XeNTaX

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file name: c00001.rmb (assuming rmb = model and rab = animation)
DWORD unknown1[6]; // sample file had the first 24 bytes set to 0
DWORD textureCount; // (?) value was 1 - total count for all model/objects in file?
DWORD modelCount; // (?) value was 1 - total count for all model/objects in file?
DWORD boneCount; // value was 9 and matches the number of "Bone##" entries in the .rab file. also position 0x1C had the value of 9 in the .rab file so I'm assuming this is correct. 
DWORD dataOffset; // this should be correct as well.
char textureFilename[260]; // file name is 0 terminated and then padded to fit at least 260 bytes (which is the maximum length for a path in Windows)
DWORD unknown2[2]; // no idea what this means, could be file padding, file had the following values: 0x00000000 and 0xFFFFFFFF

// file position: 0x130, contains the word "Box03", will get back to this later since I'm currently at work
char objName[64]; // name/reference or something, 64 bytes long, mainly filled with 0's
char name[64]; // same as above, has the name 'root' but that appears multiple times up to the dataOffset value
DWORD unknown3[2]; // (?) could be the modelCount/textureCount like above for this model/object?
DWORD vertexCount; // should be correct as well
DWORD indexCount; // should be correct

// position 0x1C0 to 0x670 is filled with zeros (no idea why or what this means)
DWORD indexCouint; // again the value is here...

// next 396 bytes are all 0 as well...
DWORD vertexCount; // again the value is here...

// 400 bytes later we get to a value of 0xFFFFFFFF
// now at position 0x998
DWORD count; // no idea. file had the value of 4
DWORD values[count]; // assuming the previous 'count' value means the number of values in some kind of DWORD array. file contained the following values: 1, 2, 5, 8

// 64 bytes later...
// file position 0x9EC
// Bone information!
struct Bone[boneCount] {
    char name[64]; // name of bone
    char parent[64]; // name of parent
    float4x4 matrixInfo[3]; // 3 4x4 matrix structures (pos, scale, rot?)
    DWORD childCount; // ?, possible... or index
    DWORD childrenIndex[]; // something like this
} // this structure is still a bit confusing to me, but I do see some patterns

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struct vertex {
    float data[14]; // I don't know the exact structure. yet...
} 

vertex vertices[vertexCount]; 

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struct boneWeights {
    float weights[4]; // bone weights? only saw 3 values: 0, 1, 0.5
}

boneWeights weights[vertexCount];

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WORD indices[indexCount];