor+, tha game itself is vert-
Eyefinity / Surround Specific Solution & Issues
4k UHD Specific Solution & Issues
command line parameters -ResX=3840 and -ResY=2160 needs to be added to the shortcut.