What is MIME type "application/x-stuffitx"?

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

application/x-stuffitx is a MIME type for archived files made with the StuffIt compression format. It indicates that the file holds bundled data that has been compressed.
Files in this format, like SITX, are used to store and share multiple items in one package.

Main use case: Efficient archival and compression of data.
Distribution of bundled files.
Backup and storage of file collections.
Transfer of software packages and related content.

Functionality: The type signals to compatible programs, such as StuffIt Expander, that the file should be decompressed to access its contents. This approach was popular on Mac systems and still finds use on PCs for handling legacy archives.
For more details, visit Filext.

Associated file extensions

.sitx

Usage Examples

HTTP Header

When serving content with this MIME type, set the Content-Type header:


    Content-Type: application/x-stuffitx

HTML

In HTML, you can specify the MIME type in various elements:


    <a href="file.dat" type="application/x-stuffitx">Download file</a>

Server-side (Node.js)

Setting the Content-Type header in Node.js:


    const http = require('http');    
    
    http.createServer((req, res) => {    
      res.setHeader('Content-Type', 'application/x-stuffitx');    
      res.end('Content here');    
    }).listen(3000);

Associated file extensions

.sitx

FAQs

What is the application/x-stuffitx MIME type used for?

The MIME type application/x-stuffitx represents archives compressed using the StuffIt X format. These files, typically ending in .sitx, offer higher compression ratios and stronger encryption compared to the legacy .sit format.

Which software can open application/x-stuffitx files?

You primarily need StuffIt Expander (available for Mac and Windows) to decompress these files. On macOS, third-party utilities like The Unarchiver can often handle this MIME type, but the official StuffIt software ensures full compatibility with all compression features.

How do I configure a web server to serve .sitx files correctly?

To ensure browsers recognize the file as a StuffIt X archive, add the MIME type to your server configuration. For Apache, use AddType application/x-stuffitx .sitx in your .htaccess file. For Nginx, add application/x-stuffitx sitx; to your mime.types file.

What is the difference between application/x-stuffit and application/x-stuffitx?

application/x-stuffit is used for legacy StuffIt archives (extension .sit), while application/x-stuffitx is for the newer StuffIt X format (extension .sitx). The newer format supports larger file sizes, better compression methods, and long filenames, making it distinct from the older standard.

Can I open application/x-stuffitx files on Windows?

Yes, although the format is historically associated with Macintosh systems, you can open these files on Windows using StuffIt Expander for Windows. Some multi-format archive tools may not support .sitx due to its proprietary compression algorithms, so the official tool is recommended.

Why does my browser download the file instead of opening it?

Browsers do not have built-in support for decompressing application/x-stuffitx archives. When a server sends this MIME type, the browser defaults to downloading the file so you can open it locally with a dedicated utility like StuffIt Expander.

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 are multiple MIME types listed for one extension?

Different applications and historical conventions may use alternative MIME identifiers for the same kind of file. Showing them all helps ensure compatibility across systems.