help in exporting biped animation

hi there, want to ask something about exporting biped in 3ds max.

I'm currently using max 7 and I can't find a solution to export biped. I try converting physique to skin and export as b3d format, but nothing comes out. I tried exporting the mesh as fbx format and tried re-importing it back, but nothing shows up either. anyone knows how?

thanks alot!