Hi again I Am Herenow,
Almost! I, think, sorry, I may be wrong as I'm not a modder, that it stands for the files in M2:TW and R:TW installations know as export_descr_units (EDU) and export_descr_buildings (EDB). They both determine what the building's and unit statistics are within the two games and can be modded easily and at will. Hope this helps, cheers!