.dgn file extension

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.dgn

MicroStation binary design (drawing) file.

For more information see:

www.bentley.com/en-US/Products/MicroStation/OpenDGN/ - OpenDGN Overview, includes links to the DGN file format specification.
www.bentley.com/en-US/Products/Bentley+View/Index.htm - Information and download page for the Bentley Viewer, which is a free viewer for dgn files.

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