PAR is a CAD format that generates 3D object layouts. Solid Edge, a 3D CAD system from Siemens Digital Industries Software, uses the .par extension for its part files, including their geometric forms, appearance, and structural elements.
The PAR file can be combined with other Solid Edge parts to a single assembly (ASM file).
CATPart is a native format developed by Dassault Systems for storing parts of the assemblies created in CATIA V5 software suite, which is extensively used in mechanical engineering including aerospace, automotive, shipbuilding and other domains.
CATPart stores geometry, structure and metadata of 3D models dedicated to single parts. Multiple CATPART files can be combined into a CATProduct assembly file.
Among CAD applications that support CATPart extension are Autodesk Inventor, Fusion 360, and 3ds Max.
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