Since the extension is , the file likely uses the following standards: Container: MPEG-4 Part 14, the most universal video format.
If the file was downloaded from an unknown source, run it through a service like VirusTotal before opening it to ensure it isn't a malicious script disguised as a video. 10500503.mp4
Playable on virtually all modern devices, including smartphones, web browsers, and media players like VLC. How to Safely Check the Content Since the extension is , the file likely