| .G1L | Casio Computer Co., Ltd. | Gegevensbestanden | Casio Model 9860 Data | Unknown Software | Unknown Developer |
| .G32 | Microsoft Corporation | Gegevensbestanden | Microsoft FRx General Ledger Index File | Microsoft Dynamics AX | Microsoft Corporation |
| .G9 | Arktec | Gegevensbestanden | Gest Data File | Arktec Gest | Arktec |
| .G94 | Gaussian, Inc. | Gegevensbestanden | Gaussian 94 Output Chemical Modeller Input File | Gaussian | Gaussian, Inc. |
| .GAB | Open Source | Gegevensbestanden | Dencom Global Address Book Export File | Dencom Global Address Book | Open Source |
| .GAI | Adobe Systems Incorporated | Gegevensbestanden | Adobe SING Glyphlet Manager File | Adobe Creative Suite | Adobe Systems Incorporated |
| .GAL | Molecular Devices | Gegevensbestanden | GenePix Array List | Microsoft Excel | Microsoft Corporation |
| .GAT | Microsoft Corporation | Gegevensbestanden | Genetic Algorithm Timetabler | Windows sidebar gadget | Microsoft Corporation |
| .GBD | Great Budget Software | Gegevensbestanden | Great Budget Budget Definition Data | Microsoft Project 2016 | Microsoft Corporation |
| .GBF | Yuku | Gegevensbestanden | General Bible Format | Quick Bible | Yuku |
| .GBK | National Center for Biotechnology Information | Gegevensbestanden | GenBank Data | Genome Compiler | Genome Compiler Corporation |
| .GBL | Ucamco | Gegevensbestanden | Gerber Bottom Layer Data File | CadSoft EAGLE | Autodesk, Inc. |
| .GBR | Gerber Technology | Gegevensbestanden | Gerber Format File | Altium Designer | Altium |
| .GBX | Nadeo | Gegevensbestanden | Nadeo Game File | TrackMania | Nadeo |
| .GC | Arizona | Gegevensbestanden | GraphClick File | GraphClick | Arizona |
| .GCC | GNU Operating System | Gegevensbestanden | GNU C++ File | GNU Bash | GNU Operating System |
| .GCF | Valve | Gegevensbestanden | Game Cache File | Steam | Valve |
| .GCT | Interscape | Gegevensbestanden | Ocarina Cheat Code Manager Exported Cheat | Ocarina Cheat Code Manager | Interscape |
| .GCX | Golden Software LLC | Gegevensbestanden | Grapher Graph File | Golden Software Grapher | Golden Software LLC |
| .GD3 | GreatProgs | Gegevensbestanden | GreatFamily Tree File | GreatFamily | GreatProgs |
| .GDA | The Open Group | Gegevensbestanden | Unix Manual Page Guide | Unix | AT&T Labs |
| .GDB | Garmin | Gegevensbestanden | GPS Database File | Garmin BaseCamp | Garmin |
| .GDBTABLE | Open Source | Gegevensbestanden | Geodatabase Table File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .GDC | Iconics, Inc. | Gegevensbestanden | Iconics GraphWorx32 Document | GraphWorX32 | Iconics, Inc. |
| .GDF | Eytan Adar | Gegevensbestanden | GUESS Graph Data Format File | GUESS | Eytan Adar |
| .GDP | Open Source | Gegevensbestanden | Scrolling Game Development Kit Project | The Scrolling Game Development Kit | Open Source |
| .GDR | Nokia | Gegevensbestanden | Symbian OS Font File | Symbian OS | Nokia |
| .GDS | Cadence Design Systems | Gegevensbestanden | Graphic Data System File | Juspertor LayoutEditor | Juspertor |
| .GDT | Open Source | Gegevensbestanden | Gretl Data File | gretl | Open Source |
| .GDV | SmartWare Corporation | Gegevensbestanden | SmartWare Graphics Screen Driver | SmartWare | SmartWare Corporation |
| .GEB | Peter Gebhard | Gegevensbestanden | Dr. Hardware File | Dr. Hardware | Peter Gebhard |
| .GED | Thoughtful Creations | Gegevensbestanden | GEDCOM Genealogy Data File | Ages! | Jörn Daub e.K. |
| .GEDCOM | Open Source | Gegevensbestanden | GEDCOM Genealogy File | Ancestral Author | Ancestral Softworks |
| .GEF | Open Source | Gegevensbestanden | Geotechnical Exchange Format File | GEF plot | Open Source |
| .GEN | Sega | Gegevensbestanden | Sega Genesis ROM | Kega Fusion | Steve Snake |
