Yes, for DOS games. However, DirectX games were much easier... I remember patching F-22 Total Air War (a DiD Flight Sim) to support higher resolutions back in

Yes, for DOS games. However, DirectX games were much easier... I remember patching F-22 Total Air War (a DiD Flight Sim) to support higher resolutions back in 2001 or something, and it was just 3 bytes or so that needed changing, and worked surprisingly well... (Seem to remember a bit of a community doing it in various games on the simhq.com forums back then.)