This routine creates 3D contour lines from 3D points.
 It was written for Autocad 2000, so there's no guarantee
 it will work for you.
 

New Windows Version

           This program writes a comma(.csv)
         or space(.txt) separated xyz point file
       from all or any selected points in dem files
         created with the "sdts2dem.exe" program.

    ( just incase you don't have any points to contour.)