Since some people have been have been finding the mapeditor somewhat daunting, I though I would take a few minutes to test that everything works fine and to make some quick notes. This is for those who have played a map, but would like to teak it a little.
I used a retail copy with update #2 for this, not our dev version, so that I was seeing exactly what you will see if you try it. Here’s what I did.
Canada Scenario.
I launched the game and looked at the scenario. I went in as Ontario and poked around. I decided that I wanted more Oil resources available and wanted more electricity capacity to start. Now that I knew what I wanted to edit, I quit the game and launched the map editor.
I selected “LOAD†and saw only Australia. This is because that is the only map in the “custom†folder initially. So I alt-tabbed and copied the .MAP, .GAM and .GMC files (see mapeditor documentation for location of files) into the custom folder. I then went back, hit load again and selected Canada.
With the map open, I started making changes. Switched Agri terrain to Agri with petrol, switched the Niagara airstrip to an airport, and place a few extra units of artillery in Toronto (six G6 Rhinos should help my cause

). I also increased the strength of the Pickering and Darlington nuclear power plants and increased an industrial goods plant slightly. I didn’t want to change those too much as their raw materials requirements would cascade into imports of other goods. (for details on editing these elements, see the mapeditor documentation)
With my changes done, I saved the map and quit the mapeditor. Since I wanted to make this a military map, I also went into the .GMC file with Notepad and increased the belli rating for player 1 to all other players. This way when Ontario attacks any other region, the WM will leave me alone about it. I then saved and closed the file.
With all of this done, I restarted the game. Single Player – Scenario – Custom scenario. In the list I had Australia and my new Canada map. I selected it and started it. All changes were there in the map.
That’s the basics of mapediting