What is the difference between .m4r and .odm?
- Extension
 - .m4r
 - .odm
 
- Format
 - Binary
 
- Category
 - Audio
 - Document
 
- Developer
 - Apple Inc.
 - OpenDocument Foundation
 
- 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.
 - ODM (ODF Master Document) is a file type used in OpenOffice. It is a text document that contains references to other documents, such as text documents, spreadsheets, presentations, and graphics. ODM files are used for assembling a variety of documents into a master document.
 
- MIME Type
 - audio/x-m4r
 - application/vnd.oasis.opendocument.text-master
 
- Wikipedia
 - .m4r on Wikipedia