DGNLib is a small C/C++ library for reading and writing DGN files. Where can I get the source code? dgnlib-1.11.zip: Current standalone source with dgndump example mainline. Does DGNLib support all DGN elements? No, but it does support most 2D and 3
The Intergraph Standard File Formats ISFF are the file formats common to MicroStation and Intergraph’s Interactive Graphics Design System IGDS ISFF is now available to the public This enables Intergraph customers and third party developers to create