How to open .MP21 file extension?

If you cannot open a new file that has been saved in the .MP21 format you need to download the appropriate software. The manufacturer of .MP21 files is N/A; .MP21 files belong to the Video Files category. After downloading the application from the list available on our website just run an unknown file, and as the default set the newly installed application supporting the .MP21 files. Activities performed in the order described should solve the problems with all the files in the .MP21 format.

• What is .MP21 file?
• How to open .MP21 file?
• What is .MP21 file?