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Intergraph Standard File Formats (ISFF) are the file formats common to MicroStation and Intergraph's Interactive Graphics Design System (IGDS). ISFF is made available to the public, so that third-party developers could create applications for MicroStation that read and write ISFF format without a license from Intergraph.
Design files, or DGN files (*.dgn) are binary files with variable-length records for graphic elements, and non-graphic data.
Cell library files (*.cel) are binary files that store cell definitions for placement in design files.
Unfortunately, Autodesk has chosen not to support this public format in AutoCAD(2004).
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