The file might be corrupted or missing a "header." This often happens with interrupted recordings or recovered files. You can try repairing it using tools like Fix.Video or Untrunc . 3. Safety Precautions

Before opening, run the file through an antivirus or upload it to VirusTotal to ensure it isn't malware disguised as a video.

Right-click the file, select Properties , and click the Details tab. You may find the "Date Created," which can help you remember when it was recorded. On Mac: Right-click and select Get Info .

Since the name is non-descriptive, you can check the file's metadata to learn about its origin: