File extension: .dwg, .dws, .dwt Developed by: Autodesk Type of format: Computer-aided design MIME: application/acad, application/x-acad, image/x-dwg DWG is a proprietary binary file format used for storing two- and three- dimensional design data and metadata. It is the native format for several CAD packages including DraftSight, AutoCAD, IntelliCAD, Caddie and Open Design Alliance compliant applications. In addition, DWG is supported non-natively by many other CAD applications.