I dont know how much do u know about xbox,but here it goes:
3d file format- .cat.It doesnt contain textures.Only polygons.(the file carries 3d coordinates.Every polygon has 3 vertexes(corners).This file contains lots of polygons like that.Many polygons like that make the 3d object.The 3d object in games is covered with textures(images).But thats not important now.I hope u know that each polygon is represented in the 3d world with 3 numbers(coordinates). for x,y and z. )
Example of a 3d coordinate:
100,200,100(for x,y,z respectively).This example is just a polygon).Sorry,if u already know this
.Anyway,i can send u a .cat file like that.if u want.if u need more info,just ask.
What I wish u would do is to create a program that creates an ordinary .txt file which has the coordinates of each polygon in x,y,z.Like the 3ds ASCII files.