01. — Mom And Daughter.mkv.mp4

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

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.

If you have OBS installed, you can use the Remux Recordings tool to quickly change the container format from MKV to MP4 without losing quality. Summary Table Recommended Tool/Action Play immediately VLC Media Player or MPV Fix name Rename file (ensure "File name extensions" is on) Change format Use HandBrake or CloudConvert 01. Mom And Daughter.mkv.mp4

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

If you want to clean up the name and ensure your system recognizes it properly, follow these steps: Open File Explorer and go to the View tab. Check the box for to see the full name

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

Because of the potential format confusion, it is best to use a "universal" media player that can handle almost any codec. It is free, open-source, and can play both

If renaming the file doesn't work and it still won't play, the "wrapper" might be broken. You can "remux" or convert it to a standard format: