Ok, I spent all day with this game. It is a small gog file, and was trying to use it on a friends laptop. I just fixed it, and wanted to be sure the onboard gpu worked. Which, leads me to this is a broken gog port to an extent. Multiplayer worked. Butcher bay even worked. But for whatever reason, Assult on dark athena just will not run. Halfway through Vin Diesels monologe, the game just crashes.
Which, led me to reinstall it on my own personal desktop. Led me to this issue. So!! On AMD cards, virtual super resolution works fine. But if I leave GPU up-scaling and ITC processing on, the game tops out at 1366x1024. Even if you go in the config file, it doesn't actually change anything for me. Actually turning OFF upscaling and ITC processing, both in digital flat panel properties, caused the game to unlock its resolutions for me. Which is the opposite of what one other poster said. Personally? I'd fool around with the cataylst control settings until you get it unlocked.
Now note. Along this process, I tried installing the 1.01 patch not from GOG. DO, DO NOT DO THIS! A- it installs the Tages DRM, that was on the original pc release. And the game won't run anymore.