use the DWG format which can be licensed from Autodesk or non-natively from the Open Design Alliance.

DXF files do not directly specify the units of measurement used for its coordinates and dimensions. DXF files have a HEADER section where a $INSUNITS variable may specify the intended unit (e.g., 1 for inches, 4 for millimeters). However, not all DXF files contain this information, and some software ignores it.

Most CAD systems and many vector graphics

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