Weird. It works now, and I didn't change anything. I DID remember to save Wordpad after I inserted the line, and I DID close Icon and run it again, but it didn't work. So I closed Icon again, went to do something else, and re-opened it, and it works. I probably forgot to save or restart SOMEthing somewhere. Oh, well.
So, if someone wants to insert the line into their "maps.mnu" file, there it is. It's great to have the "real" AP back, without the shiny new flower bushes that looked suspiciously like the ones in Nova Praetoria; they made AP look like Praetoria had established a foothold.