There's no Md5 import, isn't it ?
I would like to create one, I'm looking into AseToJme and if I did not understood wrong I have to generate some Trimesh.
Md5 is ascii format (that's why I'm started with Ase converter) and inside there's definition for :
joints
There is MD5 Reader 2 download | SourceForge.net and if you search the forum you found threads about it.