Hi Tom, yes if you convert any smooth curves into polylines and then export only the polyline, I would expect that the polyline should not be changed in the transfer.

re:
> Noew I built the curve like you explained, but when i export thos version as
> DXF I still get a different point number and position ?

Can you please post the .3dm model file with the curve you built in it and the DXF file you made from it that is giving you different points in it?

- Michael