Theperipherals01e01pilot480phindienglishmsubsvegamoviestomkv -

: The file extension (Matroska Video), a container format that supports multiple audio and subtitle tracks.

The string is a typical filename used by file-sharing and torrent sites to describe a specific media file. ThePeripheralS01E01Pilot480pHindiEnglishMsubsVegamoviestomkv

: The name of the website or "release group" that uploaded or encoded the file. : The file extension (Matroska Video), a container