ProStep EDMD (*.idx) files are supported by major ECAD vendors. Use this file format to collaborate with your ECAD designers on an ECAD design. You can export CircuitWorks data to ProStep EDMD files and you can import ProStep EDMD files into CircuitWorks. CircuitWorks communicates proposed changes to the ECAD files to the ECAD designer and updated changes to ProStep EDMD files are communicated back to CircuitWorks when you import the ECAD data.
To open a ProStep EDMD file, click , navigate to the ProStep EDMD file and click Open. To set the ProStep EDMD options, in the CircuitWorks Options dialog box, click the ProStep EDMD
tab.

See SolidWorks Help: ProStep EDMD Files.