Maybe I should have said this first: MM4 is limited in the options available for a *.cr2 There are a lot more options available for a *.pz2 As far as MM4 is concerned (and for lot of things in Poser as well) the only difference between a cr2 and a pz2 is CR or PZ . If you need the options available for a .pz2 - morph dials in body, scale channels, you just change the extension.