The string is a file name for a digital video file, likely a television show episode. Based on standard file naming conventions for media: mmmtr : Likely an abbreviation for the show title.
: Short for "Screener," indicating a pre-release version of the content often sent to critics or awards voters. 3x04 : Denotes Season 3, Episode 4 . m1080p : Indicates a high-definition resolution (1920x1080). mmmtr.scr.3x04.m1080p.es.mkv.mp4
: These are file extensions; having both typically suggests a conversion or a container-related naming error. The string is a file name for a