Use VLC Media Player . It is free, open-source, and can play both MKV and MP4 files regardless of whether the extension is named correctly.

The is always the one at the very end. In this case, your computer sees it as an MP4 file . However, if it was originally an MKV and someone just typed ".mp4" at the end, it might not play correctly in standard players. 2. How to Play the File

Remove the extra .mkv or .mp4 so only one remains (e.g., 01. Mom And Daughter.mp4 ). Select the file and press Command + I to "Get Info." Under Name & Extension , delete the unnecessary extension. 4. Convert if Unplayable

Check the box for to see the full name. Right-click the file and select Rename .

Because of the potential format confusion, it is best to use a "universal" media player that can handle almost any codec.

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