No, they're not library files at all, but free-standing programs that let you preview separate eye and mouth expressions. When you get the combination you want, copy to the system clipboard by clicking on a button. In Poser, select the figure's head and paste. I developed the first one (for P4FemMagic) because my face library was getting unmanageable, and all the combinations I was making were impossible to find. Since I have a lot of experience coding Director, I decided to work on a solution outside Poser. Then folks asked for ones for the Millennium figures and they've been fairly popular :-) Elisa/gryffnn