M4B file is an Audio book file; downloaded from the Apple iTunes or Windows Audio Media player. M4B files can be opened and bookmarked with compatible audio programs such as Apple iTunes, Windows Media Player and VLC Media Player.
File extension errors generally occur when the appropriate program is not installed in your system. Scan your system to identify and fix M4B file extension errors.
Trouble opening M4B files on Microsoft Windows?
Advanced File Optimizer
Need help opening a M4B file? Advanced File Optimizer will do this for you. Opening a M4B file only takes a few clicks and is very easy, even for novice users.
Compatible with Window XP, Vista, 7, 8, 8.1 and 10