What is MIME type "video/x-ms-wmx"?

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

video/x-ms-wmx is a MIME type for a Windows Media Redirector file. It does not contain the media itself. Instead, it holds instructions or pointers to streaming video content.

Files using this MIME type—often with the WMX extension—are text-based. They list one or more URLs from which the actual media, such as that in a ASF container, is streamed.

Directs media players to online streaming sources.
Works with adaptive streaming setups.
Integrates with the Windows Media ecosystem for remote media delivery.

This MIME type is part of the Windows Media technology. It streamlines the process for players like Windows Media Player to locate and stream video without needing large local files. For further insight, please see Windows Media.

Associated file extensions

.asf, .wmx

Usage Examples

HTTP Header

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


    Content-Type: video/x-ms-wmx

HTML

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


    <a href="file.dat" type="video/x-ms-wmx">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', 'video/x-ms-wmx');
      res.end('Content here');
    }).listen(3000);

Associated file extensions

.asf, .wmx

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.