This article explains what an M4R file is, how to use it on your phone or computer, and how to convert the file to another audio format.
How to Add M4R Ringtones to iPhone without iTunes 🎶
A file with the M4R file extension is an iPhone ringtone file. They can be created in iTunes and transferred to an iPhone as custom ringtone sounds.
These files are actually just .M4A files that have been renamed to .M4R. This file extension only exists to indicate that it is a ringtone.
Open M4R files with Apple's iTunes program. If they are not copy-protected, they can be played with the free VLC software and other media players, including Windows Media Player.
