What is MIME type "application/x-ms-wmd"?

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

application/x-ms-wmd is a MIME type used for files in the WMD format. It does not contain the media itself. Instead, it holds instructions for media streaming and download management in Windows environments.
It tells a media player where to find the actual content. This file carries metadata like URLs and other directives needed to fetch and stream the media file from a remote server.

Primary Use: Guides Windows Media Player to locate and download streaming media.
Download Guidance: Contains metadata that helps manage how media is fetched.
Integration: Works within Windows media services to provide a seamless playback experience.

For background on MIME types, visit MIME type on Wikipedia.

Associated file extensions

.wmd

Usage Examples

HTTP Header

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


    Content-Type: application/x-ms-wmd

HTML

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


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

Associated file extensions

.wmd

FAQs

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

To ensure browsers recognize the file as a Windows Media Download package, you must set the correct MIME type. For Apache, add AddType application/x-ms-wmd .wmd to your configuration or .htaccess file. For Nginx, include application/x-ms-wmd wmd; inside your mime.types file or types block.

Why does a .wmd file open as text code in my browser?

This happens when the server fails to send the application/x-ms-wmd header, causing the browser to interpret the file as plain text or XML. To fix this, the server administrator must update the MIME type configuration so the browser knows to hand the file over to a media player like Windows Media Player.

Does a .wmd file contain the actual video or music?

No, a file with the MIME type application/x-ms-wmd is a metafile or container, not the media itself. It contains URLs, download instructions, and sometimes skin references that tell the media player where to locate and how to download the actual audio or video content.

What is the difference between .wmd and .wmv files?

A .wmv file (MIME type video/x-ms-wmv) contains actual video data, whereas a .wmd file contains instructions for downloading or streaming that content. Think of the WMD file as a "shipping manifest" or map that guides the player to the WMV destination.

Can I play application/x-ms-wmd files on non-Windows devices?

Support is limited outside of the Windows ecosystem. Since application/x-ms-wmd is designed specifically for Windows Media Player download packages, most mobile devices (Android/iOS) and Mac media players may not recognize the file structure natively without third-party tools or conversion.

Is it safe to open application/x-ms-wmd files?

generally, yes, but caution is required because these files contain scripts and URLs that redirect your media player. Always ensure you are downloading .wmd files from trusted sources to avoid redirection to malicious sites or the downloading of unwanted payloads.

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.