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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .GFI | Intuit, Inc. | Data Files | GIFI File | Intuit TurboTax | Intuit, Inc. |
| .GFL | GiliSoft | Data Files | File Lock Pro Encrypted Archive | File Lock Pro | GiliSoft |
| .GFS | Glarysoft Ltd. | Data Files | Glarysoft Split File | Glary Utilities 5 | Glarysoft Ltd. |
| .GGB | Markus Hohenwarter | Data Files | GeoGebra Document | GeoGebra | Markus Hohenwarter |
| .GGI | The GGI Project | Data Files | General Graphics Interface File | General Graphics Interface | The GGI Project |
| .GGM | Sharon Dugdale and David Kibbey | Data Files | Green Globs & Graphing Equations Saved State File | Green Globs & Graphing Equations | Sharon Dugdale and David Kibbey |
| .GHT | Symantec Corporation | Data Files | Norton Ghost Project | Norton Ghost | Symantec Corporation |
| .GIB | New England Software | Data Files | Graph-in-the-Box Chart File | Graph in the Box | New England Software |
| .GIL | Unknown Developer | Data Files | GILS Document | Python | Python Software Foundation |
| .GIM | Sony | Data Files | PlayStation Portable Image File | RCO Editor | Open Source |
| .GIS | Zaplots Games, Inc. | Data Files | CFS Console Game Installer Settings File | CFS Console | Zaplots Games, Inc. |
| .GITMODULES | Open Source | Data Files | Git Module | Git | Open Source |
| .GIW | New England Software | Data Files | Graph-in-the-Box For Windows Presentation | Graph-in-the-Box | New England Software |
| .GIX | Microsoft Corporation | Data Files | Genigraphics Graphics Link Presentation File | Microsoft PowerPoint | Microsoft Corporation |
| .GJF | Gaussian, Inc. | Data Files | Gaussian Input Data File | Gaussian | Gaussian, Inc. |
| .GL3 | Unknown Developer | Data Files | Green Line File | Unknown Software | Unknown Developer |
| .GLF | Vladimir Romanyuk | Data Files | Space Engine Shader File | Space Engine | Vladimir Romanyuk |
| .GLG | Cadence Design Systems | Data Files | MicroSim PCBoard Photoplot Job | OrCAD PCB Designer | Cadence Design Systems |
| .GLK | Microsoft Corporation | Data Files | Microsoft Groove Shortcut | Microsoft Office | Microsoft Corporation |
| .GLO | Adobe Systems Incorporated | Data Files | RoboHelp Glossary File | Adobe RoboHelp | Adobe Systems Incorporated |
| .GLP | EIVA a/s | Data Files | NaviEdit Geoconsult Long Profile | NaviEdit | EIVA a/s |
| .GLS | Babylon Software Ltd. | Data Files | Babylon Glossary File | Babylon | Babylon Software Ltd. |
| .GLT | Sothink | Data Files | Sothink Glanda Data File | Glanda | Sothink |
| .GLY | Microsoft Corporation | Data Files | Word Glossary File | Microsoft Word | Microsoft Corporation |
| .GLZ | CPT | Data Files | Crossword Power Tools Crossword Library File | Crossword Power Tools | CPT |
| .GM81 | YoYo Games | Data Files | GameMaker Data | GameMaker Studio | YoYo Games |
| .GMA | Garry Newman | Data Files | Garry's Mod Addon File | Facepunch Studios Garry's Mod | Garry Newman |
| .GMAP | Garmin | Data Files | Garmin Map File | Garmin BaseCamp | Garmin |
| .GMD | YoYo Games | Data Files | Game Maker Program Code | GameMaker Studio | YoYo Games |
| .GML | Galdos Systems, Inc. | Data Files | Geography Markup Language File | Canvas X | ACD Systems |
| .GMP | Blue Marble Geographics | Data Files | Global Mapper Package File | Global Mapper | Blue Marble Geographics |
| .GMS | Open Source | Data Files | Gesture And Motion Signal File | libGMS | Open Source |
| .GMT | Image Space Incorporated | Data Files | rFactor Model File | Zanoza ZModeler | Zanoza Software |
