| File extension Name |
extension description |
| .G | Gravity News Database |
| .G | BRL-CAD Geometry File [Native BRL-CAD Format] (BRL-CAD Development Team and US Army) |
| .G | Garabatos Genome File |
| .G | ANTLR Options File (Terence Parr and Colleagues) |
| .G | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .G | Cliq Accessories Datebook Schedule Group |
| .G | Paradox File |
| .G | Ashton Tate Applause Chart |
| .G++ | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .G01 | MicroSim PCBoard Photoplot Artwork File (Cadence) |
| .G01 | HEC-RAS Geometry File (U.S. Army Corps of Engineers) |
| .G02 | HEC-RAS Geometry File (U.S. Army Corps of Engineers) |
| .G02 | MicroSim PCBoard Photoplot Artwork File (Cadence) |
| .G03 | MicroSim PCBoard Photoplot Artwork File (Cadence) |
| .G03 | HEC-RAS Geometry File (U.S. Army Corps of Engineers) |
| .G04 | HEC-RAS Geometry File (U.S. Army Corps of Engineers) |
| .G04 | MicroSim PCBoard Photoplot Artwork File (Cadence) |
| .G05 | MicroSim PCBoard Photoplot Artwork File (Cadence) |
| .G05 | HEC-RAS Geometry File (U.S. Army Corps of Engineers) |
| .G06 | MicroSim PCBoard Photoplot Artwork File (Cadence) |
| .G07 | MicroSim PCBoard Photoplot Artwork File (Cadence) |
| .G08 | MicroSim PCBoard Photoplot Artwork File (Cadence) |
| .G09 | MicroSim PCBoard Photoplot Artwork File (Cadence) |
| .G10 | Garmin GPS Map File (Garmin Ltd.) |
| .G10 | MicroSim PCBoard Photoplot Artwork File (Cadence) |
| .G16 | GoldED / DOS Compiled Configuration |
| .G18 | Recomposer MIDI Sequencer Music File |
| .G1A | Casio Model 9860 Add-in (Casio Computer Co., Ltd.) |
| .G1E | Casio Model 9860 eActivity (Casio Computer Co., Ltd.) |
| .G1L | Casio Model 9860 File (Casio Computer Co., Ltd.) |
| .G1M | Casio Model 9860 BASIC Program (Casio Computer Co., Ltd.) |
| .G1N | Casio Model 9860 File (Casio Computer Co., Ltd.) |
| .G1R | Casio Model 9860 Image File (Casio Computer Co., Ltd.) |
| .G2A | GoToAssist Session File (Citrix Online, LLC.) |
| .G3 | G3 FAX File |
| .G32 | GFA BASIC 32 Program File |
| .G32 | PaperPort Application Link File (32-bit) (ScanSoft Inc.) |
| .G36 | Recomposer MIDI Sequencer Music File |
| .G3D | GenDesigner 3.x Genealogy Database |
| .G3F | Zetafax Fine Resolution TIFF File (Equisys) |
| .G3N | Zetafax Normal Resolution TIFF File (Equisys) |
| .G3S | Goletas 3S Triangle Studio Project (Maksim Goleta) |
| .G3X | RealFlight Radio Control Photofield File (Knife Edge Software) |
| .G4 | Access (Microsoft Corporation) |
| .G4 | GTX RasterCAD File |
| .G42 | DLS/32 Supply Chain Planning (Adapta) |
| .G4B | Sokoban++ Level File |
| .G53 | DLS/32 Supply Chain Planning (Adapta) |
| .G64 | C64 Emulator Disk Image |
| .G8 | PicLab Plane Three Graphics |
| .G8 | PictureMaker Green Channel Image Data (Cubicomp) |
| .G9 | Gest Data File (Arktec, S.A.) |
| .G99 | HEC-RAS Geometry File (U.S. Army Corps of Engineers) |
| .GAB | WINDEV Controls' Styles Description (PC SOFT) |
| .GAB | Connectivity Memory Model Axo-axonic Connections Onto Presynaptic Terminals Input File |
| .GAB | Global Address Book Export File (Dencom) |
| .GAC | Global Audio Control Skin |
| .GADGET | Microsoft Gadget (Microsoft Corporation) |
| .GAF | Total Annihilation |
| .GAK | Win32 Shellext File |
| .GAL | Corel Multimedia Manager Album |
| .GAL | GenePix Array List (Molecular Devices Corporation) |
| .GAL | Hewlett-Packard Graphics Gallery |
| .GAL | Gallery of Pictures |
| .GALLERYITEM | SMART Notebook (SMART Technologies ULC) |
| .GAM | Dark Engine Games (Looking Glass Studio) |
| .GAM | GammaFax Fax Document |
| .GAM | Baldur's Gate Game File |
| .GAM | Cyberboard Game (Dale Larson) |
| .GAM | MacMolPlt GAMESS Input format |
| .GAM | Tasc Chess CD II Saved Game (Tasc) |
| .GAM | Infinity Game Engine Saved Game (BioWare Corp.) |
| .GAM | TADS Ver. 2.x Game File |
| .GAM | Rise of Nations Saved Game (Microsoft Corporation) |
| .GAM | RPG Toolkit Game Project (Christopher Matthews) |
| .GAM | Klik'n'Play Game (Clickteam) |
| .GAM | Vectrex Game |
| .GAM | Astro-PC Astrology Data File (Aureas Software & Publishing) |
| .GAM | The Games Factory Game (Clickteam) |
| .GAME | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GAMES | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GAML | Generalized Analytical Markup Language |
| .GAN | GanttProject Project Plan File |
| .GANI | Graal Game Animation |
| .GAP | Electrical Generation Analysis and Planification |
| .GAR | GPS_COM Waypoint Data (AviaDBM) |
| .GARDE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GAS | Grab-a-Site Project File (BlueSquirrel) |
| .GAS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GAS | Intelligence Tracking System Data File |
| .GAT | Gator File |
| .GAT | Genetic Algorithm Timetabler (GATTer) Configuration and Information File (Chris Skardon) |
| .GAU | Flight Simulator Gauge (Microsoft Corporation) |
| .GAU | Gaussian Input File (MDL Information Systems, Inc.) |
| .GAUSS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GAUSS2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GAX | Age of Empires II: The Conquerors Expansion Saved Game (Microsoft Corporation) |
