texture problem on bus

Hello!

My problem is that i made the side of the bus to use the regen.tga, but its not working. I saw that the original o3d for example klappfensterxx.o3d has a lot of textures when i open in word. My o3d file has only 1. Marcell! You used multimaterial or how did you reach that the o3d has min 7 materials? Or every material has its own plane? I mean one plane for regen, copy the plane and retexture to use an other material.