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.M4B File Extension

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File TypeMPEG-4 Audio Book File

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Rare Uncommon Average Common Very Common
CategoryAudio Files


This file is saved in a binary format, which requires a specific program to read its contents.


Audiobook file based on the MPEG-4 container format; typically compressed with .AAC encoding; nearly identical to an .M4A file, but denoted as an audiobook and can be "bookmarked" by supporting audio players.

More Information

The M4B extension is used by audiobooks downloaded from the Apple iTunes store. These audiobooks may be copy-protected using Apple's FairPlay DRM, which means they can only be played on authorized computers or iPods.

Winamp can be used to play unprotected M4B files on Windows computers. However, the settings for the MPEG-4 plug-in may need to be modified to support files with an ".m4b" extension.

Programs that open M4B files
Microsoft Windows LogoWindows
Apple iTunes
Microsoft Windows Media Player
Nullsoft Winamp
Microsoft Zune
VideoLAN VLC media player
Ventis Media MediaMonkey 4
Roxio Creator NXT Pro 3
Mac OS X LogoMac
Apple iTunes
VideoLAN VLC media player
Linux LogoLinux
VideoLAN VLC media player
Updated 8/31/2015