| .GAX | Rise of Nations Saved Game (Microsoft Corporation) |
| .GAY | Reported as Sometimes a Porn File |
| .GB | GenBank Sequence Record |
| .GB | Printfox/Pagefox Graphic |
| .GB | Nintendo GameBoy Emulator ROM Image File (Nintendo) |
| .GB | CEDICT Chinese/English Dictionary (Erik E. Peterson) |
| .GB$ | BASIC VB Beispiel Kartei File |
| .GB1 | Game Maker Backup (YoYo Games Limited) |
| .GBA | GrabIt Batch Files |
| .GBA | Nintendo Game Boy Advance ROM Image (Nintendo) |
| .GBC | Nintendo GameBoy Color Emulator ROM Image File (Nintendo) |
| .GBD | Great Budget Budget Definition File (Great Budget Software) |
| .GBD | Gator Banner File |
| .GBF | InteGrade Pro Gradebook File |
| .GBF | Great Budget Fringe Definition File (Great Budget Software) |
| .GBF | GTrek GPS Binary File (GTrek Ltd) |
| .GBFS | GBFS Archive (Pin Eight) |
| .GBI | gBurner Image (gBurner Systems, Inc.) |
| .GBK | Interbase Database Backup |
| .GBL | VAXTPU Global Definitions |
| .GBL | Visual Basic Global Definition |
| .GBL | Gravityball File (William D. Hause) |
| .GBOOK | The Guest Book Egbook file |
| .GBR | GIMP Brush File (The GIMP Team) |
| .GBR | Gerber Format File |
| .GBS | Nintendo Gameboy Music/Audio Data (Nintendo) |
| .GBS | GTrek Collective GPS Binary File (GTrek Ltd) |
| .GBS | Gameshark Online Save/Snapshot |
| .GBSCR | GreenBlue Services Script (Ecyware) |
| .GBT | Photoshop (Adobe Systems Incorporated) |
| .GBX | Cyberboard Gamebox (Dale Larson) |
| .GBX | Nadeo Games File Format (Nadeo) |
| .GBX | Gerber File |
| .GBX | Great Budget Budget File (Great Budget Software) |
| .GBX | Game Data Package |
| .GC | Sierra Print Artist Greeting Card |
| .GC1 | Golden Common Lisp 1.1 Source Code |
| .GC3 | Golden Common Lisp 3.1 Source Code |
| .GCA | GOCA Graphics File |
| .GCA | G Compression Archiver Compressed File |
| .GCB | Guitar Chord Buster |
| .GCC | Gnu C++ File |
| .GCC | VISUAL EPR COSEUL.EXE Result |
| .GCD | GraphiCAD Data File (GraphiTech Ltd.) |
| .GCD | General Content Descriptor (Sprint Nextel) |
| .GCD | GNUe Class Definition |
| .GCD | Prassi CD Image (Prassi Technology) |
| .GCD | Generic CADD Drawing |
| .GCD | CD Ghost Task |
| .GCF | Graphing Calculator (Pacific Tech) |
| .GCF | Global Virtual Accademy GVA XT Author File |
| .GCF | Half-Life Game Cache File (Sierra Entertainment, Inc.) |
| .GCF | WinXComp Grouped Compressed File |
| .GCF | Greeting Card Creator Project (ArcSoft) |
| .GCF | Valve Game Cache File (Valve Corporation) |
| .GCG | GCG 8 Sequence Chemical File |
| .GCI | Sonic Adventure DX Saved Game File (Sega of America, Inc.) |
| .GCI | Visual EPR COSEUL.EXE Result |
| .GCI | GTA2 Game File |
| .GCK | NICET Fire Alarm Test-Prep Software Tracking File (Zenith Design Group, Inc.) |
| .GCK | Giants: Citizen Kabuto Customized Map (Planet Moon Studios) |
| .GCM | GeoConcept Map File (GeoConcept SA) |
| .GCM | Group Mail CMessage Store File |
| .GCM | GameCube Image File (Nintendo) |
| .GCO | Genbox Family History Chart Options (Thoughtful Creations) |
| .GCP | Ground Control Point File |
| .GCP | Spectramap Group Properties (Coloritto BV) |
| .GCR | Visual EPR COSEUL.EXE Output |
| .GCR | GlowCode Profiling Results (Electric Software, Inc.) |
| .GCS | GameShark SharkSave for GameCube |
| .GCT | ApplinX Screen Scrapper |
| .GCV | 3D SexVilla Game Movie (thriXXX) |
| .GCX | Grapher Graph Formula and Specifications (Apple Inc.) |
| .GD2 | GDLib Image |
| .GD3 | GreatFamily Family Tree Project (GreatProgs) |
| .GDA | [Unknown] |
| .GDA | Unix Man Page Guide |
| .GDB | GetPicturesList Image Location Database (Tracking-Celebs.info) |
| .GDB | ACT! Group Data File (Best Software CRM Division) |
| .GDB | ProMaster Key Manager Key Management Database (Westorn House Software) |
| .GDB | Group Mail File |
| .GDB | ArcView Geodatabase (ESRI) |
| .GDB | MoneyWorks Main Database (GenSoft Ltd.) |
| .GDB | Formula 1 Car Race 2001 Season01 File |
| .GDB | MapSource GPS Waypoint Database (Garmin Ltd.) |
| .GDB | Firebird Database (Firebird Foundation Incorporated) |
| .GDB | GVA2000 Author Lecture (Youngsan Info & Communication Co., Ltd.) |
| .GDB | Interbase Database |
| .GDB | GardenBoss Design File (RedBog Software) |
| .GDF | IBM Graphics Data Format Bitmap |
| .GDF | GEOS Dictionary |
| .GDF | GRAFIK Eye Designer Project File (Lutron Electronics, Inc.) |
| .GDF | Quartus II Graphic Design File (Altera Corporation) |
| .GDF | FutuRUG Group Definition File (Two Brothers Software) |
| .GDF | GlossTeX Definition File |
| .GDF | 3DMove 3D Geological Model (Midland Valley Exploration) |
| .GDG | ReliaSoft RG |
| .GDI | Generic Download Install File (SamattRPG Technologies) |
| .GDK | OS/2 Saved SKF Format File (IBM) |
| .GDM | Bells, Whistles, and Sound Boards Module |
| .GDP | Scrolling Game Development Kit Project File (Benjamin Marty) |
| .GDR | SymbianOS Bitmap Font File |
| .GDR | GRAFIK Eye Designer User Information (Lutron Electronics, Inc.) |
| .GDS | Image File |
| .GDS | Chip Layout Information |
| .GDS | McDonnell-Douglas Things |
| .GDT | Genbox Family History Dictionary (Thoughtful Creations) |
| .GDT | Guitar & Drum Trainer Song Configuration File (Renegade Minds) |
