M4B is a file extension for a MPEG-4 part 14 audio layer audio book container file format used by iTunes. An M4B file is very similar to an M4A file but specified for audio books.
M4B files support metadata for chapters and bookmarking on supporting players and most commonly uses AAC (Advanced Audio Codec).
Programs that can open M4B files include iTunes, Windows Media Player and Roxio Creator.
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