Apparently this was a mistake that has proliferated over a very long time. The Software item that was being modeled was actually the game/machine equivilent from SoftwareList. But because there's both an item called SoftwareList and a DAT type called SoftwareList, some wire got crossed and they were mentally combined. Undoing this allows for a more proper internal model, including a couple of extraneous keys that were included originally.
