How to Play M4B format files with iTunes?

The first step you need to do is launch this programm and you will see the user interface below:

After the programm been started, the next step is add files to the playlist. "Add File to Library" and "Import" are both the right options.

Now, the file has already been added to iTunes's playlist. What you need to do is to find the file out and double click with the mouse to open it. Then, how to find the file? The answer is click button! Finally, you could enjoy the music!

What is .m4b format?

.m4b is 100 percent identical to .m4a format, but just with different name. So, .m4b is, like .m4a, an audio file wrapped within MPEG-4 container format. The audio encoding can be virtually anything, but most collomly used encoding for both, .m4a and .m4b, files is the AAC.

The only reason for the duplicate naming convention is so that the Apple's iTunes software and iPod players can recognize the file as an audio book rather than a normal audio track and thus allow "bookmarking" the file.