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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.
DWF is an open file format. Autodesk publishes the DWF specification and makes available C++ libraries for any developer who wants to build applications around the DWF format, with the DWF Toolkit. Furthermore, DWF is based on other industry standards such as ZLIB, XML, and common image formats.