| .GDW | GedStar Pro Configuration (GHCS Software) |
| .GDW | gINT Drawing (gINT Software, Inc.) |
| .GE | Gecho Configuration File |
| .GE3 | Mastercam Geometry File (CNC Software, Inc.) |
| .GE3 | Mastercam Mill Tool Library (CNC Software, Inc.) |
| .GE80 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GEA | Fifa World Cup Game Data fe Art Legalscr File |
| .GEANT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GEAR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GEB | DR Hardware File |
| .GED | GEDCOM Family History File |
| .GED | Family Historian Native Data Format (GEDCOM File) (Calico Pie Limited) |
| .GED | Micrografx Simply 3D Geometry |
| .GED | Graphic Environment Document |
| .GED | Arts & Letters Graphics (Arts & Letters Corporation) |
| .GED | Game Editor Project File (Game Editor) |
| .GED | GoldED / DOS Compiled Configuration File |
| .GED | EnerGraphics File |
| .GED | Wicat Image |
| .GEDCOM | Various Programs Data File |
| .GEDTD | Get 'em Done ToDo Data File (StudyLamp Software) |
| .GEF | Geotechnical Exchange Format (GEONET) |
| .GEF | Graphics Exchange Format |
| .GEF | GE Industrial Systems CIMPLICITY Workbench |
| .GEM | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GEM | Ventura Publisher Vector Graphics |
| .GEM | GEM File |
| .GEM | Digital Research GEM Paint |
| .GEN | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GEN | ArcView ARC/INFO UnGenerate Format (ESRI) |
| .GEN | ToGenBank Format |
| .GEN | Generations Embroidery Software Design File (Notcina Corporation) |
| .GEN | Chromeleon Generic Driver Configuration |
| .GEN | Ventura-Generated Text File |
| .GEN | dBASE Application Generator Compiled Template |
| .GEN | Daqarta Extended Audio Data (Interstellar Research) |
| .GEN | Genius Family Tree Data |
| .GENERAL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GENIE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GENKEY | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GEO | VideoScope File |
| .GEO | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GEO | VideoScape 3D Object |
| .GEO | Trumpf ToPs File |
| .GEO | Homeworld Geometry File (Sierra) |
| .GEO | GoldED / OS/2 Compiled Configuration File |
| .GEO | Geoworks Geode |
| .GEO | GeoPaint |
| .GEO | eXplorist GPS Geocache Manager Database File (Thales Navigation, Inc.) |
| .GEO | GeoSoft Compressed Add-on |
| .GEOG | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GER | GerberView File |
| .GER | German Text/HTML Info File |
| .GER | Pro/ENGINEER Temporary File (PTC) |
| .GERMAN | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GESTION | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GET | Pov-ray for Windows (Persistence of Vision Raytracer Pty Ltd.) |
| .GET | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GETBILL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GETRIGHT | GetRight Download in Progress (Headlight Software, Inc.) |
| .GETVERS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GEX | GEcho Configuration File |
| .GF | METAFONT Generic Font File |
| .GF | Pilot Logbook for Grok File |
| .GF | Starfleet Command - Empires At War File |
| .GF | Geometric Data |
| .GF | gFx UNIX Plotting Program |
| .GF | FlowerThinger Garden File (PingerThinger.com) |
| .GFA | GFA-BASIC 32 ATARI Tokenized Source Ver. 2.x (GFA Software Technologies) |
| .GFA | GFA-BASIC 32 ATARI Tokenized Source Ver. 2.x (Protected) (GFA Software Technologies) |
| .GFA | GFA-BASIC MS-DOS Tokenized Source (GFA Software Technologies) |
| .GFA | Bitmap Graphic |
| .GFB | GIFBlast Compressed GIF Image |
| .GFC | Patton & Patton Flowcharting 4 File |
| .GFD | Menus for GNUe Forms |
| .GFD | VISUAL EPR Energy, Fields File |
| .GFD | GeForms (Gadwin Systems, Inc.) |
| .GFF | SignalMap Gene-Finding Format (GFF) Data File (NimbleGen Systems Inc.) |
| .GFI | Genigraphics Graphics Link Presentation |
| .GFL | GeForms (Gadwin Systems, Inc.) |
| .GFM | Ashton Tate Applause CGM Picture |
| .GFM | Computer Graphics Meta-file |
| .GFO | SGI Radiosity |
| .GFS | GGFileSPlit File Fragment (GGNetworks) |
| .GFS | Office Groove Partial Download File (Microsoft Corporation) |
| .GFS | Immersioni Underwater Decompression File (Mario Giuseppe Leonardi) |
| .GFT | GeForms Form Template (Gadwin Systems, Inc.) |
| .GFT | GSP Family Tree (Global Software Publishing Limited) |
| .GFT | NeoPaint Font |
| .GFW | ArcView World File For GIF Image (ESRI) |
| .GFW | BASIC GFA File |
| .GFX | Instant Artist image |
| .GFX | Genigraphics Graphics Link Presentation |
| .GFX | Cue Club Image File |
| .GFX | RSView Machine Edition Graphics Display (Rockwell Automation, Inc.) |
| .GFX | WarCraft II Image File (Blizzard Entertainment) |
| .GFX | Print Artist |
| .GFX | The Games Factory Extension (Clickteam) |
| .GFY | Grafical 1.0 File |
| .GG | Gridgen File |
| .GG | Koala Paint Compressed File |
| .GG | Sega GameGear Game ROM Image (Sega of America, Inc.) |
| .GG | Sigmac Compiled Machine Code |
| .GG | Gridgen Grid (Pointwise, Inc.) |
| .GG | Google Desktop Gadget (Google) |
| .GG1 | Goofy Golf Deluxe Course |
| .GG2 | Goofy Golf Deluxe Saved Game |
