M4B files are a type of audio book file – specifically, MPEG-4 encoded ones. They are the most common format used by iTunes to store audio books. The format can store sound the same way an MP3 can, but it has a distinct advantage – it allows for ‘bookmarking’ so to speak. In other words, it lets you keep your place in the file, so that you can resume listening in the same place later. MP3 files can’t do that.
For this reason, they are often also used by media players for their bookmark support. Other MPEG-4 extensions include M4A, which is used for music, and M4R, which is used for iPhone ringtones.
How can you open M4B files?
Most media players can open these files, but the primary program to do so is iTunes. M4A files are compatible with iOS devices and can be transferred, opened and played without the need for additional software or apps.
Double-click on the file and select the program you want to open it with. If a media player doesn’t recognise the file extension, open a new window of the player, and then use the ‘Open’ function from the menu to open it – that way, it should work.
What programs work with M4B files?
iTunes is the first choice for this type, but Windows Media Player works as well. Most major media players work, such as VLC, MPC-HC and PotPlayer.