Export dxf with 3DFACE entities

Hi, 

Is there a way to export dxf file from DraftSight with 3DFACE entities included?

I have a SAT file, and was able to import it into DraftSight. It seems it maintains the surface facets as I can see them in the model window.

I need to export it as dxf file with (a bunch of) 3DFACE entities, but using exportdxf, with its several dxf versions, does not generate what I want... (it generate 3DSOLID, though.

Any advice is appreciated.

Thanks,

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Katsuhiko ISOMURA