Notes about the M21 file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries
, unused processes and other unfavourable system settings to identify slowdown issues.
The M21 file type is primarily associated with 'AXMEDIS' by AxMediaTech S.R.L.. AXMEDIS tools for content processing can work with any file (audio, video, images, document, animations, HTML, SMIL, MPEG4, OMA, MXF, etc.). It can also produce MPEG-21; when an object is an MPEG-21 package it has more information of a single image or document, and as cons lost its identity in terms of simple file format. A player is available on the AXMEDIS site.