Indicates the video quality is High Definition (1080p) sourced from a Blu-ray disc.

If you're trying to play an MKV file you already have and it won’t open, I recommend using VLC Media Player . It’s free, safe, and plays almost any file format without needing extra codecs.

The 2016 film starring Mark Wahlberg about the Boston Marathon bombing.

You can find the actual Blu-ray (which that file was ripped from) at most major retailers or local libraries.