MS3D
From GDWiki
The native file format for Milkshape 3D-models is the ms3d-format. This file format is structured in the following way:
* Header
o "MS3D000000" followed by version number (ver. 3 or 4)
* Vertex Data
o Coordinates for the vertices
* Triangle Data
o Pointers to vertices, as well as surface normals
* Group Data (object/mesh)
o Group name and pointers to triangles
* Material Data
o Color details
* Bone data
o Animation data
More details here:
http://local.wasp.uwa.edu.au/~pbourke/dataformats/ms3d/

