Hi, my name is Cristian, im from Argentina and i don´t know speak english.
I ported the files whit extension .iges to .obj (weavefront)
Now, you can see the files in 3D Visor, or edit in blender for example.
(i don´t know how to use Autocad)
Download Files:
https://mega.nz/#!ZlIlnYwS!8dauIOrcZ4Wa4dvDdK4xOLvkRfL82sOnNAp2P64eNEs
Simple Visor Free:
open3mod
Blender Free Software:
Blender