Registration means nothing for mapping. Fetch Anna's
Soldat PolyWorks, the most powerful map editor out there. Take a look at its manual (it's in the question mark in the top-right of the program), and study default map structure. You can also download the original MapMaker for more help (it's in the Editors section of the Downloads section at Soldat.pl), as it also has its own, more basic manual, which I think is personally easier to understand.