A customer said that years ago - possibly back in CivilCAD day's, they could export to ACAD the Contours and not the associated DTM triangles. I said that they can convert the contours to strings. But their problem with UAV data, that they have many contours and millions of triangles (to much work to convert to strings and also deleting the triangles) and would like to Export just the Contours only with no DTM selected.
This would be useful. I had a similar request last year and I sent the whole file and they must have extracted just the contours at the their end within standard AutoCAD. Fortunately at their end the faces and contours were in different layers.