What is MIME type "application/x-os2-msg"?

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

application/x-os2-msg is a custom MIME type. It marks files used for OS/2 help messages. This type tells the system how to process and display the file's content. In essence, it wraps help documentation and instructions inside the OS/2 operating system.

Files with this MIME type are mainly used to deliver in-app help or support information. They include user guidance, error explanations, and general documentation.

• Main use case: Serves as the format for OS/2 help messages.
• Other uses: Provides interface assistance in legacy applications; supports internal documentation.
• File association: It is linked to files like MSG.

Though OS/2 is an older operating system, knowing about this MIME type helps understand how help systems were implemented in specialized environments. For more technical context on MIME types, you may visit MIME types on MDN.

Associated file extensions

.msg

Usage Examples

HTTP Header

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

    Content-Type: application/x-os2-msg
  

HTML

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

    <a href="file.dat" type="application/x-os2-msg">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-os2-msg');
      res.end('Content here');
    }).listen(3000);
  

Associated file extensions

.msg