This indicates that the file includes Dutch (Nederlands) subtitles hardcoded or muxed into the video stream, catering specifically to the Benelux market.
: This is likely the title of the movie or TV show. In this context, it refers to the 2012 science fiction film "Prometheus," directed by Ridley Scott. PROMETHEUS.-2012-.1080P.X264.NL.SUBBED.BRADJE.mkv
So, in summary, this filename describes a 2012 movie titled "Prometheus," available in Full HD (1080p), encoded with x264, possibly with Dutch subtitles, released or uploaded by someone or a group named BRADJE, in the .mkv format. This indicates that the file includes Dutch (Nederlands)