List of All the File Extensions Formats and Types Starting With the Letter G
| File Extension | Description |
| .GADGET | Windows sidebar gadget |
| .GAF | Total Annihilation image format |
| .GAL | GenePix Array List |
| .GALAXY | Blizzard Starcraft 2 Galaxy script |
| .GALLERY | SMART Notebook gallery |
| .GAMOUT | GAMESS Output chemical modeller input |
| .GAN | GanttProject project pla |
| .GARMIN | Garmin Hacking Project |
| .GAMOUT | GAMESS Output chemical modeller input |
| .GAT | Genetic Algorithm Timetabler (GATTer) Configuration and Information |
| .GAX | Age of Empires II save game |
| .GE2 | Maya 4 GE2 exporter |
| .GE6 | WinFamily 6 genealogy |
| .GEA | Fifa World Cup game data |
| .GET | Geotechnical Exchange Format |
| .GZ | GZIP compressed archive GIMP graphics and images |
| .GEL | Molecular Dynamics image |