Uh... the real version supports 3DS, B3D, and X. It'd be illogical to support multiple file formats in a demo then not allow more than one in the retail copy, aye? -_-
Now give me some info. How did you make the B3D file? Expanding upon that: what program do you use for modelling? What exporter(s) do you use? Which one did you use in this case?
Now give me some info. How did you make the B3D file? Expanding upon that: what program do you use for modelling? What exporter(s) do you use? Which one did you use in this case?