Wrong file. The critical data is in the .obj file, usually found in a subfolder under Geometries, but at least you don't need to mess around with a text editor, though you can do it that way. I have done. I used to post to the Fidonet DOS batch file echo. Take it as read that I'm weird. You can do it in Poser or in UVmapper, and you'll end up with a fresh version of the .obj file, and you'll have to edit the .cr2 to point it at the correct file. Poser first: Import the .obj file and open the grouping tool. You have to create a new group, but this is only temporary. You'll see two buttons: "Add Material" adds a material to the group. "Assign Material" makes the group a part of that material. Before you exit the grouping tool, delete your temporary group. You then export the mesh under a new filename. You should only have the "include existing groups" box ticked. UVmapper is similar. Load the model. You don't need to do anything with a dummmy group, just Select, By Material, and then Assign, To Material. Save the model when finished. It's possible that a .cr2 will do something clever, geometry switching and such, but there are usually just two lines which point at the geometry. When I've done this sort of thing, I've just added something to the filename, so that "foobar.obj" becomes "foobaru2.obj", which is easy to edit. Don't forget to save the .cr2 under a new name. If you're just changing a material name, rather than combining materials, you can do that as well, it's tidier. You'll then see the shrugging man symbol for the new version. You can have a Material in the .cr2, and it will appear in the Materials Room, but if there isn't a Material in the .obj file it won't do anything.