Vid_qy-r.mp4

: Run the file through an antivirus program or an online scanner like VirusTotal before playing it.

: Likely a unique, randomly generated alphanumeric string or a timestamp-encoded ID used by the device's operating system to prevent file overwriting. VID_QY-r.mp4

: A file fragment found in a browser cache or an application's data folder. : Run the file through an antivirus program