MySketchUp should be able to open/edit/save and/or import/export COLLADA (dae) files

Technical Problems SketchUp for Web
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of course but not as an industry standard for exchanging 3D CAD data where STEP, Acis SAT or IGES (decreasing) is used for.

btw. the NURBS surfaces/solids of the DWG/DXF format are based on embeddeing Acis data typically in an old revision.