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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .GDF | Eytan Adar | GIS Files | GUESS Graph Data Format File | GUESS | Eytan Adar |
| .GEOJSON | Open Source | GIS Files | GeoJSON File | Notepad++ | Don Ho |
| .GFW | Open Source | GIS Files | GIF World File | Microsoft Notepad | Microsoft Corporation |
| .GGF | Trimble Inc. | GIS Files | GPS Pathfinder Office Geoid Grid | GPS Pathfinder Office Software | Trimble Inc. |
| .GHD | Adam Schneider | GIS Files | Geonaute Keymaze Tracklog File | GPS Visualizer | Adam Schneider |
| .GLB | Analytical Graphics | GIS Files | STK Globe File | Systems Tool Kit (STK) | Analytical Graphics |
| .GLF | Vladimir Romanyuk | GIS Files | Space Engine Shader File | Space Engine | Vladimir Romanyuk |
| .GMAP | Garmin | GIS Files | Garmin Map File | Garmin BaseCamp | Garmin |
| .GMC | Blue Marble Geographics | GIS Files | Global Mapper Catalog File | Global Mapper | Blue Marble Geographics |
| .GMF | Leadwerks Software | GIS Files | Leadwerks Game Model File | Leadwerks Game Engine | Leadwerks Software |
| .GMI | GPS Tuner | GIS Files | GPS Tuner Map Calibration Data | MAPC2MAPC | The Thorns |
| .GML | Galdos Systems, Inc. | GIS Files | Geography Markup Language File | Canvas X | ACD Systems |
| .GND | ESRI (Environmental Systems Research Institute) | GIS Files | Geography Network Document | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .GPF | Open Source | GIS Files | Gecko Patch File | Nintendulator | Open Source |
| .GPL | Open Source | GIS Files | GNU Public License Text File | Microsoft Notepad | Microsoft Corporation |
| .GPS | Molecular Devices | GIS Files | GenePix Settings File | GenePix Pro Software | Molecular Devices |
| .GPX | Unknown Developer | GIS Files | GPS Exchange File | Gedit | GNOME |
| .GRI | Petrosys Pty Ltd | GIS Files | Petrosys Grid Data | Petrosys | Petrosys Pty Ltd |
| .GSB | Golden Software LLC | GIS Files | Golden Software Boundary File | Golden Software Surfer | Golden Software LLC |
| .GSF | Nintendo | GIS Files | Game Boy Advance Sound File | Nullsoft Winamp | Nullsoft |
| .GSI | Golden Software LLC | GIS Files | Golden Software Interchange File | Golden Software Surfer | Golden Software LLC |
| .GSR | Golden Software LLC | GIS Files | Golden Software Reference File | Golden Software Surfer | Golden Software LLC |
| .GST | MapInfo Corporation | GIS Files | MapInfo Geoset File | MapInfo Professional | Pitney Bowes |
| .GTM | Open Source | GIS Files | GreekToMe Translation File | GreekToMe | Open Source |
| .GTZ | TrackMaker | GIS Files | GPS TrackMaker Data File | GPS TrackMaker | TrackMaker |
| .GVR | GeoVisu Development Team | GIS Files | GeoVisu Routes File | GeoVisu | GeoVisu Development Team |
| .GWC | SISCOSOFT | GIS Files | Golfwits Course Map File | Golfwits | SISCOSOFT |
| .GWS | Intergraph Corporation | GIS Files | GeoMedia GeoWorkspace File | Intergraph GeoMedia | Hexagon Geospatial |
| .GXW | Open Source | GIS Files | GRASS GIS Workspace File | GRASS | Open Source |
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