SLDPRT (SolidWorks)

The SLDPRT format is the native file format for the SolidWorks CAD application. The development of SolidWorks began in the mid-1990s by Jon Hirschtick and continues to this day.

The file format itself is a proprietary binary format representing the CAD design and all its associated components, which can be exported to many different formats, such as STL and STEP. Applications that can open SLDPRT files are currently limited to the SolidWorks application.