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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. patriots-day-1080p-br-org-desiremovies-mom-mkv
These are tags for the specific group or website that uploaded or encoded the file. MKV: The file container format (Matroska Video). How to Watch "Patriots Day" Safely If you're trying to play an MKV file