: Ensure it is truly an .mp4 file and not a double extension like Ajb08658.mp4.exe , which is a common trick for malware.
: Always run the file through an antivirus program or upload it to VirusTotal to ensure it isn't a renamed malicious executable.
: Some DVR and CCTV systems use unique alphanumeric codes for saved clips. 2. How to Inspect the File
: If it was downloaded from a website or messaging app, the name might be a random string used for storage on a server.