Kay: yes you can delete the BUM files, but only after you have changed all your CR2 references over to the JPG versions. You can do it one of two ways: In Poser, open each and every old Prop, Character, Hair, etc. And look to see if it is using a BUM file for it's bump map. If it is then change this to the JPG or other file format usable by poser. Once they are all changed you can delete all those BUM files. Outside of poser. This is my plan. I'm going to use the windows search to run through the Poser Runtime folder and find all files that have the string ".bum" in them. I will then open them in a text editor and change that string to the extension of the bump map if there is a second file used to let Poser generate the BUM. Keep in mind that without Pro-Pack, poser will always convert files to BUM when they are loaded into the bump channel. Once I get all those files changed I will do a mass delete on any and all BUM files I find under the Poser Directory. Keep in mind that this is a plan and I haven't yet done this so you may want to hold off until you find out if it works for me or not.