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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .G3X | Knife Edge Software | Game Files | RealFlight Content File | RealFlight | Knife Edge Software |
| .G4B | Open Source | Game Files | Sokoban++ Level File | Sokoban | Open Source |
| .GAM | Nintendo | Game Files | Saved Game File | No Cash GBA (No$GBA) | Martin Korth |
| .GAME | Apple | Game Files | Apple Chess Saved Game | Apple Chess | Apple |
| .GAR | GIANTS Software | Game Files | Farming Simulator Game Archive File | Farming Simulator | GIANTS Software |
| .GAX | Microsoft Corporation | Game Files | Age Of Empires II Saved Game | Microsoft Age of Empires | Ensemble Studios |
| .GBA | Unknown Developer | Game Files | Game Boy Advance ROM | No Cash GBA (No$GBA) | Martin Korth |
| .GBC | VBA Team | Game Files | Game Boy Color ROM | VisualBoyAdvance | VBA Team |
| .GBX | Nadeo | Game Files | Nadeo Game File | TrackMania | Nadeo |
| .GC | Arizona | Game Files | GraphClick File | GraphClick | Arizona |
| .GCD | General CADD Products | Game Files | Generic CADD Drawing File | General CADD Pro | General CADD Products |
| .GCF | Valve | Game Files | Game Cache File | Steam | Valve |
| .GCI | Nintendo | Game Files | GameCube Save File | Dolphin (emulator) | Dolphin Emulator Project |
| .GCM | Nintendo | Game Files | GameCube ROM | Dolphin (emulator) | Dolphin Emulator Project |
| .GCS | Dolphin Emulator Project | Game Files | GameCube SharkSave File | Dolphin (emulator) | Dolphin Emulator Project |
| .GCT | Interscape | Game Files | Ocarina Cheat Code Manager Exported Cheat | Ocarina Cheat Code Manager | Interscape |
| .GCV | thriXXX | Game Files | SexVilla Game Movie | SexVilla | thriXXX |
| .GDB | Garmin | Game Files | GPS Database File | Garmin BaseCamp | Garmin |
| .GDF | Eytan Adar | Game Files | GUESS Graph Data Format File | GUESS | Eytan Adar |
| .GDG | Interscape | Game Files | GDevelop Project File | GDevelop | Interscape |
| .GDI | Open Source | Game Files | Dreamcast Gigabyte Disc Image | nullDC | Open Source |
| .GDW | Appaloosa Interactive | Game Files | Jaws Unleashed Data File | Jaws Unleashed | Appaloosa Interactive |
| .GEN | Sega | Game Files | Sega Genesis ROM | Kega Fusion | Steve Snake |
| .GFX | Autodesk, Inc. | Game Files | GFx Scaleform File | Scaleform GFx | Autodesk, Inc. |
| .GG | Game Files | Google Desktop Gadget File | Google Desktop | ||
| .GGS | Nintendo | Game Files | Gameboy Emulator File | No Cash GBA (No$GBA) | Martin Korth |
| .GHB | High Voltage Software | Game Files | Lego Ghost Path File | High Voltage Software LEGO Racers | High Voltage Software |
| .GHS | Symantec Corporation | Game Files | Norton Ghost Image Segment Backup File | Symantec Ghost Solution Suite | Symantec Corporation |
| .GIC | BioWare | Game Files | BioWare Aurora Engine Area Data | BioWare Neverwinter Nights | BioWare |
| .GJD | Trilobyte | Game Files | The 7th Guest Media File | The 7th Guest | Trilobyte |
| .GL | John Bridges | Game Files | GRASP Animation | Dassault Systemes CATIA | Dassault Systèmes |
| .GLB | Analytical Graphics | Game Files | STK Globe File | Systems Tool Kit (STK) | Analytical Graphics |
| .GM1 | New World Computing | Game Files | Heroes Of Might & Magic III Saved Game | Heroes of Might & Magic III | Ubisoft |
| .GM2 | New World Computing | Game Files | Heroes Of Might & Magic III Saved Game | Heroes of Might & Magic III | Ubisoft |
