What is the difference between .m4r and .otm?
- Extension
 - .m4r
 - .otm
 
- 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.
 - OTM (ODF Master Document Template) files are OpenDocument Text (ODT) templates used with LibreOffice Writer. They include the formatting, styles, text, and structure for creating a new document. OTM files can be used to create multiple documents with the same look and feel.
 
- MIME Type
 - audio/x-m4r
 - application/vnd.oasis.opendocument.template
 
- Wikipedia
 - .m4r on Wikipedia