The file name itself is a common artifact of digital archiving or peer-to-peer sharing:
: This denotes Season 1, Episode 7 of the specific documentary series covering the FTLRRP. T.L.R.R.P.S01E07.mkv.mp4
: This "double extension" suggests the file was originally a High-Definition Matroska Video ( .mkv ) that was later converted to or wrapped in an .mp4 container for better compatibility with standard mobile devices and web players. The file name itself is a common artifact
The Story of Episode 7: The "New Farmers" and Ecological Fallout T.L.R.R.P.S01E07.mkv.mp4