Baseline (Widescreen) Solution & Issues
This method is an .ini edit.
C:\My Documents\Harry Potter II\game.ini
[windrv.windowsclient]
FullscreenViewportx=
FullscreenViewporty=
Then, in the user.ini file, edit these lines:
[Engine.PlayerPawn]
DesiredFOV=100.39
DefaultFOV=100.39
The default FOV is 90, so the 16:10 FOV is 100.39487232
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
Eyefinity / Surround Specific Solution & Issues
4k UHD Specific Solution & Issues
Issue: Game starts windowed 1920x1200 because of the high res not properly handled by the engine. Unreal engine 1 doesn't support resolutions properly past 2560x* (unable to test the exact resolution.) Known issue also for original UT99.
Issue: Because I started at such an high res, i noticed in the whomping willow cutscene that the fence and wall behind the tree were visible in front of it. any case of dept is completely destroyed.