| .GM3 | New World Computing | Game Files | Heroes Of Might & Magic III Saved Game | Heroes of Might & Magic III | Ubisoft |
| .GM4 | New World Computing | Game Files | Heroes Of Might & Magic III Saved Game | Heroes of Might & Magic III | Ubisoft |
| .GM7 | New World Computing | Game Files | Heroes Of Might & Magic III Saved Game | Heroes of Might & Magic III | Ubisoft |
| .GM8 | New World Computing | Game Files | Heroes Of Might & Magic III Saved Game | Heroes of Might & Magic III | Ubisoft |
| .GMA | Garry Newman | Game Files | Garry's Mod Addon File | Facepunch Studios Garry's Mod | Garry Newman |
| .GME | InterAct | Game Files | DexDrive Game Card File | InterAct DexDrive | InterAct |
| .GMP | Blue Marble Geographics | Game Files | Global Mapper Package File | Global Mapper | Blue Marble Geographics |
| .GMV | GenSoft | Game Files | Gens Game Recording | Gens | Open Source |
| .GOD | 4D, Inc | Game Files | Gore Game Data File | Gore: Ultimate Soldier | 4D, Inc |
| .GODD | Games On Demand Pty. Ltd. | Game Files | Partial Downloaded Game File | G.O.D Arena | Games On Demand Pty. Ltd. |
| .GOO | LucasArts Entertainment Company, LLC | Game Files | Jedi Knight: Mysteries Of The Sith Game Data | Jedi Knight: Mysteries of The Sith | Valve |
| .GPD | Microsoft Corporation | Game Files | Generic Printer Description File | Microsoft Windows | Microsoft Corporation |
| .GPF | Open Source | Game Files | Gecko Patch File | Nintendulator | Open Source |
| .GPM | GRAVITY | Game Files | Ragnarok Online Update File | Ragnarok Online | GRAVITY |
| .GR2 | Larian Studios | Game Files | Divinity: Original Sin Game Data | Divinity: Original Sin | Larian Studios |
| .GRA | Microsoft Corporation | Game Files | Microsoft Graph File | Microsoft Excel | Microsoft Corporation |
| .GRF | GRAVITY | Game Files | Ragnarok Client Archive | Ragnarok Online | GRAVITY |
| .GRN | RAD Game Tools | Game Files | Granny 3D File | Granny 3D | RAD Game Tools |
| .GRO | Open Source | Game Files | Allegro MIDI File | Audacity | Open Source |
| .GRP | Blizzard Entertainment Inc. | Game Files | StarCraft Graphics Group File | StarCraft | Blizzard Entertainment Inc. |
| .GRS | Headlight Software | Game Files | GetRight Skin | GetRight | Headlight Software |
| .GRV | Microsoft Corporation | Game Files | Office Groove File | Microsoft Office Groove | Microsoft Corporation |
| .GS0 | Sega | Game Files | Sega Genesis Emulator Quick Slot 0 Save File | Kega Fusion | Steve Snake |
| .GSC | Activision | Game Files | Call Of Duty Game Script | Notepad++ | Don Ho |
| .GST | MapInfo Corporation | Game Files | MapInfo Geoset File | MapInfo Professional | Pitney Bowes |
| .GSV | Mad Catz | Game Files | GameShark Saved Game | Unknown Software | Unknown Developer |
| .GSX | Sega | Game Files | Sega Genesis Emulator Saved State File | Kega Fusion | Steve Snake |
| .GUT | GUT GmbH | Game Files | ASSISTANT Data File | ASSISTANT | GUT GmbH |
| .GVR | GeoVisu Development Team | Game Files | GeoVisu Routes File | GeoVisu | GeoVisu Development Team |
| .GZP | Interplay Entertainment | Game Files | Giants Citizen Kabuto Game File | Giants: Citizen Kabuto | Interplay Entertainment |
| .GZR | MAIET Entertainment | Game Files | GunZ File | MAIET Entertainment GunZ | MAIET Entertainment |
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