Version differences

MATERIAL - added specular color and glossiness, colors are vector4
FRAME - scale and rotation swapped, different quat, extra field in HD2
SECTOR - min, max come before vertex and face data, HD2 vector4
DUMMY - HD2 vector4
TARGET - no change
JOINT - removed matrix
OCCLUDER - HD2 vector4
MESH - no change
LOD - numExtraData, extraData
FACEGROUP - no change
VERTEX - no change

SKIN - the most different of all see (skin)
MORPH - only min and max is vector4 in HD2
BILLBOARD - no changes
GLOW - extra float
MIRROR - HD2 vector4