_
are you sure it's map_T are referring to?
i don't know of any specific tools for map_T, however there are definitely tools for map_C, which needs to be unpacked/repacked when working with it....
Yes, I am speaking about map_T, i,e. texture map. You see, when building a map, you use both unlocked FMB for example for replacing roads relocating airfields and cities, you are correcting waters in map_C, and similar correction. As a result, the ed_m0X files should be actualised, which may be done by hand, but there was a program called such as "decomp", which allowed your (or other) map_T to extract into several layers, each of which contains only water, only wood, only roads etc, where the adjustments can be done much easier.
Unfortunately, the program did not work for me and the author seemingly disappeared .