I don't think SW outputs anything but 2D DXF.
Tom is right; if you want 3D, you will have to use Parasolid, STEP, IGES or ACIS.
Thanks guys, this is what I thought but was worth the query. We have a software package we are trialing called "CabinetVision" which we were hoping to export assemblies to and at this stage it wants a 3D dxf file. I will continue to experiment with other file formats and see if we can get it to accept something.
Do you have the Autodesk Design Suite?
the work around I know of is to use draftsight,
in solidworks export as a ACIS, in draftsight type the command "importsat"
select the sat file, save the sat file as a 3D dxf, witht the correct binary that the oposing software can open.
it should save out as a 3D dxf, to check import using SolidWorks, the import should be 3D.
Hope that helps
*as I understand saving to a 3D dxf from SolidWorks is a current limitation and there is an SPR still open for it you can only save out as a 2D dxf from SolidWorks.