It is highly likely that "m4p" is a typo for ".mp4" (a standard video file). An .m4p file is a protected AAC audio file format (often used by Apple for iTunes music), which would not contain a video episode.
In the Season 2 finale, Sheldon Cooper is at his most vulnerable. The plot centers on his excitement for the announcement of the . Sheldon stays up until 5:00 a.m. to listen to the results on a shortwave radio. young sheldon s02e22 m4p