Baseline (Widescreen) Solution & Issues
Select your resolution from the Settings menu then click Save and confirm.
Settings are saved in Documents\My Games\DemolitionCompany\game.xml
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
Eyefinity / Surround Specific Solution & Issues
Screen change:
Gameplay is Hor+, all 2D elements and screens stretch.
Notes:
The FOV is calculated from your desktop res (i.e playing at a fullscreen 1680x1050 over a 5040x1050 desktop would result in stretched gameplay).
Horizontal mouse movement seems to be tied to the display width somehow. Although the difference is negligible in widescreen, turning around is painfully slower in multi-mon. Think Metro 2033, but the opposite issue.
4k UHD Specific Solution & Issues