MicroStation design files (.dgn) are still supported in plenty of other CAD/CAM software either by default or with the help of special plugins. You shouldn't encounter any issues with import, processing, or export of these to other formats should you need it, for example to ISO STEP product data (.stp, .step) files via dgn to stp conversion.
Home > Search converters: dgn to stp
Conversion of dgn file format to stp file format beta
Search for dgn to stp converter or software able to handle these file types.
Found 2 different conversion types using the same filename extensions.
Conversion dgn to stp type 1:
Convert from MicroStation drawing to ISO-10303 STEP product data.
Microsoft Windows software 
- convert dgn to stp on Windows
AutoCAD
Leading 2D and 3D CAD development software from Autodesk
File extension | File type (from-> to) | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|---|
Convert from dgn file | MicroStation drawing | No | No | No | No | No | Yes | No | No |
to stp file | ISO-10303 STEP product data | Yes, AutoCAD supports stp file conversion as a target file type. | Yes | Yes | stp editor | No | No | No | No |
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned dgn to stp. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Creo Parametric
A complete 3D modeling software solution by PTC
TurboCAD
A family of 2D/3D CAD software products for Windows
Solid Edge
A feature rich 3D CAD software by Siemens
Apple macOS / Mac OS X software 
- convert dgn to stp on macOS
TurboCAD for Mac
A 2D/3D CAD software for OS X
Additional links: Open dgn file, Open stp file
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Conversion dgn to stp type 2:
Convert from MicroStation drawing to Adobe Acrobat Exchange plug-in.
Microsoft Windows software - convert dgn to stp on Windows
MicroStation
A CAD software from Bentley used for 2D and 3D design and drawing
Additional links: Open dgn file, Open stp file
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