I am not sure if this is what you're looking for:
Code:
Data\terrain\
	\aerial_map\
		\ground_types\
			desert_rocky_low_fertility.tga
			desert_rocky_medium_fertility.tga

		\tile_textures\rocky_desert\

	\battlefield\rocky_desert\
Data\models_vegetation\
	rockydesert_foliage_01.cas
	rockydesert_foliage_02.cas
	rockydesert_rock_01.cas
	...
	rockydesert_rock_05.cas

Data\vegetation\
		rocky_desert_rock.vege
		rocky_desert_scrub.vege
	\textures\
		rocky_desert_foliage_01.tga.dds
		rocky_desert_rock_canopy.tga.dds
		rocky_desert_rocks_01.tga.dds
		rocky_desert_rocks_02.tga.dds
	\sprites\		
rocky_desert_rock_0.tga.dds
		rocky_desert_rock_1.tga.dds
		rocky_desert_scrub_0.tga.dds
		rocky_desert_scrub_1.tga.dds
If not, just forget it.