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

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

application/vnd.ms-outlook, application/octet-stream.

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

About .nst Files

NST files are used in two distinct ways. One use is as a Personal Folder File for Microsoft Outlook, and the other is as a savestate file for the Nestopia emulator.

When used as a Personal Folder File, NST files help store emails, contacts, calendars, and other user data. They carry the MIME type application/vnd.ms-outlook and serve as storage containers for offline data. To view or edit these files, you can use Microsoft Outlook or other compatible email programs.

Use Case: Archiving and managing personal email data
Key Fact: They store important user information for offline access

Alternatively, NST files are also used to save the state of a game in the Nestopia emulator. Under the generic MIME type application/octet-stream, these files capture a snapshot of a game’s current progress so you can return to the same moment later. This function is built into the Nestopia emulator, allowing you to resume play easily.

Use Case: Saving a snapshot of an ongoing game
Key Fact: They store binary data that records the complete game state

Based on information from FilExt.com, the same NST extension serves two very different purposes. Use the appropriate software—Microsoft Outlook for personal folder files and the Nestopia emulator for game savestates—to work with these files properly.

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/vnd.ms-outlook, application/octet-stream

FAQs

What is an NST file?

An NST file primarily serves two different purposes. It is most commonly associated with Microsoft Outlook as a storage container for Office 365 Groups or the Connector for Lotus Notes. Alternatively, it is used by the Nestopia emulator to store saved game states.

How do I open an NST file created by Outlook?

You generally cannot open an NST file directly via the File > Open menu in Microsoft Outlook. These files act as a local cache for Office 365 Groups. To view the contents, ensure your email account is synced properly in Outlook, or use third-party conversion tools to convert the NST data into a readable PST format.

How do I load an NST file in Nestopia?

To use an NST file with the Nestopia emulator, launch the emulator and open the corresponding game ROM first. Then, navigate to the File or Save State menu and select Load State, browsing for your .nst file to resume your game exactly where you left off.

Can I convert an Outlook NST file to PST?

Yes, converting an NST file to PST is often necessary to back up or migrate data from Office 365 Groups. While there is no built-in converter in Outlook, many third-party utilities can perform this conversion. Some users also attempt renaming the extension to .ost to repair it with Outlook tools, though this is less reliable.

Is it safe to delete an Outlook NST file?

In most cases, yes. If the NST file is generated by Microsoft Outlook for Office 365 Groups, it functions as a local cache similar to an OST file. If you delete it, Outlook will typically recreate and resync the file from the server the next time you access that group, provided you have an active internet connection.

What happens if I try to open a Nestopia NST file in Outlook?

It will fail to open and may display an error message stating the file is corrupt or not a valid personal folders file. Since the Nestopia save state contains binary game data (MIME type application/octet-stream), it is completely incompatible with the structure expected by Microsoft Outlook.

What are the correct MIME types for NST files?

When associated with email data, the correct MIME type is application/vnd.ms-outlook. For emulator save states, the file is treated as generic binary data with the type application/octet-stream. You can verify MIME configurations at mime-type.com.

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.