If you mean that Vue is giving you that message, I don't know what the reasoning for it is, but Vue is wrong. I get that all the time after converting MAX files or PRJ files into 3DS, and materials always load, map, and render just fine. of course, Crossroads is pretty old, but if you're converting DXF files into 3DS, you aren't dealing with any materials anyway, since DXF doesn't have any UV mapping info in the format.