The "g" followed by a string of numbers is a common naming format for files generated by digital cameras, security systems, or automated export tools from video editing software.
Do not open the file unless you know the source. You can check a file's safety without opening it by uploading it to VirusTotal , which scans it against dozens of antivirus engines. g9229.mp4
If you have encountered this file as an attachment in an unexpected email or a suspicious website download, : The "g" followed by a string of numbers