Which MIME types are related to file extension ".dgn"?

The .dgn file extension is associated with 2 MIME types:

A MIME type is a string that tells browsers and other tools how to handle a particular kind of file.

About .dgn Files

DGN files are CAD drawings primarily created by Bentley MicroStation.
They usually have the MIME type application/x-bentley-dgn, which means they store detailed design data used in engineering and architecture.

Main purpose: Storing technical and construction drawings.
Usage: Widely used in building, planning, and design projects.
Software: Openable by Bentley MicroStation and compatible CAD viewers.

Some DGN files use the MIME type text/plain. This indicates a plain text format that may be associated with applications like Dragon for simple text-based content.
According to FilExt.com, the Bentley MicroStation format is the most common use for DGN files.

Relationship between file extension and MIME type

A file extension is a suffix at the end of a filename that indicates what type of file it is. File extensions help both users and operating systems identify what application should be used to open the file.

File extensions are typically separated from the filename by a period (dot) and consist of 2-4 characters, though they can be longer. For example, in the filename "document.pdf", ".pdf" is the file extension.

File extensions are closely related to MIME types, as they both serve to identify the format of a file. However, while MIME types are used primarily by web browsers and servers, file extensions are used by operating systems and applications.

Associated MIME types

application/x-bentley-dgn, text/plain

FAQs

What is a DGN file and how do I open it?

A .dgn file is a CAD design file primarily created by Bentley MicroStation. It stores 2D or 3D architectural and engineering designs. To open it, you typically use Bentley MicroStation, but you can also import it into Autodesk AutoCAD or use a free viewer like Bentley View.

Can I open DGN files in AutoCAD?

Yes, AutoCAD supports DGN files, though they are not its native format. You can import them using the DGNIMPORT command or attach them as an underlay to your current drawing. This allows for cross-compatibility between Bentley and Autodesk workflows.

How do I convert a DGN file to DWG?

The most reliable way to convert DGN to DWG is using MicroStation (via the Save As menu) or AutoCAD (via the Export function). There are also third-party conversion tools and online services, but using native CAD software ensures the best preservation of layers and geometry.

Is there a free way to view DGN files?

Yes, Bentley Systems offers a free software called Bentley View that allows you to open, view, and print DGN files without purchasing a full MicroStation license. Other multi-format CAD viewers, such as Navisworks Freedom, may also support the format.

What is the MIME type for DGN files?

The standard MIME type for MicroStation CAD drawings is application/x-bentley-dgn. However, some older or specific variants might be identified as image/vnd.dgn or even generic binary types. You can look up more details on mime-type.com.

Why does my DGN file open in a text editor?

If your .dgn file opens in Notepad, it might be a text-based file associated with Dragon or a misidentified file association. While standard CAD DGN files are binary, some systems might default to text/plain if the file header is unrecognized or if it is actually a plain text configuration file.

General FAQ

What is a MIME type?

A MIME (Multipurpose Internet Mail Extensions) type is a standard that indicates the nature and format of a document, file, or assortment of bytes. MIME types are defined and standardized in IETF's RFC 6838.

MIME types are important because they help browsers and servers understand how to process a file. When a browser receives a file from a server, it uses the MIME type to determine how to display or handle the content, whether it's an image to display, a PDF to open in a viewer, or a video to play.

MIME types consist of a type and a subtype, separated by a slash (e.g., text/html, image/jpeg, application/pdf). Some MIME types also include optional parameters.

How do I find the MIME type for a file?

You can check the file extension or use a file identification tool such as file --mime-type on the command line. Many programming languages also provide libraries to detect MIME types.

Why can one extension have multiple MIME types?

Different programs and historical usage may assign various MIME identifiers to the same file format. Listing them together helps maintain compatibility across tools.