Have you tried the file "RM?"
Also, check out the file "groupings," that may influence how maps are defined (i.e. standard, etc).
Just want to make sure: your map is a Random Map Script, not a scenario map, right?
Also try placing the file in the RM folders that are located in the main game location, under Program Files->
Microsoft Games-> Age of Empires III.
i.e. C:\Program Files\Microsoft Games\Age of Empires III[This message has been edited by General_II (edited 03-16-2008 @ 09:18 PM).]