You can typically open this file using VLC Media Player or standard OS video apps.
The "9640" part is typically a sequential ID assigned by the camera or the system during recording or export. Technical Properties of MP4 g9640.mp4
These systems typically record in proprietary formats like .g64 or .g64x to preserve metadata such as timestamps, motion indicators, and bookmarks. You can typically open this file using VLC
A file named "g9640.mp4" is likely a proprietary surveillance clip that has been converted or exported to a standard format for viewing on standard Windows or mobile media players. g9640.mp4
