What is the difference between .m4r and .fssd?
- Extension
 - .m4r
 - .fssd
 
- Format
 - Binary
 - Binary
 
- Category
 - Audio
 - Audio
 
- Developer
 - Apple Inc.
 - Creative Labs
 
- 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.
 - An alias for the .u8 format.
 
- MIME Type
 - audio/x-m4r
 - audio/basic
 
- Sample
 - sample.fssd
 
- Wikipedia
 - .m4r on Wikipedia
 - .fssd on Wikipedia