What is MIME type "application/cdfv2"?

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

The MIME type application/cdfv2 identifies a binary container file format used within Windows.
It mainly stores data for Jump Lists, which the OS uses to quickly access recent or frequent items.
The format embeds metadata like file paths and identifiers in a compound structure that supports efficient data retrieval.

Main use case: Managing and displaying Windows 7 Jump Lists for faster application access.
Other uses: Facilitating internal system tasks such as maintaining usage history and aiding troubleshooting.

The file associated with this MIME type is AUTOMATICDESTINATIONS-MS.
For more details on similar compound file formats, see the Microsoft documentation.

Associated file extensions

.automaticdestinations-ms

Usage Examples

HTTP Header

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


    Content-Type: application/cdfv2

HTML

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


    <a href="file.dat" type="application/cdfv2">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/cdfv2');
      res.end('Content here');
    }).listen(3000);

Associated file extensions

.automaticdestinations-ms

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.