| .GGDB | GGNetworks Database (GGNetworks) |
| .GGE | Green Globs & Graphing Equations Saved Graphing Equations (Dugdale and Kibbey Consulting) |
| .GGF | GPS Pathfinder Office Geoid Grid File (Trinble Navigation Limited) |
| .GGG | Green Globs & Graphing Equations Record Games and License Information (Dugdale and Kibbey Consulting) |
| .GGI | GGI Extension |
| .GGM | Green Globs & Graphing Equations Partial or Complete Saved Game (Dugdale and Kibbey Consulting) |
| .GGP | GemCom Graphic Format |
| .GGR | GIMP Gradient (The GIMP Team) |
| .GGS | Gameboy Emulator File |
| .GGX | Green Globs & Graphing Equations List of GGG Records Files (Dugdale and Kibbey Consulting) |
| .GHI | NCSA Mosaic Configuration File |
| .GHO | Ghost Disk Image File (Symantec Corporation) |
| .GHOST | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GHS | Glider Pro House File (John Calhoun) |
| .GHS | Tarshare File |
| .GHS | Ghost Disk Image Span File (Symantec Corporation) |
| .GHS | Lasertank High Scores |
| .GI | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GI | Sonic RecordNow! CD Image (Hewlett-Packard Development Company, L.P.) |
| .GI | Prassi or PrimoDVD Image |
| .GI | Audio Utility Tuningwrench Compressed File |
| .GI | Sony CD Extreme Global Image File |
| .GIB | Graph-in-the-Box Chart |
| .GIC | BioWare Aurora Engine Area (BioWare Corp.) |
| .GID | GiD Project Directory (CIMNE (The International Center for Numerical Methods in Engineering)) |
| .GID | Windows Help Index File (Microsoft Corporation) |
| .GIF | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GIF | Graphic Interchange Format |
| .GIF2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GIF2 | Netobjects Fusion Styles Lines File |
| .GIF87 | GIF87 File |
| .GIF89A | Gif 89a Image File |
| .GIFA | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GIFAR | GIF With Java ARchive |
| .GIFENX | egis Encrypted GIF File (HiTRUST Inc.) |
| .GIFF | Graphic Interchange Format |
| .GIG | GigaStudio Sound Bank (TASCAM) |
| .GIH | GIMP Animated Brush (The GIMP Team) |
| .GIL | GILS Document |
| .GILS | GILS Document |
| .GIM | Genigraphics Graphics Link Presentation |
| .GIM | Playstation 3 Icon File (Sony Corporation of America) |
| .GINT | Gintor Download Assistant Control File |
| .GIO | Nyquist V2.10 Test File |
| .GIR | Gens Plus! Movie Capture |
| .GIRL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GIS | ERDAS IMAGINE Gray-scale Bitmap Image (Leica Geosystems , LLC) |
| .GIT | BioWare Aurora Engine Area (BioWare Corp.) |
| .GIW | Graph-in-the-Box Presentation |
| .GIX | Genigraphics Graphics Link Presentation |
| .GJD | 11th Hour Game Archive |
| .GJD | GetJet Professional Database |
| .GJD | 7th Guest Game Archive |
| .GJF | Gaussian Input Data File |
| .GJT | GAJET Input Data File (UK Health and Safety Laboratory) |
| .GKA | GKWIN (Matsushita Electric Works UK Limited) |
| .GKB | General Knowledge Base Database (Baltsoft) |
| .GKH | Ensoniq EPS Family Disk Image (E-MU Systems) |
| .GKS | Graphics Kernel System |
| .GKS | Gravis GripKey Document |
| .GL | GRASP - Graphical System for Presentation File |
| .GL | GALink Script |
| .GL3 | Green Line File |
| .GLADE | Glade User Interface Design |
| .GLB | Global Module in Basic Program |
| .GLB | Raptor: Call Of The Shadows Support File |
| .GLD | Glide File |
| .GLD | The GUI Loft Design (Johan Lindström) |
| .GLF | Grantleigh Labels |
| .GLF | Golf Save File |
| .GLF | iGolf Golf Course File (L1 Technologies) |
| .GLF | AfterGRASP Font (John Bridges) |
| .GLF | Gridgen Tcl Script (Pointwise, Inc.) |
| .GLF | Pointwise Tcl Script (Pointwise, Inc.) |
| .GLG | MicroSim PCBoard Photoplot Job Description File |
| .GLH | Wise Installer Temporary File (Wise Solutions) |
| .GLI | GLHEPRO Input Data (James R. Cullin - Oklahoma State University) |
| .GLK | PaperPort Application Link File (16-bit) (ScanSoft Inc.) |
| .GLM | DInsight Modeling Studio 3D CAD Model (DInsight) |
| .GLM | Glim Data File |
| .GLO | Global Module in Basic Program |
| .GLO | LaTeX Auxiliary for Glossary |
| .GLO | Instant Text Glossary File (Textware Solutions) |
| .GLOBAL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GLOBALS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GLOSS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GLOSSARY | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GLOSSARYASP | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GLS | GLScript Game/Animation Script File |
| .GLS | Babylon Builder |
| .GLS | Across Data |
| .GLS | Sothink Glenda Export Shape File |
| .GLT | Sothink Glenda File |
| .GLU | Cyberglue File |
| .GLUE | GlueMon Song/Module |
| .GLUT | OpenGL Glut-3.6 File |
| .GLUT2 | OpenGL Glut-3.6 File |
| .GLUT3 | OpenGL Glut-3.6 File |
| .GLV | Glove Data File (New Planet Software) |
| .GLY | ACT! Layout (Best Software CRM Division) |
| .GLY | Word Glossary (Microsoft Corporation) |
| .GM | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GM | Autologic Bitmap |
| .GM | Transport Tycoon Game Music File |
| .GM0 | S.A.P.S. - Sharp Advanced Presentation Software Professional |
| .GM1 | Heroes of Might & Magic III Saved Game (The 3DO Company) |
