I made a region by two entities and save it as R12 Binary Drawing(.dxf) format in DraftSight.

After some time, I re-open the dxf file the region which I created becomes converted to polyfacemesh.

It is specifically happening for R12 Binary Drawing(.dxf).

The machine for nesting operation which I have, runs only on input in R12 Binary Drawing(.dxf) format.

How can I rectify this problem?

Is anyone having solution or workaround? Kindly help me.