Kubotek USA makes KeyCreator (formerly CADKEY) software, and last week revealed it joined SolidWorks' Solution Partner program. That's kind of like Pro/E joing Autodesk's developer program.
Anyhow, the reason Kubotek is doing that is because they are trying to emphasize KeyCreator's ability to deal with drawings produced by many different CAD formats. And SolidWorks is fine with that. Says Kubotek:
"The reuse of data and model components from existing CAD files is a widely accepted practice but unfortunately, our recent Interoperability Survey showed that only six percent of engineers receive files in their preferred format." (I find the 6% figure way low.)