I can edit a scenario file, but I want to keep the original playable as well, particularly since I am making some fairly radical changes to the modified one.   I tried copying the USA scenario in the maps folder and making a duplicate called expirimental.   I also added a file to the scenarios folder and changed the name to Expirimental.PMscenarioXML and added Expirmental to the scenario name tag in that file.  Also added to the MainMaps.PM2MapListXML file.

When I try to play the scenario it allows me to select it from in the game, but it is reading the files from the USA scenario.

What am I missing on this, is this possible to do?  There was something like an explanation in the Independent parties thread, but the code block tag wasn't used so the post is partial.