An m21 file extension is related to the MPEG-21 standard created by the Moving Picture Experts Group that defines a normative open framework for end-to-end multimedia creation, delivery and consumption.

Detailed description

Software that works with m21 file extension

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M21 file - MPEG-21 video data

What is m21 file? How to open m21 files?

File type specification:

Digital video and movie file type icon Digital video and movie file type

The m21 file extension is associated with the MPEG-21, a standard created by the Moving Picture Experts Group that defines a normative open framework for end-to-end multimedia creation, delivery and consumption.

The m21 file stores video data.

This m21 file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.

Updated: June 25, 2018

The default software associated to m21 file type:

QuickTime Player for Mac icon

Apple, Inc. logoQuickTime Player for Mac  Apple macOS / Mac OS X software

Company or developer:
Apple, Inc.

QuickTime Player is a native part of Apple's Mac OS X and macOS operating system. QuickTime Player is a great application for playing media content, including HD (high definition) video and supports many modern codecs and file formats.

Help how to open:

Use compatible tools to work with *.m21 files.

How to convert:

Probably can be converted to other formats.

Related links:

MPEG-21 Overview

List of recommended software applications associated to the .m21 file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open m21 file, edit m21 file, convert m21 file, view m21 file, play m21 file etc. (if exist software for corresponding action in File-Extensions.org's database).

  • Play m21 file

m21 file player - programs that play m21 file - MPEG-21 video data

Programs supporting the exension m21 on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about QuickTime Player for Mac for play m21 file action.

Apple macOS / Mac OS X:

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