| .GM1 | S.A.P.S. - Sharp Advanced Presentation Software Professional |
| .GM2 | S.A.P.S. - Sharp Advanced Presentation Software Professional |
| .GM2 | Heroes of Might & Magic III Saved Game (The 3DO Company) |
| .GM2 | Autologic Bitmap |
| .GM2 | Gens Sega Genesis Emulator Movie Capture Format (Mysticales) |
| .GM3 | S.A.P.S. - Sharp Advanced Presentation Software Professional |
| .GM3 | Heroes of Might & Magic III Saved Game (The 3DO Company) |
| .GM4 | Autologic Bitmap |
| .GM4 | S.A.P.S. - Sharp Advanced Presentation Software Professional |
| .GM4 | Heroes of Might & Magic III Saved Game (The 3DO Company) |
| .GM5 | Heroes of Might & Magic III Saved Game (The 3DO Company) |
| .GM6 | Heroes of Might & Magic III Saved Game (The 3DO Company) |
| .GM6 | Game Maker Project File (YoYo Games Limited) |
| .GM7 | Heroes of Might & Magic III Saved Game (The 3DO Company) |
| .GM8 | Heroes of Might & Magic III Saved Game (The 3DO Company) |
| .GM9 | Heroes of Might & Magic III Saved Game (The 3DO Company) |
| .GMA | S.A.P.S. - Sharp Advanced Presentation Software Professional |
| .GMANIFEST | Google Desktop Gadget Control File (Google) |
| .GMAX | gmax Game Creator (Autodesk, Inc.) |
| .GMB | Great Budget Model (Template) File (Great Budget Software) |
| .GMB | GoldMine Business Contact Management Backup Data (FrontRange Solutions Inc.) |
| .GMD | Game Maker Stored Game Under Development (YoYo Games Limited) |
| .GMD | Great Budget Model Definition for the Template (Great Budget Software) |
| .GMD | IMAGINE Graphical Model (Erdas) |
| .GME | Interact DexDrive Playstation Memory Card Save |
| .GME | GunBound Main GunBound Executable (Softnyx) |
| .GME | Multi Game Memory Editor Main Game File (Opencoding.net) |
| .GMF | Robot Arena: Design & Destroy Graphic (Gabriel Group, Inc.) |
| .GMF | Great Budget Fringe Definition for the Template (Great Budget Software) |
| .GMF | Applause CGM Graphics |
| .GMI | GPS Tuner Map Calibration Data (Megalith-Systems) |
| .GMIN | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GMK | Game Maker Project File (YoYo Games Limited) |
| .GML | NetRemote XML-based Configuration File |
| .GML | Geography Markup Language |
| .GML | Graphlet Graphscript File |
| .GML | Game Maker Script (YoYo Games Limited) |
| .GMLWB | Garry's Mod Lua Weapons Builder Project File (Happymax) |
| .GML_BBCRSSINTCLUSTER | BBC Alerts (BBC) |
| .GMM | Group Mail Message Log File |
| .GMM | GMT Player Live Media Feed (GGMMTV Ltd.) |
| .GMMOD | Model Creator Game Maker Model File (Matrebatre) |
| .GMMP | Windows Color System Gamut Map Model Profile (GMMP) (Microsoft Corporation) |
| .GMO | GNU Gettext GNU Machine Object File (Free Software Foundation) |
| .GMP | Geomorph Tile Map |
| .GMP | Group Mail List Information File |
| .GMP | GTA2 Game File |
| .GMP | Railroad Tycoon 3 Scenarios and Saved Games (PopTop Software Inc.) |
| .GMP | GUEmap Document (Christopher J. Madsen) |
| .GMR | Schlafhorst Automation Graphical Monitor Record |
| .GMR | Game Maker Compiled Game (YoYo Games Limited) |
| .GMS | Corel Graphics10 Draw File |
| .GMS | Corel Global Macro File |
| .GMT | Scarlett Expert System Compiler Grammar File |
| .GMT | GMT Player Live IPTV Feed (GGMMTV Ltd.) |
| .GMV | GMV (General Mesh Viewer) Input File (Los Alamos National Security, LLC) |
| .GMV | Cyberboard Move (Dale Larson) |
| .GMV | Gens Movie Capture |
| .GMX | Group Mail Message File |
| .GNA | Genigraphics Graphics Link Presentation |
| .GNE | Flickr PHP File (Yahoo! Inc.) |
| .GNI | VisiDAQ Strategy File (Visidaq Solutions, Inc.) |
| .GNM | Generator GNM Output Log/Music |
| .GNO | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GNO | Genopro Genealogy Document File (Genogram) (GenoPro Inc.) |
| .GNT | Micro Focus Generated COBOL Code |
| .GNUMERIC | Gnumeric Default XML-based File (GNOME Foundation) |
| .GNUPLOT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GNX | Genigraphics Graphics Link Presentation |
| .GO | GraphOn Bitmap Image |
| .GO | CompuServe (CompuServe) |
| .GO1 | Wingames Go File |
| .GOA | SpiceCAD File |
| .GOAL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GOB | Dark Forces Game Archive (Lucasfilm Entertainment Company Ltd.) |
| .GOB | Jedi Knights Game Archive (Lucasfilm Entertainment Company Ltd.) |
| .GOB | Indiana Jones 3D Game Archive (Lucasfilm Entertainment Company Ltd.) |
| .GOBJ | Geoworks Object Code |
| .GOC | Geoworks GOC Source Code |
| .GOD | Payvision BV Gamelauncher Games on Demand Volume (Payvision) |
| .GODD | G.O.D Arena Partial Downloaded Game File (Games On Demand ( Australia ) Pty. Ltd. (G.O.D)) |
| .GOE | McIDAS System Satellite Image Data |
| .GOES | McIDAS System Satellite Image Data |
| .GOGO | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GOH | Geoworks GOC Header |
| .GOLD | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GOLDFONT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GOLF | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GOO | Kai's Power Goo / Kai's Supergoo |
| .GOODBYE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GOODE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GOODNESS | Goodness File |
