File Type MPEG-4 Audiobook File IconMPEG-4 Audiobook File
File Format Standard (developed by Apple)
Usage Referenced by an application; not meant to be opened manually; may run a program or script when opened
Rank ★ ★ ★  Common

An M4B file is similar to a .M4A file, but it is saved as an audiobook instead of a standard music file. This means it can include bookmarks and other features supported by audiobook players. The M4B format is used by the iTunes Store as the standard format for distributing downloadable audiobooks.

Info About Apple iTunes

iTunes is a media player developed by Apple. It was originally designed as an audio player, but now has many other features. iTunes supports audiobook and video playback and allows users to access the iTunes Store, which contains downloadable content. It is also the standard program used for syncing data with iPods, iPads, and iPhones.

Open With

IconApple iTunes

IconMicrosoft Windows Media Player

IconVideoLAN VLC media player


IconApple Books

Updated July 14, 2009
Information from the PC File Extensions Reference