How do you make the strategical map bigger in the lobby window?
The image used in the lobby is mm_preview.tga.
So you can adjust that to be whatever you want, but the game will try to place the points(vp,fuel,muni) on that image.
So then you need to adjust the mapsize field in the INFO file. This is how the game places the points. But you may run into issues with your OOB area throwing things off.
Most maps are square and the map image is 768x768. The preview is normally shrunk 50% to 384x384. If your map is rectangular those sizes may be different.
_mm_LOW.tga is the minimap in game.
_mm_HIGH.tga may have been the FULLSCREEN version of the mm at one point. But I dont think it is used anymore.
_mm.tga is the Worldbuilder created map and gets overwritten when you export the map.