| .GOODS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GOOK | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GOR | Gorilla |
| .GOTHIC | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GOULD | Gould Scanner Bitmap |
| .GOV | Netmino File |
| .GOX | The Games Factory Extension (Clickteam) |
| .GP | Geoworks Glue Geode Parameter File |
| .GP | Gofer Project |
| .GP1 | Gerber Printed Circuit File |
| .GP1 | Street Atlas GPS Log (Delorme) |
| .GP3 | Guitar Pro Ver. 3 Tablature (Arobas Music) |
| .GP3 | CCITT Group 3 File |
| .GP4 | CCITT Group 4 File |
| .GP4 | GTX Group IV Format /CALS Picture |
| .GP4 | Guitar Pro Ver. 4 Tablature (Arobas Music) |
| .GP5 | Guitar Pro Ver. 5 Tablature (Arobas Music) |
| .GPD | Generic Printer Description Unidrv Minidriver (Microsoft Corporation) |
| .GPD | VISUAL EPR Input Data for PARAMS.EXE |
| .GPF | Ragnarok Online Gravity Re-Packed File (Gravity Co., Ltd. & Lee Myoungjin) |
| .GPG | GNU Privacy Guard (GnuPG) Public Keyring (Free Software Foundation, Inc.) |
| .GPH | 1-2-3 Graph (IBM) |
| .GPH | Stata Graph |
| .GPH | Freelance Graphics for OS/2 (IBM) |
| .GPH | Pro/ENGINEER (PTC) |
| .GPI | Bitware Fax File |
| .GPI | Garmin Point of Interest File (Garmin Ltd.) |
| .GPJ | jGRASP Project Metadata (Auburn University) |
| .GPJ | Autorun-Autoplay Tools Project File (GS Technology Works LLC dba GS Technologies) |
| .GPJ | Grapher Worksheet Project (Golden Software, Inc.) |
| .GPJ | Grapher Project File (Golden Software, Inc.) |
| .GPJ | gINT Project File (gINT Software, Inc.) |
| .GPJ | Xpower Project (PaulMace Software Inc.) |
| .GPK | GEOPAK Coordinate Geometry Database (Bentley Systems, Incorporated) |
| .GPK | WaveLab Peak File (Steinberg) |
| .GPK | Geos Compressed Omnigo File Archive |
| .GPK | Omnigo Program Package |
| .GPL | GenePix Lab Book (Molecular Devices Corporation) |
| .GPL | GetPicturesList URL Conversion Rule (Tracking-Celebs.info) |
| .GPL | GPS Log File |
| .GPL | XMap GPS Log File (Delorme) |
| .GPLT | Gnuplot Plot Files |
| .GPM | Crossword Puzzle |
| .GPN | gp-Untis Timetable Database (Gruber & Petters GmbH) |
| .GPN | GlidePlan Map Document (GlidePlan Inc.) |
| .GPP | GraphPap Graph Paper File |
| .GPP | Serif GraphicsPlus Object |
| .GPR | VISUAL EPR PARAMS.EXE Results |
| .GPR | GenePix Results (Molecular Devices Corporation) |
| .GPR | GMS Project File (Environmental Modeling Systems, Inc.) |
| .GPS | Pocket CoPilot GPS Tracks Data File |
| .GPS | GenePix Settings (Molecular Devices Corporation) |
| .GPS | BPM Studio File/Play List Structure (ALCATech) |
| .GPS | Tripod Data Systmes Survey Pro GPS Coordinate File |
| .GPS | MicroImages GPS Log File (MicroImages, Inc.) |
| .GPT | MicroImages Text Group (MicroImages, Inc.) |
| .GPT | MOPAC Graph File (CambridgeSoft Corporation) |
| .GPX | Garmin GPS Data (Garmin Ltd.) |
| .GPX | GraphX Document (FlexSoft) |
| .GPX | GPS eXchange Format (TopoGrafix) |
| .GPX | BASIS File |
| .GPZ | Msdev Common Ide Utility Projects File |
| .GQ | QLFC Compressed Archive |
| .GQ | Epson Printer Page Description Language (Epson Corporation) |
| .GQA | BI/Query Data Model Admin Layer |
| .GQL | BI/Query Data Model |
| .GQU | BI/Query Data Model User Layer |
| .GR | XGMML (eXtensible Graph Markup and Modeling Language) File |
| .GR2 | Windows 3.0 Screen Driver |
| .GR2 | Granny Game Content File (RAD Game Tools, Inc.) |
| .GR3 | Windows 3.0 Screen Grabber |
| .GR4 | Pathloss Network File Sharing File |
| .GRA | OpenGL Object |
| .GRA | Graph Chart (Microsoft Corporation) |
| .GRA | Notes 5 Language Dictionary File (IBM) |
| .GRA | SigmaPlot Data File |
| .GRA | Flight Simulator File (Microsoft Corporation) |
| .GRA | STN Express Transcript Graphics File |
| .GRAAL | Graal Level (Cyberjoueurs) |
| .GRABBER | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GRAD | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GRADE1FONT | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GRADS | Metafile |
| .GRAFFLE | OmniGraffle Drawing (The Omni Group) |
| .GRAFSAO | Aleph One Shapes (Marathon Open Source) |
| .GRAPH | Amaya |
| .GRAPHICS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GRAPHLI | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GRASP | Animation |
| .GRAY | Raw Gray Samples |
| .GRB | Gridded Binary Image |
| .GRB | MS-DOS Shell Monitor |
| .GRB | HP-48sx Calculator GROB Graphic Object |
| .GRB | HP-48/49 GROB |
| .GRB | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GRBDROPFILE | GetRight (Headlight Software, Inc.) |
| .GRD | Gradebook Power File |
| .GRD | Golden Software Surfer |
| .GRD | 3D Garden Composer Design File (DiComp, Inc.) |
| .GRD | Grid File |
| .GRD | Photoshop Gradient File (Adobe Systems Incorporated) |
| .GRD | Drivers for GRX |
| .GRD | RockWorks Evenly-spaced XYG Data (RockWare, Inc.) |
| .GRD | StrongDisk Encrypted Disk Image (PhysTechSoft Ltd.) |
| .GRDEF | Geoworks UI resource file |
| .GRE | Webalizer.01 Language File |
| .GREY | RAW RGB 24-bit Graphic |
| .GRF | Stanford Image |
| .GRF | DLG Graphic Format |
| .GRF | Ragnarok Packed File (Gravity Co., Ltd.) |
| .GRF | Golden Software Graph File |
