.M21 File

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.

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.

How to open:

Use compatible tools to work with *.m21 files.

How to convert:

Probably can be converted to other formats.