What is a dgn file and how do I open a dgn file?

2D/3D drawing format used by MicroStation construction design software; based on either the Intergraph Standard File Format (ISFF) or the newer V8 DGN standard; can be converted to the more universal .DWG format by AutoCAD LDT.
DGN files can be opened by Bentley Systems MicroStation or the free Bentley View program.  The DGN format is also supported by several other third-party programs.
The DGN extension is short for "design."

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