| .GENBANK | National Center for Biotechnology Information | Gegevensbestanden | GenBank Data | Genome Compiler | Genome Compiler Corporation |
| .GEO | Redway3d and others | Gegevensbestanden | VRML Geography File | TurboCAD | IMSI/Design, LLC |
| .GEV | Frogdance Software | Gegevensbestanden | GelEval Document | GelEval | Frogdance Software |
| .GFC | Patton & Patton Software | Gegevensbestanden | Patton&Patton Flow Charting 4 Flowchart Drawing | Flow Charting | Patton & Patton Software |
| .GFF | Roche Sequencing Solutions, Inc. | Gegevensbestanden | SignalMap Gene-Finding Format Data File | SignalMap | Roche Sequencing Solutions, Inc. |
| .GFI | Intuit, Inc. | Gegevensbestanden | GIFI File | Intuit TurboTax | Intuit, Inc. |
| .GFL | GiliSoft | Gegevensbestanden | File Lock Pro Encrypted Archive | File Lock Pro | GiliSoft |
| .GFS | Glarysoft Ltd. | Gegevensbestanden | Glarysoft Split File | Glary Utilities 5 | Glarysoft Ltd. |
| .GGB | Markus Hohenwarter | Gegevensbestanden | GeoGebra Document | GeoGebra | Markus Hohenwarter |
| .GGI | The GGI Project | Gegevensbestanden | General Graphics Interface File | General Graphics Interface | The GGI Project |
| .GGM | Sharon Dugdale and David Kibbey | Gegevensbestanden | Green Globs & Graphing Equations Saved State File | Green Globs & Graphing Equations | Sharon Dugdale and David Kibbey |
| .GHT | Symantec Corporation | Gegevensbestanden | Norton Ghost Project | Norton Ghost | Symantec Corporation |
| .GIB | New England Software | Gegevensbestanden | Graph-in-the-Box Chart File | Graph in the Box | New England Software |
| .GIL | Unknown Developer | Gegevensbestanden | GILS Document | Python | Python Software Foundation |
| .GIM | Sony | Gegevensbestanden | PlayStation Portable Image File | RCO Editor | Open Source |
| .GIS | Zaplots Games, Inc. | Gegevensbestanden | CFS Console Game Installer Settings File | CFS Console | Zaplots Games, Inc. |
| .GITMODULES | Open Source | Gegevensbestanden | Git Module | Git | Open Source |
| .GIW | New England Software | Gegevensbestanden | Graph-in-the-Box For Windows Presentation | Graph-in-the-Box | New England Software |
| .GIX | Microsoft Corporation | Gegevensbestanden | Genigraphics Graphics Link Presentation File | Microsoft PowerPoint | Microsoft Corporation |
| .GJF | Gaussian, Inc. | Gegevensbestanden | Gaussian Input Data File | Gaussian | Gaussian, Inc. |
| .GL3 | Unknown Developer | Gegevensbestanden | Green Line File | Unknown Software | Unknown Developer |
| .GLF | Vladimir Romanyuk | Gegevensbestanden | Space Engine Shader File | Space Engine | Vladimir Romanyuk |
| .GLG | Cadence Design Systems | Gegevensbestanden | MicroSim PCBoard Photoplot Job | OrCAD PCB Designer | Cadence Design Systems |
| .GLK | Microsoft Corporation | Gegevensbestanden | Microsoft Groove Shortcut | Microsoft Office | Microsoft Corporation |
| .GLO | Adobe Systems Incorporated | Gegevensbestanden | RoboHelp Glossary File | Adobe RoboHelp | Adobe Systems Incorporated |
| .GLP | EIVA a/s | Gegevensbestanden | NaviEdit Geoconsult Long Profile | NaviEdit | EIVA a/s |
| .GLS | Babylon Software Ltd. | Gegevensbestanden | Babylon Glossary File | Babylon | Babylon Software Ltd. |
| .GLT | Sothink | Gegevensbestanden | Sothink Glanda Data File | Glanda | Sothink |
| .GLY | Microsoft Corporation | Gegevensbestanden | Word Glossary File | Microsoft Word | Microsoft Corporation |
| .GLZ | CPT | Gegevensbestanden | Crossword Power Tools Crossword Library File | Crossword Power Tools | CPT |
| .GM81 | YoYo Games | Gegevensbestanden | GameMaker Data | GameMaker Studio | YoYo Games |
| .GMA | Garry Newman | Gegevensbestanden | Garry's Mod Addon File | Facepunch Studios Garry's Mod | Garry Newman |
