Sorry i can't test i have not C4D!

Answer of MacGreggor ;)

the requested format is DXF, with the option Polylines otherwise we have nothing at all in C4D.
The default angle of 1 generates very close points, we can increase this value to 10 for example.

Then in C4D, we get a linear spline, perfectionists fond of precision can use Respline : but 60
https://www.alphapixel.net/respline-c4d/ (scroll)
MacGreggor

So Take Export DXF / Export Type: 3D Curves / PolyLines / Angle 10 :)
Et voila!

By MacGreggor
Modelisation Moi Render VRay