.DXX File Extension
AutoCAD Drawing Interchange Attribute File
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What is a DXX file?
Data file created by AutoCAD, an application used for creating 3D design drawings; may contain drawing block reference, attribute, and end-of-sequence objects; can only store a subset of information that can be saved in a .DXF file.
DXX files are used for extracting smaller amounts of information from a drawing that can be used interchangeably with other CAD applications.