In the early 90's I had this file,
APGKEYS.ZIP, that contains cheats for a bunch of Apogee games. But it doesn't include Duke Nukem II.
The games are:
Secret Agent
Duke Nukum
Commander Keen
Crystal Caves
Commander Keen 4, 5, 6
Cosmo's Cosmic Adventure
Paganitzu
Wolfenstien 3D
Halloween Harry
Bio Menace