problem solved... Michalis was so kind to explain to maybe.
I was a bit wrong about OBJ not supporting uv maps.
I'll explain the workflow quickly here for people who are intrested:
unwrap your object in Modo.
make an texture in gimp/photoshop.
apply it in modo.
export to OBJ.
import in blender.
export as 3ds in a different folder with the texture in the same map. Remember 3ds files can only contain 3-5 letters.
import into SU