I am trying to find an animation file for Poser of a fist being unclenched, from fist to extended. Anyone know where I can get one? Any help would be appreciated.

Sounds simple enough. Start with your beginning frame, select the hand, and turn the Grasp dial to make a fist. Then jump forward to the final frame of the animation, and turn the Grasp dial back to unclench the fist.

Using the P4 man, the default hand pose and the fist hand pose in the hands library.