Originally Posted by
mefistotelis
In Dungeon Keeper, if you press "new game", a campaign starts which consists of maps MAP00001 to MAP00020, and has secrets MAP00100 to MAP00105. Original DK can't use campaigns with different map numbers or with files somewhere else than in "levels" folder. There's also no way to move the ensigns representing levels in land view, or make less/more levels than 20+6.
KeeperFX allows you to integrate any amount of campaigns with the game; every campaign has its own .CFG file which defines map numbers, folders and ensigns for it. If you want to make another campaign for KeeperFX, you just have to copy one of existing campaign config files and modify it so your maps will be used. The file for original campaign (keeporig.cfg) contains lots of comments, so it's easy to create new campaigns based on it.