20260318-0 DGN DGN 2021-08-27 2000-01-01 DGN 2021-09-16 2021-09-01 DGN file A DGN file is a 2D/3D drawing created by various construction CAD software, such as MicroStation and Intergraph Interactive Graphics Design System. It may be saved in one of two formats, either the Intergraph Standard File Format (ISFF) or the newer V8 DGN standard. DGN files are typically used to save designs for construction projects for highways, bridges, and buildings. application/octet-stream .dgn DGN false DGN 2000-01-01 DGN