What is MIME type "application/vnd.ms-excel.addin.macroenabled.12"?

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

application/vnd.ms-excel.addin.macroenabled.12 is the MIME type for a macro-enabled Excel add-in. It is used by Microsoft Excel to load extra functionality from add-ins in a secure and organized way. This file type uses the Office Open XML standard and is saved with the file extension XLAM.

Excel add-ins provide custom commands, automated routines, and extra functions by running built-in code (macros). The format allows the software to expand Excel's capabilities significantly.
The MIME type tells applications exactly how to handle these files, ensuring that Excel loads and validates the add-in appropriately.

• Automation: Executes VBA macros to automate repetitive tasks.
• Extended functionality: Provides additional features like custom formulas and toolbars.
• Integration: Works smoothly with other Office Open XML-based files and systems.

This MIME type plays an important role in file identification and security. It helps protect systems by signaling that the file contains executable code that should be handled with caution.
For more detailed information on Excel add-ins, check out Microsoft’s documentation.

Associated file extensions

.xlam

Usage Examples

HTTP Header

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

    Content-Type: application/vnd.ms-excel.addin.macroenabled.12
  

HTML

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

    <a href="file.dat" type="application/vnd.ms-excel.addin.macroenabled.12">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/vnd.ms-excel.addin.macroenabled.12');
      res.end('Content here');
    }).listen(3000);
  

Associated file extensions

.xlam