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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .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 |
| .H2O | Liquid Entertainment | Game Files | Battle Realms Game Data File | Total Commander | Ghisler Software GmbH |
| .H3M | New World Computing | Game Files | Heroes 3 Map File | Heroes of Might & Magic III | Ubisoft |
| .H4C | New World Computing | Game Files | Heroes Of Might And Magic II Map File | Heroes of Might & Magic III | Ubisoft |
| .H4R | New World Computing | Game Files | Heroes Of Might And Magic IV Data File | Heroes of Might and Magic IV | New World Computing |
| .HAK | BioWare | Game Files | BioWare Aurora Engine Data File | BioWare Neverwinter Nights | BioWare |
| .HAM | Interplay Entertainment | Game Files | Descent 2 Resource File | Interplay Descent 2 | Interplay Entertainment |
| .HAT | Landon Podbielski | Game Files | Duck Game Hat File | Duck Game | Landon Podbielski |
| .HCA | Empirix Inc | Game Files | Hammer Call Analyzer Network Traffic Data | Hammer Call Analyzer | Empirix Inc |
| .HE | Humongous Entertainment | Game Files | Humongous Entertainment Game Resource Archive | 7-Zip | Igor Pavlov |
| .HE0 | Humongous Entertainment | Game Files | Humongous Entertainment Game Archive | ScummVM | Interscape |
| .HEA | EA Sports | Game Files | FIFA 2001 Data File | FIFA 2001 | EA Sports |
| .HES | Hudson Soft | Game Files | Hudson Entertainment Sound | Audio Overload | Richard Bannister |
| .HFB | Open Source | Game Files | Hell Fighter Battle File | Hell Fighter | Open Source |
| .HGH | LucasArts Entertainment Company, LLC | Game Files | Star Wars: Tie Fighter High Score Data | Star Wars: TIE Fighter | LucasArts Entertainment Company, LLC |
| .HI | Interscape | Game Files | MacMAME High Scores File | MAME | Open Source |
| .HKX | Bethesda Softworks | Game Files | The Elder Scrolls V: Skyrim Animation | The Elder Scrolls V: Skyrim | Bethesda Softworks |
| .HLK | Relic Entertainment | Game Files | Warhammer 40.000: Dawn Of War 2 Animation File | Warhammer 40K Dawn of War | Relic Entertainment |
| .HLS | EA Maxis | Game Files | SimCity 4 Hitlist | Electronic Arts SimCity 4 | Electronic Arts |
| .HMP | Team17 | Game Files | Worms Height Map File | Team17 Worms Mayhem | Team17 |
| .HOD | Sierra Entertainment | Game Files | Homeworld Object Data | Homeworld 2 | Sierra Entertainment |
| .HOF | Unknown Developer | Game Files | Hall Of Fame Data | Unknown Software | Unknown Developer |
| .HOG | LucasArts Entertainment Company, LLC | Game Files | Lucas Arts Dark Forces Data File | Star Wars: Dark Forces | LucasArts Entertainment Company, LLC |
| .HOGG | Cryptic Studios | Game Files | Cryptic Studios Data | Star Trek Online | Cryptic Studios |
| .HOI4 | Paradox | Game Files | Hearts Of Iron IV Saved Game | Hearts of Iron IV | Paradox Development Studio |
| .HONMOD | S2 Games | Game Files | Heroes Of Newerth (HON) Modification Manager File | HON Modification Manager | Unknown Developer |
| .HOP | Heavy Iron Studio | Game Files | The SpongeBob SquarePants Movie Game File | The SpongeBob SquarePants Movie | Heavy Iron Studio |
| .HOTSPOT | Relic Entertainment | Game Files | Homeworld Cursor Information File | Homeworld | Relic Entertainment |
| .HOUSEHOLDBINARY | Electronic Arts | Game Files | The Sims 4 Game Data | The Sims 4 | Electronic Arts |
| .HPK | Interscape | Game Files | HPack Compressed Archive | HPack | Interscape |
| .HPS | Frictional Games | Game Files | HPL Script | Microsoft Notepad | Microsoft Corporation |
| .HQM | Unknown Developer | Game Files | Hardcore Questing Mode Data File | Hardcore Questing Mode | Unknown Developer |
| .HS | Open Source | Game Files | Haskell Script | MacroMates TextMate | MacroMates |
| .HSD | Microsoft Corporation | Game Files | Hagaki Studio Document File | Microsoft Hagaki Studio | Microsoft Corporation |
| .HUL | Probe Entertainment | Game Files | Re-Volt Collision Data File | Acclaim Entertainment Re-Volt | Probe Entertainment |
| .HUM | MR Software | Game Files | OMSI Human Configuration File | OMSI | MR Software |
| .HVA | Westwood Studios | Game Files | Command & Conquer Voxel Animation Control Data | Command & Conquer: Tiberian Sun | Westwood Studios |
| .HWD | Hedgewars Project | Game Files | Hedgewars Demo File | Hedgewars | Open Source |
| .HWL | Corel | Game Files | Corel Writing Tools File | Corel WordPerfect X8 | Corel |
| .HWMAP | Hedgewars Project | Game Files | Hedgewars Drawn Map File | Hedgewars | Open Source |
| .HWS | Hedgewars Project | Game Files | Hedgewars Saved Game | Hedgewars | Open Source |
| .HXM | Interplay Entertainment | Game Files | Descent 2 Resource Modification | Interplay Descent 2 | Interplay Entertainment |
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