M21 File: What is it?

Author:   |   Last Updated: November 27, 2018

Microsoft Silver

M21 File Summary

Two known software programs (notably, Apple QuickTime Player developed by Apple) are related to the M21 file extension. In addition, they are categorized under a single primary file type, described as the AXMEDIS MPEG-21 File format. The majority of M21 files are considered Video Files.

We have found M21 files on the Windows and Mac operating systems. They are both mobile and desktop device friendly. With a Popularity Rating of "Low", these files are not very common to your average computer user.

If you would like to learn more about M21 files and the software that opens them, please see the additional detailed information below. Also, you can learn how to do some basic M21 file troubleshooting if you are having trouble opening these files.

Low
Popularity
6709
File Rank

/ 11690

Active

Mode

27

November

2018

Edited

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Varieties of M21 Files


Main M21 Affiliation

.M21
File ID:.m21
Group:AXMEDIS MPEG-21 File

AXMEDIS MPEG-21 File is saved in a packaged content distribution format. It contains various types of media, descriptive meta-data, and DRM copy-protection information.

Company: AXMEDIS Products and Services
Class:Video Files
Subkey: HKEY_CLASSES_ROOT\.m21

Software Programs That Open The AXMEDIS MPEG-21 File:


Apple QuickTime Player by Apple

Windows
Mac

AXMEDIS Editor by AXMEDIS Products and Services

Windows

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M21 File Popularity


Leading Device Types

Desktop (84.34%)
Mobile (14.29%)
Tablet (1.37%)


M21 File Complications


Frequent M21 Opening Issues

Missing Apple QuickTime Player

If you attempt to load your M21 file, you experience a message such as "Can't Open M21 Files". If this is the case, it's usually due to the fact that you do not have Apple QuickTime Player for %%os%% installed on your computer. The typical path of opening your M21 with a double-click won't work because %%os%% cannot make the program connection.


Tip: When another M21 application is installed, you can choose to open it by selecting "Show Apps" and using that program.


Apple QuickTime Player is Out-of-Date

In some cases, you might have a newer (or older) version of a AXMEDIS MPEG-21 File file that is unsupported by your installed application version. You will need to download a newer version of Apple QuickTime Player if you don't have the right version. The primary cause of this problem is that your AXMEDIS MPEG-21 File file was created by a different (newer) version of Apple QuickTime Player than what's installed.


Tip: Find clues on the correct software version by right-clicking your M21 file and clicking "Properties".


Regardless, most of the M21 file opening problems relate to not having the right version of Apple QuickTime Player installed.


Other Causes of M21 File Opening Problems

Errors opening AXMEDIS MPEG-21 File files can still occur even with the latest Apple QuickTime Player software installed on your computer. Other M21 opening errors can be created by other system problems inside of %%os%%. These issues include:

  • File references in the Windows Registry for M21 are wrong
  • Unintentional removal of the description of the M21 file inside the Windows Registry
  • Apple QuickTime Player or another M21 application experienced a flawed installation
  • M21 file corruption
  • The M21 is infected with a virus
  • Device drivers of the hardware associated with your M21 file are corrupt or out-of-date
  • Too many applications are open on your PC to load your AXMEDIS MPEG-21 File file successfully

Quiz: What file extension is not associated with Microsoft Office?








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