The format teof_notno-mang-mists-gozs looks similar to the naming conventions used by: (often uses 3-4-3 character strings).
If you have the file and want to know what it is or how to use it, you can try these steps: 🛠️ Check File Metadata
Right-click > Get Info . Check the "More Info" section. 🎞️ Use a Universal Media Player
If you can provide more context, I can give you a much better guide. For example: Where did you or find this file? What is the approximate size of the video?