"Use External Binary Morph Targets: Checking this box will enable the use of External Binary Morph Targets (EBMTs) when saving new content, or resaving legacy Poser files. Saving legacy figures to the Poser Library with this option enabled will generate new .pmd EBMT files for those figures, thus allowing you to take advantage of morph target sharing, reduced file sizes, and faster processing speeds for your legacy figures." Yup! But (there's always a "but") of course, you don't want to lose your original files with all thate data, do you. So you save with the option, and keep the original (just in case)... So no disk space saved, just more taken up :-((( OTOH, save everything with the new facility, and be happy:-) (as long as you remember to delete the original stuff).. until something goes wrong. (Me, I'm a pessimist. I prefer editable text files which I might be able to cure, as opposed to compressed files that I have no way of fixing.) Cheers, Diolma