How to Load Amc files in biped

hello sir,
              i have two queries in motion capture topic.

              1. i want to know how to Load "AMC" files in biped .
              2. when i m using BVH format in biped then my biped size is change
and spine in Bvh file is used only 2 but in my structure i want 4 spine. and  i
m saving the figure file and when i m using that figure file to