When creating an unlock ".scn" file name, do not use a dash in the name. MM/CC has a mistake in it where it will make some in-game objects available sooner than it should while loading a saved zoo when it sees an unlock file name with a dash in it. This is not a problem in the original ZT. There is also not a problem with dashes in ".cfg" file names. As an example, if you are creating an unlock file name for a Shelter For All Animals, you would use unlockshelterforallanimals.scn instead of using unlock-shelterforallanimals.scn.