However, if you are looking for a guide on how to this specific file type, here is what you need to know: 1. Why does it have two extensions (.mp4 and .mkv)?
: A free tool where you can drop the file and select the "MP4" preset to convert it. VID_20221216_110750_187.mp4.mkv
If your standard video player (like Windows Media Player or QuickTime) won't open it, use a universal player that supports MKV: However, if you are looking for a guide
If you need the file to be a standard MP4 to use on a phone or TV, you can "remux" it (change the container without losing quality): If your standard video player (like Windows Media
: The most reliable free tool for opening almost any video format.
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If you this file from a suspicious website (like a torrent or "free movie" site) and it is asking you to "download a codec" or "run a guide.exe" to view it, do not do so. This is a common way to spread malware.