What is the difference between .m4r and .vms?
- Extension
 - .m4r
 - .vms
 
- Format
 - Binary
 - Binary
 
- Category
 - Audio
 - Audio
 
- Developer
 - Apple Inc.
 - VoidMail
 
- Description
 - M4R is an iTunes ringtone file that stores mono channel audio. They are identical to the M4A format files only that they are correctly used for ringtones.
 - Used in Germany to compress speech audio for voice mail. A self-describing variant of cvsd (Continuously Variable Slope Delta modulation).
 
- MIME Type
 - audio/x-m4r
 - audio/x-vms-compressed-void-mail
 
- Sample
 - sample.vms
 
- Wikipedia
 - .m4r on Wikipedia