The tools listed on this page:
<a href="http://www.expertgps.com/convert.asp">http://www.expertgps.com/convert.asp</a> might prove to be helpful.
This will allow you to access ArcGIS Files through AutoCAD: <a href="http://www.esri.com/news/arcnews/fall07articles/new-arcgis-for-autocad.html">http://www.esri.com/news/arcnews/fall07articles/new-arcgis-for-autocad.html</a>
This is a PDF from an old class, there is contact information in it that you might find helpful:
Last Wiki Answer Submitted: September 9, 2008 8:20 pm by Flame14,895 pts.