xB other
Faces 
{
  4B int filepos + 4
  4B int face count
  face block
  {
    4B int ?    
    1B int 46/49/4B
    1B int 51/71
    1B int 0C
    1B int block size: A = 40B, 9 = 36
    2B ?
    2B int increasing number, po 4 faces?
    4x 2B indices
    4B ????
    4x4B?
    ... until blocksize
  }
}
Vertices
{
  2B int X
  2B int Y
  2B int Z
  2B int ?
}