AutoCAD Temporary File
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Temporary file generated by AutoCAD, a 2D/3D drawing and design program; contains information used by various commands, such as ‘UNDO’. The files do not contain any drawing data and only exist when AutoCAD is open. They are automatically deleted when the program is closed, but may be left behind if AutoCAD crashes or is abnormally terminated.
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From PRONOM, Wikidata. Updated 2026-10-20.