Apps like WhatsApp or Telegram sometimes use hex codes for cached media.
It can open almost any video format, even if the metadata is messy.
Ensure it ends in .mov . If not, rename it to see if it plays.
Use a tool like MediaInfo to see the "real" title or the date it was filmed.
💡 Knowing if it was in a specific app folder , an email attachment , or a web download would help me give you a better guide.