If you have obtained this episode in M4B format, you are likely looking at an audio-only extraction of the television episode (often created for listening as a radio play or commentary).
The extension stands for MPEG-4 Audiobook . It is a container file format very similar to .m4a , but with specific features optimized for long-form audio playback, such as audiobooks and podcast archives. ghosts s03e01 m4b
An Exploration of Identity and Community in the Afterlife: A Critical Analysis of "Ghosts" S03E01 "M4B" If you have obtained this episode in M4B