bushi, thanks for correcting yourself. Pro-pack does not use RSR files except in these cases: THe OBJ geometry file does not exist but the RSR for the geometry does. Converting this to an OBJ file will cause Pro-Pack to use the OBJ file and ignore the RSR files. When first opening a library, any items that do not have a PNG thumbnail will be checked for an RSR thumbnail. If the RSR thumbnail is found then it is converted to PNG and the PNG is loaded. THe RSR thumbnail is later ignored. Now I did a few tests here. FOr the thumbnails I have found that it isn't really worth going through them and deleting. My average space savings here was about 1 or 2 percent. These RSR files are fairly small. For the Geometry RSR's it is advantagous to remove these. After verifying that I had all the appropriate OBJ files I deleted the RSR's for these OBJ's. Disk space difference for my geometries folder dropped by 30%. Hope that helps you make another decision.