"Phredr E04mp4" does not appear to be a standard reference to a widely known game, movie, or software tool in general public databases.
Based on the structure of the string, it is likely a specific for a video (Episode 4) from a niche series or a recorded gameplay session. While a direct "guide" doesn't exist for this specific file string, here is how you can find the content or context it refers to: Potential Contexts
The "E04" and "mp4" suggest it is the fourth episode of a series. There is a series called Pehredaar that has an Episode 4 (E04), though the spelling differs slightly from "Phredr".