| .GMAP | Garmin | Gegevensbestanden | Garmin Map File | Garmin BaseCamp | Garmin |
| .GMD | YoYo Games | Gegevensbestanden | Game Maker Program Code | GameMaker Studio | YoYo Games |
| .GML | Galdos Systems, Inc. | Gegevensbestanden | Geography Markup Language File | Canvas X | ACD Systems |
| .GMP | Blue Marble Geographics | Gegevensbestanden | Global Mapper Package File | Global Mapper | Blue Marble Geographics |
| .GMS | Open Source | Gegevensbestanden | Gesture And Motion Signal File | libGMS | Open Source |
| .GMT | Image Space Incorporated | Gegevensbestanden | rFactor Model File | Zanoza ZModeler | Zanoza Software |
| .GMV | GenSoft | Gegevensbestanden | Gens Game Recording | Gens | Open Source |
| .GMX | YoYo Games | Gegevensbestanden | GameMaker File | GameMaker Studio | YoYo Games |
| .GNA | Microsoft Corporation | Gegevensbestanden | Genigraphics Graphics Link Presentation File | Microsoft PowerPoint | Microsoft Corporation |
| .GNF | Tom Pycke | Gegevensbestanden | GluonPilot Navigation File | Gluonpilot navigation file | Tom Pycke |
| .GNH | GravoGraph | Gegevensbestanden | GravoStyle Data | GravoStyle | GravoGraph |
| .GNL | Micro Focus International plc | Gegevensbestanden | GNT Analyzer Result Data | GNT Analyzer | Micro Focus International plc |
| .GNO | GenoPro, Inc. | Gegevensbestanden | GenoPro Genealogy Tree File | GenoPro | GenoPro, Inc. |
| .GNU | Sublime HQ Pty Ltd | Gegevensbestanden | GNU Licence Information | Sublime Text | Sublime HQ Pty Ltd |
| .GNX | Microsoft Corporation | Gegevensbestanden | Microsoft PowerPoint Data | Microsoft PowerPoint | Microsoft Corporation |
| .GOH | Geoworks Ensemble | Gegevensbestanden | Geoworks GOC Header File | Unknown Software | Unknown Developer |
| .GOLD | Interscape | Gegevensbestanden | Gnome Desktop Data | GNOME Desktop | Interscape |
| .GOP | Fine Software | Gegevensbestanden | Geo5 File | Geo5 | Fine Software |
| .GP3 | Arobas Music | Gegevensbestanden | Guitar Pro 3 File | Music Guitar Pro | Arobas Music |
| .GPC | CÍGLER SOFTWARE, a.s. | Gegevensbestanden | ABO Financial Exchange Message | Money S3 | CÍGLER SOFTWARE, a.s. |
| .GPH | StataCorp | Gegevensbestanden | Stata Graph Data | Stata | StataCorp |
| .GPI | Garmin | Gegevensbestanden | Garmin Point Of Interest File | Garmin POI loader | Garmin |
| .GPJ | Green Hills Software | Gegevensbestanden | MULTI IDE Project File | Green Hills MULTI IDE | Green Hills Software |
| .GPL | Open Source | Gegevensbestanden | GNU Public License Text File | Microsoft Notepad | Microsoft Corporation |
| .GPP | Open Source | Gegevensbestanden | Guitar Practiced Perfectly 2 Data File | Guitar Practiced Perfectly version 2 | Open Source |
| .GPR | Molecular Devices | Gegevensbestanden | GenePix Results File | Microsoft Excel | Microsoft Corporation |
| .GPT | Gerber Technology | Gegevensbestanden | Gerber Top Pad Master Data | Altium Designer | Altium |
| .GPZ | IBM | Gegevensbestanden | IBM DB2 Document Manager Document History Data | IBM DB2 | IBM |
| .GQ | Unknown Developer | Gegevensbestanden | QLFC Archive Or Epson Printer Page Description Language | Unknown Software | Unknown Developer |
| .GQA | Hummingbird Ltd. | Gegevensbestanden | BI/Query Data Model Admin Layer | Unknown Software | Unknown Developer |
| .GR4 | Contract Telecommunication Engineering Ltd. | Gegevensbestanden | Pathloss Sharing Data | Pathloss | Contract Telecommunication Engineering Ltd. |
| .GRA | Microsoft Corporation | Gegevensbestanden | Microsoft Graph File | Microsoft Excel | Microsoft Corporation |
| .GRADS | Jörg Wegner (Joerg Wegner) | Gegevensbestanden | PINGO GrADS Data File | PINGO | Jörg Wegner (Joerg Wegner) |
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