Thank you for the thorough response!
I tried moving it to C:\Dungeon Keeper\, running Unearth+dernc as admin, and changing security settings giving full access to user/authenticated. However it still fails for both GOLD and FX:
Keeper FX: tmapa000, 001, 004, 005, 006 (All start with RNC / 52 4E 43)
"C:/Dungeon Keeper/FX/DATA/tmapa000.dat": 1469381268,
"C:/Dungeon Keeper/FX/DATA/tmapa001.dat": 1469381270,
"C:/Dungeon Keeper/FX/DATA/tmapa002.dat": 1469381270,
"C:/Dungeon Keeper/FX/DATA/tmapa003.dat": 1469381272,
"C:/Dungeon Keeper/FX/DATA/tmapa004.dat": 1469381275,
"C:/Dungeon Keeper/FX/DATA/tmapa005.dat": 1469381277,
"C:/Dungeon Keeper/FX/DATA/tmapa006.dat": 1469381278,
"C:/Dungeon Keeper/FX/DATA/tmapa007.dat": 1469381279
Gold: tmapa000, 001, 002 (Forgot to check, assume they start with RNC as well)
"C:/Dungeon Keeper/Gold/DATA/TMAPA000.DAT": 1650580993,
"C:/Dungeon Keeper/Gold/DATA/TMAPA001.DAT": 1650580992,
"C:/Dungeon Keeper/Gold/DATA/TMAPA002.DAT": 1650580993,
"C:/Dungeon Keeper/Gold/DATA/TMAPA003.DAT": 1650580993,
"C:/Dungeon Keeper/Gold/DATA/TMAPA004.DAT": 1650580993,
"C:/Dungeon Keeper/Gold/DATA/TMAPA005.DAT": 1650580993,
"C:/Dungeon Keeper/Gold/DATA/TMAPA006.DAT": 1650580992,
"C:/Dungeon Keeper/Gold/DATA/TMAPA007.DAT": 1650580992
GOG is set to automatically update Dungeon Keeper GOLD(Redownloaded to test), and KeeperFX is v0.4.8 build 2154.
PS: Could Python affect this, and if so which version is recommended?