Right-click the file (on Windows) or select 'Get Info' (on macOS) to see if the "Created" or "Modified" date helps identify when it was made [Source].
If this is from a specific software (e.g., security cameras, OBS, screen recording software), searching for that software's file naming patterns might explain the "049g" designation [Source]. If you can share: Where you found the file (on a camera, downloaded, etc.) The file extension (is it definitely .mp4?) When it was created I can help narrow down what it might be. 049g.mp4
Look at the folder where the file is stored. The surrounding files or folder name often provide context about its purpose [Source]. Right-click the file (on Windows) or select 'Get
Use a tool like MediaInfo to check the metadata, codec, resolution, and creation date of the file. This can tell you if it's a security recording, a fragment of a larger video, or a screen capture. Look at the folder where the file is stored