If you found this file in a suspicious context (e.g., an unsolicited message or a random system folder), keep the following in mind:
Malicious actors often rename harmful scripts or executables with double extensions (e.g., AgADpgkAApRVQFY.mkv.exe ) to trick users into opening them. AgADpgkAApRVQFY.mkv
Ensure "Hide extensions for known file types" is disabled in your OS settings to confirm it is truly an .mkv and not an executable. If you found this file in a suspicious context (e