What is MIME type "application/vnd.groove-tool-message"?

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

application/vnd.groove-tool-message is a vendor-specific MIME type. It is used by Microsoft's Groove tool. Files of this type store messages and related metadata. They typically use the extension GTM.

This format is designed to package a structured message for collaboration. The MIME type helps software recognize and process these files correctly. It ensures that message content and internal links are preserved during sharing across a network.

Collaboration – Stores messages exchanged in a team environment.
Data Structure – Encapsulates message content with metadata.
Integration – Allows messages to be part of a larger set of interactive documents in a workspace.
Interoperability – Ensures that Groove-compatible software can read and display the message correctly.

For more technical details, visit the IANA registry entry.

Associated file extensions

.gtm

Usage Examples

HTTP Header

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


    Content-Type: application/vnd.groove-tool-message

HTML

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


    <a href="file.dat" type="application/vnd.groove-tool-message">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.groove-tool-message');
      res.end('Content here');
    }).listen(3000);

Associated file extensions

.gtm

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.