Sigh, OK. Let's move on to a related issue: the actual computer files for custom enemy groups and missions.
I have a number of such files (custom enemy groups, previously written missions etc.) that I had saved from Live. So I put them once into my install of HC, and seem to recall I was able to access some of them, but then I had to re-install HC and moved them again into the new install and don't seem to see any of them (or much fewer of them) now.
They're currently sitting inside this path: Local disk - Game Files - Homecoming (sen below), along with all the usual files like "accounts, bin, cache, architect, etc. But the game clearly isn't recognizing/finding them or something, when I open up say My Local Missions, I don't see them.
I would guess they need to be put into the right files in there somewhere, like the previously-mentioned architect folder itself? Anyone know which file exactly?