In the first place, we should clarify exactly 'What an MKV codec is', to avoid any misunderstandings: Can't Play MKV File with Windows Media Player Therefore, we rounded up the best free MKV codecs to help you play MKV files in Windows 7/10/11 without error.
Even though MKV has been natively supported since Windows 10, many people still can't play MKV files with Windows Media Player, because the media player is unable to decode all types of codecs used in MKV files.