| .GRF | Ragnarok Online Game Archive (Gravity Co., Ltd. & Lee Myoungjin) |
| .GRF | Grafix Idea File |
| .GRF | GraphEdit Filter Graph (Microsoft Corporation) |
| .GRF | Level Up! Site Information File (Level Up!) |
| .GRF | DPlot Graph File (HydeSoft Computing, LLC) |
| .GRF | Graph |
| .GRF | Graph Plus Drawing (Corel) |
| .GRF | Insight II Standard Graph Definition File (Accelrys Software Inc.) |
| .GRFZ | DPlot Graph File (HydeSoft Computing, LLC) |
| .GRG | GreatFamily Graphic Gallery (GreatProgs) |
| .GRIB | Gridded Binary |
| .GRID | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GRK | Gradekeeper Class Gradebook (Daniel Ethier) |
| .GRK | Kreon Scanner File |
| .GRL | MATLAB Graphic Format (The MathWorks, Inc.) |
| .GRM | Minos File |
| .GRM | VISUAL EPR Input Data for FIntGraf |
| .GRN | Masterpoint Green Points File (ABF Masterpoint Centre) |
| .GRN | Drivers for GRX |
| .GRN | Granny 3D Rendering Program |
| .GRO | Serious Sam Game File (Croteam Ltd.) |
| .GRO | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GRO | Warlords Battlecry Archive (Strategic Studies Group, Pty Ltd.) |
| .GRO | Genbox Family History Report Options (Thoughtful Creations) |
| .GRO | HP-48/48sx/49 Graphic Object Bitmap (Hewlett-Packard Development Company, L.P.) |
| .GROB | HP-48/48sx/49 Graphic Object Bitmap (Hewlett-Packard Development Company, L.P.) |
| .GRP | DESQview (Symantec Corporation) |
| .GRP | Duke Nukem 3D Archive |
| .GRP | PixBase Pictures Group |
| .GRP | BPM Studio File/Play List Archive (ALCATech) |
| .GRP | Windows Program Manager Group |
| .GRP | Shadow Warrior Archive |
| .GRP | ACT! Group Data File (Best Software CRM Division) |
| .GRP | Starcraft Archive |
| .GRPH | ANSYS Plot |
| .GRQ | Quickstep Barco Graphics |
| .GRR | Gradekeeper Class Roster (Daniel Ethier) |
| .GRS | GetRight Skin (Headlight Software, Inc.) |
| .GRS | Packedge Barco Graphics |
| .GRT | MegaHAL Greeting File (Ai Research) |
| .GRT | VISUAL EPR Calculation Results of Fields |
| .GRV | Cakewalk (Cakewalk) |
| .GRV | Groove Networks File |
| .GRW | SeeYou Waypoint (Naviter) |
| .GRX | GetRight File List (Headlight Software, Inc.) |
| .GRXML | Speech Recognition Grammar Specification (W3C) |
| .GRY | RAW RGB 24-bit Graphic |
| .GRZ | GRZip Compressed Archive |
| .GRZ | GRZip II Compressed Archive |
| .GS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GS | Gofer Script |
| .GS | eXplorist GPS Geocache Waypoint File (Thales Navigation, Inc.) |
| .GS0 | Genecyst Save State 0 |
| .GS1 | GraphShow Presentation |
| .GS1 | Genecyst Save State 1 |
| .GS2 | Genecyst Save State 2 |
| .GS3 | Genecyst Save State 1 |
| .GS4 | Genecyst Save State 4 |
| .GS5 | Genecyst Save State 5 |
| .GS6 | Genecyst Save State 6 |
| .GS7 | Genecyst Save State 7 |
| .GS8 | Genecyst Save State 8 |
| .GS9 | Genecyst Save State 9 |
| .GSA | GeneStudio Alignment File (GeneStudio, Inc.) |
| .GSAGA | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GSB | Golden Software Boundary Data (Golden Software, Inc.) |
| .GSB | GeneSys Battery File (Psytech International) |
| .GSB | Gain Script Binary (AIM Software) |
| .GSBUG | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GSC | GeneStudio File |
| .GSC | IMail Server Web Messaging File (Ipswitch, Inc.) |
| .GSD | GraphTec Vector Graphic Data (GraphTec) |
| .GSD | GSM Internet Realtime Audio |
| .GSD | GSplit Piece File (G.D.G. Software) |
| .GSD | Professional Draw Vector Graphics |
| .GSDB25 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GSDIN8 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GSE | IMail Server Returned Mail (Ipswitch, Inc.) |
| .GSE | GeneSys Export File (Psytech International) |
| .GSF | Multi Game Memory Editor Date File (Opencoding.net) |
| .GSF | Golf Seasons File |
| .gsf | Ghostscript Fonts |
| .GSF | Gedemin Settings File (Golden Software of Belarus, Ltd) |
| .GSHR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GSI | GPS Tuner Map Slices Calibration Data (Megalith-Systems) |
| .GSI | GeneSys Remote Administration File (Psytech International) |
| .GSL | GoodSync Job List File (Siber Systems Inc.) |
| .GSLIB | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GSM | US Robotics Modem File GSM Audio over MODEM File |
| .GSM | ArchiCAD Library Object (Graphisoft R&D Software Development Rt.) |
| .GSM | Raw GSM 6.10 Audio Stream |
| .GSM | GoldSim Model File (GoldSim Technology Group) |
| .GSMA | Glove Shack Mail Archive (The Glove Shack) |
| .GSN | Cyberboard Scenario (Dale Larson) |
| .GSN | GeneSys Norm File (Psytech International) |
| .GSO | WinOrganizer or GoldenSection Notes Database (The Golden Section Labs) |
| .GSOS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GSP | IMail Server Returned Mail (Ipswitch, Inc.) |
| .GSP | GoldSim Input Model File (GoldSim Technology Group) |
| .GSP | Giza Specifier Project File (20-20 Technologies) |
| .GSP | Geometer's Sketchpad Document File (Key Curriculum Press) |
| .GSP | Grelix Software Packer Archive (Grelix Software) |
| .GSPLUS | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GSR | GeneSys Report File (Psytech International) |
