Baseline (Widescreen) Solution & Issues
Resolutions are detected both in-game and in the launcher. HUD/UI elements have the correct dimensions but do not increase in size at higher resolutions.
All 3D elements are stretched from 4:3. To fix this, edit Render2.dll in a hex editor and change AB AA AA 3F to the aspect ratio you want (see common hex values). A collection of pre-patched DLLs are attached to the report (made from the Steam version). Fix available from the PC Gaming Wiki Community Files (search there).
FMV cutscenes and loading screen backgrounds are stretched from 4:3.
Changing the resolution may cause the in-game resolution option to show "666" as the only option. Resolutions can still be set in the launcher (start.exe) after this happens. Resolutions can also be set in the registry:
HKEY_CURRENT_USER\SOFTWARE\Nikita\ParkanII
Set ScreenWidth and ScreenHeight in Decimal format.
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
Eyefinity / Surround Specific Solution & Issues
Same as widescreen. In ground exploration mode the camera clips into the shoulder weapon (see the additional screenshots section).
4k UHD Specific Solution & Issues