Are you kidding me? Can it possibly be slower than Inventor in opening assembly files? YES. Oh, and it's so intuitive...NOT. Can I search where a file is used before I change it's name? You better...but you better go get lunch if you want it to search for drawings, assys, or presentations where the part might be used. Am I better off just changing the filename and then resolving everything manually? You bet! No wonder it's a freebie!