What Is an MKV File? - Lifewire
https://www.lifewire.com/mkv-file-4135396
WEBMay 16, 2023 · MKV files are videos saved in the Matroska container format. Open one with VLC. You can convert MKV to MP4, MOV, MP3, etc., at Zamzar, or with another free video file converter. …
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