I'm carefully comparing a .pp2 with an external geometry call and a standard Poser-created .pp2 with included geometry, and I can't see any difference outside of the GeomCustom section on the one and the section containing the objFileGeom on the other. I suspect you have a missing bracket somewhere. Poser gets real cranky about those. Also...Poser dislikes body parts that start with capitals, or spaces in file names. Hmm. Does the external mesh have an internal name? It could be Poser is opening the file, all right, but not finding the "actor" it wants.