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.
Since the extension is , the file likely uses the following standards: Container: MPEG-4 Part 14, the most universal video format.
Older or specific brands of digital cameras (like older Sony or Nikon models) often use sequential 8-digit numbering schemas for saved media.
Right-click the file and select Properties (Windows) or Get Info (Mac) to see the "Media Created" date, which often reveals the true origin.
If you have encountered this file and are unsure of its origin, follow these steps:
Playable on virtually all modern devices, including smartphones, web browsers, and media players like VLC. How to Safely Check the Content