.dwg
File format
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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, ZWCAD, IntelliCAD, Caddie and Open Design Alliance... Wikipedia
Developed by: Autodesk, Open Design Alliance and others
Filename extension: (plain); (standards); (template)
Initial release: 1982; 42 years ago
Open format?: Open but Proprietary