[FC]

I opened it without problems, do you have correct values in MapSize file?

How or where do we find correct values for MapSize file ?

Easiest way is to open one of the map files and see image information.
map_h, map_T, map_F are sized at 1 pixel = 200m

You only need to put height of the map so for example Normandy map_h.tga is:
768x512 pixels
512x200=102400 and that's value you have to put in MapSize file.