2 things: First Ajax is right! It's only when you modify .obj in geometries dir that you will have to delete it's corresponding .rsr file! That would for example happen, if you modify the geometry in UVMapper... With Poser4, until the .obj is actually reference at least once, there won't be a .rsr file to go with it!(Unless it was already supplied!). second, i think that using proPack, it doesn't create .rsr for the .obj(Since, i don't have ProPack, i cannot confirm this). As for the .rsr(in the libraries), they are just "Thumbs"! With ProPack, they are replaced by .png files(probably to make it compatible with Macs???). And, since .rsr are basically .png files. It would explain the size differenc with a .jpg! JPGs are better at compression... Tada! Anik & Marco