| .GSR6 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GSS | Multi Game Memory Editor Memory Snapshot (Opencoding.net) |
| .GSS | Geometer's Sketchpad Script (Key Curriculum Press) |
| .GST | Gain Script Text (AIM Software) |
| .GST | Giza Specifier Template File (20-20 Technologies) |
| .GST | Multi Game Memory Editor Template File (Opencoding.net) |
| .GST | MapInfo Geoset File (MapInfo Corporation) |
| .GST | Need for Speed |
| .GSTORE | GMailStore Archive |
| .GSV | GameShark SP Gameboy Advance Game Save Info (Mad Catz, Inc.) |
| .GSV | Genecyst SRAM ROM Dump |
| .GSW | GraphShow Worksheet |
| .GSW | GRDSOZ4W Gerdsooz Source File |
| .GSX | Gens 2.0 Save State File |
| .GSX | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GSXL | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GT2 | Graoumf Tracker Music Module |
| .GTAG | Jelbert GeoTagger Database File (Jelbert Consulting) |
| .GTAR | GNU tar Compressed File Archive (GNU Tape Archive) |
| .GTD | GT Designer 2 Project (Mitsubishi Electric Corporation) |
| .GTE | GigaTrust RM-protected File (GigaMedia Access Corporation) |
| .GTF | Tom Clancey's Ghost Recon Game File (Red Storm Entertainment) |
| .GTF | PGA Golf Binary File |
| .GTH | Domino Document Manager (IBM) |
| .GTK | Graoumf Tracker Music Module |
| .GTM | GPS TrackMaker General Map File (Geo Studio Technologies Ltd.) |
| .GTO | Quicken On-line File (Intuit Inc.) |
| .GTP | Guitar Pro Tablature (Arobas Music) |
| .GTP | Atari Executable (Atari) |
| .GTP | MultiFS Video File |
| .GTS | Genome Software Tempo Alarm Clock |
| .GTT | Guntram's Tabletweaving Thingy |
| .GTV | GigaTrust RM-protected File (GigaMedia Access Corporation) |
| .GTX | Genetica Texture Pack (Spiral Graphics Inc.) |
| .GTX | GTX Group IV Raster Graphic |
| .GTY | Gibson Tray File |
| .guess | Configuration Identification Script |
| .GUI | Doom User Interface Information (Id Software, Inc.) |
| .GUI | GUI Design Studio Project File (Caretta Software Ltd.) |
| .GUI4CLI | Gui4Cli Graphical User Interface for Command User Interface (Dimitris Keletsekis) |
| .GUIDE | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GUIDE | Amigaguide Hypertext Document (Amiga, Inc.) |
| .GUIKIT | ShapeShifter Theme (Unsanity LLC) |
| .GUITAR | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GUL | JungUm Global Viewer Korean Language File (Samsung Electronics) |
| .GUL | Samsung Document (Samsung) |
| .GUN | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GUN | Tom Clancey's Ghost Recon Gun Description File (Red Storm Entertainment) |
| .GUN2 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GUP | PopMail Data |
| .GUR | Gutsch & Exner Software Update Undo |
| .GUT | ASSISTANT Data File (GUT GmbH) |
| .GUX | Gutsch & Exner Software Update |
| .GV | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GV | Graphviz DOT Language File (AT&T Research) |
| .GV | Grandview |
| .GVI | Google Video File (Google) |
| .GVP | gvSIG Project File (Conselleria d'Infraestructures i Transport) |
| .GVP | Google Video Playlist (Google) |
| .GVS | GuitarVision Song File (MTW Studios, Inc.) |
| .GW3 | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GWC | Golfwits Course Map (Siscosoft, Inc.) |
| .GWF | Benthic Golden |
| .GWI | GroupWise Link Information (Novell, Inc.) |
| .GWK | GraphiCode Printed Circuit Board Drawing |
| .GWM | Epson Creative Studio 30 Example File (Epson Corporation) |
| .GWP | Greetings WorkShop File |
| .GWP | GoodWay Flight Planner Flight Plan File (GoodWay) |
| .GWS | GeoMedia Geoworkspace File |
| .GWV | Groundwater Vistas Packaged Model File (Environmental Simulations International Ltd (ESI)) |
| .GWX | Genigraphics Graphics Link Presentation |
| .GWZ | Genigraphics Graphics Link Presentation |
| .GX | Unknown Apple II File (found on Golden Orchard Apple II CD Rom) |
| .GX1 | Show Partner Graphics File |
| .GX2 | Show Partner Graphics File |
| .GXA | General CADD Pro Attributes (General CADD Products, Inc.) |
| .GXC | General CADD Pro Component (General CADD Products, Inc.) |
| .GXD | Jeol EX Spectrometer Data File |
| .GXD | GX-Reports File |
| .GXD | General CADD Pro Drawing File (General CADD Products, Inc.) |
| .GXF | Grid Exchange Format |
| .GXF | SMPTE GXF Container |
| .GXF | General CADD Pro Font (General CADD Products, Inc.) |
| .GXL | Genus Graphics Library |
| .GXM | General CADD Pro Macro Script (General CADD Products, Inc.) |
| .GXP | Jeol EX Spectrometer Data File |
| .GXR | GX-Reports File |
| .GXR | Genexus Report Viewer |
| .GXS | GrafiXML Native Format (Universite Catholique de Louvain-la-Neuve) |
| .GXT | Grand Theft Auto II/III Text (Rockstar Games) |
| .GXW | GRASS GIS Workspace Layout Definition (Open Source Geospatial Foundation) |
| .GYM | Geoworks Generic Symbol File |
| .GYM | Sega Genesis/Mega Drive Music Logged Format (Sega of America, Inc.) |
| .GZ | Gzip Compressed Archive |
| .GZ | GIMP Image File (The GIMP Team) |
| .GZA | GZA Compressed Archive |
| .GZF | Webcopier File |
| .GZIP | GNU Zip Compressed Archive |
| .GZIP | Gzip Compressed Archive |
| .GZL | Go!Zilla File |
| .GZP | Giants: Citizen Kabuto |
| .GZX | Gazette File (Zeno Systems) |