UV Texture + Vertex Painting

did anyone tried the walkthrough example in http://download.blender.org/demo/test/225_game_demos.zip?
How is it that the house are painted but there is no UV image anywhere?
is it vertex painting data?
the funny thing is that if I add a UV texture then both are mixed, the texture and the coloration of the walls

Sure there´s UV´s in there. I just right clicked the parts, selected UV Face Select and there they were.