AutoCAD's native file format, DWG, and to a lesser extent, its interchange file format, DXF, have become de facto standards for CAD data interoperability. AutoCAD in recent years has included support for DWF, a format developed and promoted by Autodesk for publishing CAD data. In 2006, Autodesk estimated the number of active DWG files to be in excess of one billion.
The current AutoCAD file format (.dwfx) is based on ISO/IEC 29500-2:2008 Open Packaging Convention.[3]
In the past, Autodesk has estimated the total number of DWG files in existence to be more than three billion.
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