You can find the actual Blu-ray (which that file was ripped from) at most major retailers or local libraries.
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 patriots-day-1080p-br-org-desiremovies-mom-mkv
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. You can find the actual Blu-ray (which that