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Use VLC Media Player or MPC-HC. They support almost all codecs.
The cast of the film Phone Bhoot (Katrina Kaif, Ishaan Khatter, and Siddhant Chaturvedi). Resolution: 720p (High Definition) File Format: MKV (Matroska Video) 🛡️ Important Safety Warnings
If you already have a legitimate .mkv file and need to play it: