Baseline (Widescreen) Solution & Issues
Game supports widescreen resolution by default, but the screen is only stretched.
Hor + solution:
Replace groove.exe depending on aspect ratio - Emperors New Groove.7z (mirror link)
For automatic aspect ratio support, use Brandondorf9999's fix.
The following float addresses in the executable are these elements:
16D6B1 - Horizontal Aspect Lock
16D736 - FOV
They're all in default of 1.
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
Eyefinity / Surround Specific Solution & Issues
4k UHD Specific Solution & Issues