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Why DXF Is Best. Essentially, the main difference between the two files is that DWG files is proprietary to AutoCAD, while DXF is an exchange file created for non-AutoCAD applications to write a similar file type.
What is a SDF file? SDF is an acronym for Standard Database Format. Files that contain the .sdf file extension normally contain standard database files that store data in a structured file format. These SDF files are often used to transfer data between different database applications.