Before opening any file from an unknown source, run it through a security tool like VirusTotal to ensure it isn't a "trojan" disguised as a video.
Could you tell me or if it's related to a specific social media trend ? Knowing the context would help me give you a much more specific answer.
If the video has a unique thumbnail or screenshot, you can use Google Lens to see if it has been posted elsewhere online.
Most modern devices and players, like VLC Media Player or default system apps like Windows Media Player, can open these files automatically. How to Safely Check a Mystery Video
It is designed for high-quality playback while keeping file sizes small, making it the standard for the web and mobile devices.
On a PC, you can right-click the file, select Properties , and go to the Details tab. This can show you the video's resolution, frame rate, and sometimes the date it was created or the software used to make it.
If you’ve come across and aren't sure what it is, follow these steps to identify it without risks:
An is one of the most common digital multimedia container formats.