Mac, I gave the reason in post #13 "I would be very annoyed if I loaded a set and it over wrote cameras and lights that I had spent time setting up." Say I have a light in my document with the internal name "LIGHT1" that I have set up a particular way, for a particular reason. Say you include a light in your cr2 that also has the internal name "LIGHT1", your light will overwright my light, in effect it will re-pose it. Perhaps some people don't mind this hapening, but I would rather it did not. On the other hand, if you give your light a unique internal name name, say "MacLight 1" it will not overwrite any of my existing lights, it will just add a new light to the document. Same thing applys to cameras. If you supply lights as a seperate lt2 file it does not matter, as I have the option to load it or ignor it, but if you put lights in a cr2 or pp2 I feel they should have unique internal names