I had no idea there was an Orc addon for MCFS. Are you sure that's what it's for, rather than a morph/texture pack for Michael? Anyway, if you need to convert .jpgs to .bum, load a primative prop, like the sphere from the default Props library. Go into the Materials editor, assign the .jpg version of the bump map(s) you'll need for the actual item. You'll get a dialogue box asking if you want to convert. Choose "yes," and you're good to go. If you'd mistakenly applied .jpg versions of bump maps, you may have to edit the MAT file (using something like Windows' NotePad) to change bump map references from the .jpg files to the correct .bmp files. This is very easy to do. Use the "find" feature in Notepad with keyword "bump" to quickly scroll through the file to find all references. Otherwise, you can use an image editing app to convert the .jpgs to .bmp files. Then, change the extension to .bum. That's about it. As I understand, ProPack doesn't need to convert to .bum. It reads .jpg bump maps just fine, so this is a strange problem you're having. Good luck, though! This isn't a problem with DAZ' stuff, technically speaking. If you disagree, I'd suggest writing to them directly.