| .GMV | GenSoft | Data Files | Gens Game Recording | Gens | Open Source |
| .GMX | YoYo Games | Data Files | GameMaker File | GameMaker Studio | YoYo Games |
| .GNA | Microsoft Corporation | Data Files | Genigraphics Graphics Link Presentation File | Microsoft PowerPoint | Microsoft Corporation |
| .GNF | Tom Pycke | Data Files | GluonPilot Navigation File | Gluonpilot navigation file | Tom Pycke |
| .GNH | GravoGraph | Data Files | GravoStyle Data | GravoStyle | GravoGraph |
| .GNL | Micro Focus International plc | Data Files | GNT Analyzer Result Data | GNT Analyzer | Micro Focus International plc |
| .GNO | GenoPro, Inc. | Data Files | GenoPro Genealogy Tree File | GenoPro | GenoPro, Inc. |
| .GNU | Sublime HQ Pty Ltd | Data Files | GNU Licence Information | Sublime Text | Sublime HQ Pty Ltd |
| .GNX | Microsoft Corporation | Data Files | Microsoft PowerPoint Data | Microsoft PowerPoint | Microsoft Corporation |
| .GOH | Geoworks Ensemble | Data Files | Geoworks GOC Header File | Unknown Software | Unknown Developer |
| .GOLD | Interscape | Data Files | Gnome Desktop Data | GNOME Desktop | Interscape |
| .GOP | Fine Software | Data Files | Geo5 File | Geo5 | Fine Software |
| .GP3 | Arobas Music | Data Files | Guitar Pro 3 File | Music Guitar Pro | Arobas Music |
| .GPC | CÍGLER SOFTWARE, a.s. | Data Files | ABO Financial Exchange Message | Money S3 | CÍGLER SOFTWARE, a.s. |
| .GPH | StataCorp | Data Files | Stata Graph Data | Stata | StataCorp |
| .GPI | Garmin | Data Files | Garmin Point Of Interest File | Garmin POI loader | Garmin |
| .GPJ | Green Hills Software | Data Files | MULTI IDE Project File | Green Hills MULTI IDE | Green Hills Software |
| .GPL | Open Source | Data Files | GNU Public License Text File | Microsoft Notepad | Microsoft Corporation |
| .GPP | Open Source | Data Files | Guitar Practiced Perfectly 2 Data File | Guitar Practiced Perfectly version 2 | Open Source |
| .GPR | Molecular Devices | Data Files | GenePix Results File | Microsoft Excel | Microsoft Corporation |
| .GPT | Gerber Technology | Data Files | Gerber Top Pad Master Data | Altium Designer | Altium |
| .GPZ | IBM | Data Files | IBM DB2 Document Manager Document History Data | IBM DB2 | IBM |
| .GQ | Unknown Developer | Data Files | QLFC Archive Or Epson Printer Page Description Language | Unknown Software | Unknown Developer |
| .GQA | Hummingbird Ltd. | Data Files | BI/Query Data Model Admin Layer | Unknown Software | Unknown Developer |
| .GR4 | Contract Telecommunication Engineering Ltd. | Data Files | Pathloss Sharing Data | Pathloss | Contract Telecommunication Engineering Ltd. |
| .GRA | Microsoft Corporation | Data Files | Microsoft Graph File | Microsoft Excel | Microsoft Corporation |
| .GRADS | Jörg Wegner (Joerg Wegner) | Data Files | PINGO GrADS Data File | PINGO | Jörg Wegner (Joerg Wegner) |
| .GRAMPS | Open Source | Data Files | Gramps XML Data | Gramps | Open Source |
| .GRAPHICS | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .GRAPHML | The GraphML Team | Data Files | GraphML File | yWorks yEd Graph Editor | yWorks |
| .GRC | Affymetrix | Data Files | Affymetrix Grid Control Data | GeneChip Instrument System | Affymetrix |
| .GRD | Adobe Systems Incorporated | Data Files | Photoshop Gradient File | Adobe Photoshop | Adobe Systems Incorporated |
| .GRE | Open Source | Data Files | GRETEP Data | GRETEP | Open Source |
| .GRF | GRAVITY | Data Files | Ragnarok Client Archive | Ragnarok Online | GRAVITY |
