.M21 File Extension

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Information about the file M21
  • MPEG-21 Format
  • Video Files
  • N/A

What is the M21 file?

The M21 file extension can be associated with several types of files. Most often, however, a file with such an extension is associated with the MPEG-21 Format format. M21 files are supported by Mac OS, Windows operating systems. The M21 file is one of the Video Files files, just like 546 of the other files found in our file information database.

A program that can open the M21 file is e.g. QuickTime Player. This software was released by Apple, Inc..

Programs, that can open .M21 files

Apple, Inc.
QuickTime Player
Windows
Apple, Inc.
QuickTime Player
Mac OS

How to open a .M21 file?

If you have problems opening the file M21, then in most cases the problem is only the lack of the proper application installed. Select one of the programs from the list and install it on your device. The operating system should automatically associate the M21 file format with the installed program. If not, right click on your M21 file and select from the menu "Open with" . Then select the installed program and confirm the operation. Now all M21 files should automatically open with the selected program.

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