Drawing Interchange File Formats
The DXF file formats are complete representations of an AutoCAD drawing that can be written and read by AutoCAD and other programs. However, programs executed by means of the external commands facility often need to supply simple geometric input to AutoCAD. For these purposes, AutoCAD supports another file format, called DXB (drawing interchange binary), which is limited in the entities it can represent.
To load a DXB file, enter the DXBIN command:
When AutoCAD prompts you, respond with the name of the file you want to load. You do not need to include a .dxb file because the type is assumed.
There is no direct AutoCAD command for writing a DXB file, but the ADI "AutoCAD file output formats" plotter driver can write such a file. If you want to create a DXB file from an AutoCAD drawing, configure the "file output formats" plotter and select its "AutoCAD DXB file" output option.