If it is a G4 security file, you may need the G4 Viewer Plus to view synchronized metadata like GPS and vehicle sensor data.

The G4 prefix is commonly used for files exported from the G4 Viewer Plus , a video management software for fleet and asset management. These files are typically exported in .mp4 format for sharing incident reports.

If the file does not open, using a versatile player like VLC Media Player often resolves codec issues.

It could also be a system-generated file name from specialized hardware such as a Panasonic GH4 Go to product viewer dialog for this item.