Baseline (Widescreen) Solution & Issues
Use XL Engine. All resolutions are detected from the system and listed in-game.
Menus, FMVs, and in-game text are stretched from 4:3. The HUD, player weapon, sprites, and all 3D elements are scaled correctly.
NOTE: the game can be completed with XL Engine, but some workarounds are required to proceed at certain points in missions (see Getting started with XL Engine).
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
Eyefinity / Surround Specific Solution & Issues
The DarkXL pre-game menu has overlapping buttons but is still fully usable.
4k UHD Specific Solution & Issues