XeNTaX

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Main chunks are 16 bytes long

string ID[4] forth byte is padding
int32 Offset
int32 Size
int32 Numobj only used in the texture chunk so far

the main headers ids so I've come across are:
TID = unknown, just found it
TEX = texture
AMO = model(animated model object? :P)
AHI = Bone definitions?
SDW = Animation data?

The main headers are found only at the start of the file :)

The texture chunk is arranged like this
int32 size/offset(relative)-tim2 image(compressed)-int32 size-tim2 image in other words: int32 then image
picture is compressed with I don't know what.. it dosn't do a good job and it though

the model chunk has around 30 subchunk from what I have been able to gather

The main problem with this subchunks is that the header is tiny.. only 12 bytes
with a 4 byte id that can be confused with anything...

SubHeader:
int32 Id
int32 Aux // count of subchunks or objects
int32 offset

here is a list of chunk ids from the model chunk

I have divided the headers in a must enter/ must ignore basis
this should make goinh through the file easier

Must enter(use the offset in the header or read the data)
// Note the model file is divided in objects so you will encounter many of these chunks!
TriStripData1 = 0x00030000  // Triangle strip - run length then indices(int32)
TriStripData2 = 0x00040000  // for what ever reason the chunk is sometimes divided in two.. ugly
stripTexHeader= 0x00050000  // Defines the texture the strips use, aux = numtextures
one int32 per texture, usualy just two number 0 and 1 :P
stripTexData  = 0x00060000  // strip Texture assigments, one int32 per strip Aux=numstrips
Vertex array  = 0x00070000  // 3 float x y z, Aux is the number of vertecies in the chunk
Vertex normals= 0x00080000  // 3 float x y z correspondant to the vertex array chunk
Vertex UV     = 0x000A0000  // 2 floats :) aux = numverts just as above
verts unknown = 0x000B0000  // Unknown vertex chunk four int32 aux is numverts
verts unk 2   = 0x000C0000  // bone wheight? data is inconsistent- 1 or 2 int32 + float aux=numverts
unknown chunk = 0x00100000  // aux = num??? array of int32 - appears in between verts unk2 and tristrips
unk chunk     = 0x00000009  // Aux =num chunks - Leads to matchunk unk2
matchunk unk  = 0x00130000  // look like matrices
matchunk unk2 = 0x0000000A  // UNK AUX = Num Chunks 
unk           = 0x00000000  // UNK AUX = UNK, data 3 or 2 int32
unk           = 0x000f0000
unk           = 0x00120000
unk           = 0x00020000


Must ignore(Read pass this headers, another header should follow)
AMO entry     = 0x00000001  // offset is the size of the entire model chunk
TriStripHeader= 0x00000005  // offset leads to the END of the chunk, use this if you want to read past it
unk           = 0x00000002  // offset is the reminding of the chunk
next object   = 0x00000004  // Points to the Next Object chunk(inside the model chunk)
AHI entry     = 0x0C000000  // aux = size, the ahi and the model chunk have ids with same
number but diferent use so it has to be treated diferently, good idea to stop reading here :P

these are the main headers as ints for easy comparation
(read the headers as ints)
HEADERTEX = 0x00584554
HEADERAMO = 0x004F4D41
HEADERAHI = 0x00494841
HEADERSDW = 0x00574453