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The file extension for cad is: "dwg" format (Autocad's standard format). DWG is a proprietary file format used by AutoCAD and AutoCAD-based software to save design data, a suite of Interact CAD software dating back to the 1970s.

Autocad file extension is:dwg format (Autocad standard format).

DWG is a proprietary file format used by AutoCAD and AutoCAD-based software to save design data, a suite of Interact CAD software dating back to the 1970s.

Autodesk licensed the file format in 1982. Autodesk owns, develops, and updates the DWG file format, which typically updates every few years as the company adds new properties to AutoCAD.

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The DWG format, and its ASCII variant DXF, has become the de facto file standard in CAD drawing data exchange, with an estimated one billion DWG files worldwide.

Several companies are reverse-engineering DWG file formats in an attempt to provide other design software with the ability to read and write DWG files. Autodesk also provides a licensed DWG technology development kit "RealDWG."

New versions of AutoCAD can open many older DWG files, and AutoCAD 2007 can open DWG files from version 2.0 and save them to version r14 format. Autodesk also provides a free DWG viewing tool called DWG TrueView for viewing all versions of DWG files.

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