- Extension
- .m4b
- .opml
- Format
- Binary
- Text
- Category
- Audio
- Document
- Developer
- Apple
- Dave Winer
- Description
- It is an audiobook file compressed using .AAC algorithm based on MPEG-4 container format. It is similar to .M4A file but its denoted as an audiobook and supporting audio players can bookmark it.
- OPML (Outline Processor Markup Language) is an XML-based format used to exchange outline-structured information. It is most commonly used to share lists of web feed subscriptions (such as RSS or Atom feeds) between feed readers and aggregators.
- MIME Type
- audio/x-m4a
- text/x-opml
