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Yes, R14 from way back in ancient times.  I was in the engineering/land surveying business and wrote my own software to use in the business.  I never upgraded because R14 would do everything I needed, and I did not care for AutoDesk's later licensing policies.  The later (visual?) LISP will not run on my R14. Anyway I have attached another drawing that has two polylines.   The red pline is one that I created and LISTs as a POLYLINE with the same elevation at each vertex.  The blue polyline is a copy of the red polyline and I converted it with CONVERTPOLY to a LWPOLYLINE.  If I draw a polyline with the 3DPOLY command, you are correct in that it will not convert. The previous drawing that I posted was not created by an AutoDesk product, and I am trying to figure out how to convert it to LWPOLYLINES without having to explode, pedit, join.