XeNTaX

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char[3]	header	//MSH
dword	nFaces	//Face count
word	nmtl	//Material count
struct face {
 byte X 3	uknByte	//should be 1 byte for each vert
 dword X 3	uknLong	//should be 1 value for each vert
 float X 3 	vert1	//position x, y, z
 float X 3 	vert2	//position x, y, z
 float X 3 	vert3	//position x, y, z
 float X 2 	uv1	//texture coordinate u, v
 float X 2 	uv2	//texture coordinate u, v
 float X 2 	uv3	//texture coordinate u, v
 float X 3 	norl1	//normal x, y, z ?
 float X 3 	norl2	//normal x, y, z ?
 float X 3 	norl3	//normal x, y, z ?
 float X 3	??
 float X 3	??
 float X 3	??
} face[nFaces]
struct Material {
 float X 3	colAmbient	//color r g b
 float X 3	colDiffuse	//color r g b
 float X 3	colSpecular	//color r g b
 char[]	textureName
 dword	ukn
 byte X 8	ukn2
}

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.ani should be animation file
char[3]		header	//ANI
dword		nFrames	//Frames count / ?? not sure maybe Bones
dword		nBones	//Bones count \ ?? not sure maybe Frames
struct translation {
 float X 3		PosXYZ
 float X 4		QuatXYZW
}	// total nBones * nFrames

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.abx is mesh file use vertices deform for animation
char[3]		header	//AX2
dword		nFrames	//Framescount 
dword		nVerts	//Verts count
struct Vertpool {
 float X 7		??
} Vertpool[nVerts]
dword		ukn	//0xFFFFFFFF ?? terminator
struct faceIndex {
 dword		//maybe tri-strip ?? don't know the face count
}

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I don't know what mbx is?
char[3]		header	//MX2
dword		??
dword		nukn	//unknown count
byte		??
struct Section1 {
 dword		??
 dword		??
 float		??
} Section1[nukn]
struct Section2 {
 float X 3		??
} Section2[nukn]
dword		nukn2	//unknown count 2
struct Section3 {
 float X 3		??
} Section3[nukn2]
dword		nukn3	//unknown count 3
struct Section4 {
 float X 2		??
} Section4[nukn3]
dword		nukn4	//unknown count 4
struct Section4 {
 dword		ntxt	//length of texture's name
 char[ntxt]		stex	//texture's name
 byte X 72		??
} Section4[nukn3]

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MBX version 1 INFO

char[3]      header   //MX1
dword X 6    ??
byte X 1     ??
dword   nFaces        //Face count
struct face {
 dword        ntxt    //length of texture's name
 char[ntxt]   stex    //texture's name
 dword X 3    ??
 float X 2    uv1     //texture coordinate u, v
 float X 2    uv2     //texture coordinate u, v
 float X 2    uv3     //texture coordinate u, v
 float X 3    ??
 float X 3    ??
 float X 3    ??
 float X 3    norl1   //normal x, y, z
 float X 3    norl2   //normal x, y, z
 float X 3    norl3   //normal x, y, z
 float X 3    vert1   //position x, y, z
 float X 3    vert2   //position x, y, z
 float X 3    vert3   //position x, y, z
} face[nFaces]

------------------------------------------------------------------
MBX version 2 INFO

char[3]      header   //MX2

other than that... format unknown... :-\

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char[3]      header   //MX1 
float X 6    bbox     //bounding box [x,y,z] [x,y,z]
byte X 1     padbyte  //no use??
dword        nFaces   //Face count 
struct face { 
 dword        nshd    //length of shader name 
 char[nshd]   sshd    //shader name 
 dword X 3    boneidx //Bone index(should have external bones file as well) 
 float X 2    uv1     //texture coordinate u, v 
 float X 2    uv2     //texture coordinate u, v 
 float X 2    uv3     //texture coordinate u, v 
 float X 3    vc1     //Vert color  r g b
 float X 3    vc2     //Vert color  r g b
 float X 3    vc3     //Vert color  r g b
 float X 3    norl1   //normal x, y, z 
 float X 3    norl2   //normal x, y, z 
 float X 3    norl3   //normal x, y, z 
 float X 3    vert1   //position x, y, z 
 float X 3    vert2   //position x, y, z 
 float X 3    vert3   //position x, y, z 
} face[nFaces] 

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char[3]    header   //AX1
dword      ukn      //??
dword      nFrames  //Frames count 
dword      nVerts   //Verts count 
struct FrameMeshVerts {
 struct Vertpool { 
  float X 3       //position xyz
  dword      ??   //not sure if it is dword
  float      ??
  dword      ??   //not sure if it is dword
  float      ??
 } Vertpool[nVerts] 
} FrameMeshVerts[nFrames]
dword      ukn   //0xFFFFFFFF ?? terminator 
struct face { 
 dword      idx1
 dword      idx2
 dword      idx3
}

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char[3]    header   // AX1 
dword      padding  // always 0s?
dword      nFrames  // Frames count
dword      nBones   // Bones count
struct animation {
  struct translation { 
    float X 3      PosXYZ 
    float X 4      QuatXYZW 
  } translation[nBones]
} animation[nFrames]
dword      ??       // seems to be FFFFFFFF all the time...
struct boneidx {
 dword          pBone  // my guess this is the bone structure
} boneidx[nBones]