| .GRIP | World Meteorological Organization | Data Files | Gridded Binary File | Unknown Software | Unknown Developer |
| .GRK | Daniel Ethier | Data Files | Gradekeeper Class Gradebook File | Gradekeeper | Daniel Ethier |
| .GRM | Bruce Murtagh and Michael Saunders | Data Files | MINOS Data | MINOS | Bruce Murtagh and Michael Saunders |
| .GRP | Blizzard Entertainment Inc. | Data Files | StarCraft Graphics Group File | StarCraft | Blizzard Entertainment Inc. |
| .GRR | Daniel Ethier | Data Files | Gradekeeper Class Roster Data | Gradekeeper | Daniel Ethier |
| .GRS | Headlight Software | Data Files | GetRight Skin | GetRight | Headlight Software |
| .GRT | Golden Software LLC | Data Files | Grapher Template | Golden Software Grapher | Golden Software LLC |
| .GRV | Microsoft Corporation | Data Files | Office Groove File | Microsoft Office Groove | Microsoft Corporation |
| .GRW | Naviter | Data Files | SeeYou Waypoint File | SeeYou | Naviter |
| .GS | Data Files | Google Apps Script | Google Apps Script | ||
| .GS4 | Bloodlust Software | Data Files | Genecyst Saved State Slot 4 | Genecyst | Bloodlust Software |
| .GS6 | Bloodlust Software | Data Files | Genecyst Saved State Slot 6 | Genecyst | Bloodlust Software |
| .GS9 | Bloodlust Software | Data Files | Genecyst Emulator Saved State 9 | Genecyst | Bloodlust Software |
| .GSA | Microsoft Corporation | Data Files | Microsoft Office Groove 2007 Archived Workspace | Microsoft Office | Microsoft Corporation |
| .GSC | Activision | Data Files | Call Of Duty Game Script | Notepad++ | Don Ho |
| .GSD | PROFIBUS & PROFINET International | Data Files | General Station Description File | Microsoft Notepad | Microsoft Corporation |
| .GSE | Psytech International | Data Files | GeneSys Export Data | GeneSys | Psytech International |
| .GSH | Microsoft Corporation | Data Files | Microsoft Visual Studio Data File | Microsoft Visual Studio | Microsoft Corporation |
| .GSHADER | Microsoft Corporation | Data Files | Microsoft Visual Studio Data File | Microsoft Visual Studio | Microsoft Corporation |
| .GSO | The Golden Section Labs | Data Files | GoldenSection Notes File | GoldenSection Notes | The Golden Section Labs |
| .GSPLUS | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .GST | MapInfo Corporation | Data Files | MapInfo Geoset File | MapInfo Professional | Pitney Bowes |
| .GT2 | SourceForge | Data Files | Graoumf Tracker Music Module (MOD) | Graoumf Tracker | SourceForge |
| .GTAR | Free Software Foundation | Data Files | GNU Tar Archive | Apple Archive Utility | Apple |
| .GTD | Mitsubishi Electric Corporation | Data Files | GT Designer 2 Project | GT Designer | Mitsubishi Electric Corporation |
| .GTF | Open Source | Data Files | Gene Transfer Format File | Integrated Genome Browser | Open Source |
| .GTM | Open Source | Data Files | GreekToMe Translation File | GreekToMe | Open Source |
| .GTO | Quicken | Data Files | Quicken Online Data File | Intuit Quicken | Quicken |
| .GTP | Ucamco | Data Files | Gerber Top Solder Paste Data File | CadSoft EAGLE | Autodesk, Inc. |
| .GTR | Stanford Center for Biomedical Informatics Research | Data Files | Stanford Microarray Database Gene Tree Data | Standford Microarray | Open Source |
| .GTS | Ucamco | Data Files | Gerber Top Solder Mask Data File | Altium Designer | Altium |
| .GTT | Eckhard Gartz | Data Files | Guntram's Tabletweaving Thingy Data | Guntram's Tabletweaving Thingy | Eckhard Gartz |
| .GTY | Open Source | Data Files | G-clamp Template File | G-clamp | Open Source |
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