| .g | Corel Paradox Format |
| .g00 | Clannad Picture Image |
| .g01 | HEC-RAS Geometry Format |
| .g03 | HEC-RAS Geometry |
| .g1 | Gerber Inner Routing Layer 1 |
| .g10 | Garmin GPS Map |
| .g12 | CAMtastic Mid Layer 12 Gerber Data |
| .g13 | CAMtastic Mid Layer 13 Gerber Data |
| .g14 | CAMtastic Mid Layer 14 Gerber Data |
| .g15 | CAMtastic Mid Layer 15 Gerber Data |
| .g2 | Gerber Inner Routing Layer 2 |
| .g3 | G3 Fax Format |
| .g3a | Casio Prizm Program Format |
| .g3d | GOM ATOS 3D Scan Format |
| .g3f | Zetafax Fax |
| .g3n | Imaging Fax Image |
| .g3p | Casio Prizm Picture Image |
| .g3x | RealFlight Content Format |
| .g4 | GTX RasterCAD |
| .g41 | Commodore 1541 Disk Image |
| .g4b | Sokoban++ Level |
| .g5 | CAMtastic Mid Layer Gerber Data |
| .g64 | C64 Emulator Disk Image |
| .g721 | Raw CCITT/ITU G.721 4-bit ADPCM Sound Format |
| .g723 | Raw CCITT/ITU G.723 ADPCM Sound Format |
| .G723-3 | Raw CCITT/ITU G.723 3-bit ADPCM Sound |
| .g723-5 | Raw CCITT/ITU G.723 5-bit ADPCM Sound |
| .g726 | Raw CCITT/ITU G.726 ADPCM Sound Data Format |
| .g726-2 | G726-2 - Raw CCITT/ITU G.726 2-bit ADPCM Sound |
| .g726-3 | G726-3 - Raw CCITT/ITU G.726 3-bit ADPCM Sound Format |
| .g726-4 | G726-4 - Raw CCITT/ITU G.726 4-bit ADPCM Sound Format |
| .g726-5 | G726-5 - Raw CCITT/ITU G.726 5-bit ADPCM Sound |
| .ga3 | Graphical Analysis Document |
| .gab | Dencom Global Address Book Export |
| .gac | Groove |
| .gad | Geodict |
| .gadgeprj | Gadge It Project Format |
| .gadget | Windows Sidebar Gadget Format |
| .gaf | Total Annihilation Animated Bitmap Format |
| .gai | Adobe SING Glyphlet Manager |
| .gal | GenePix Array List Format |
| .galaxy | Blizzard Starcraft 2 Galaxy Script Format |
| .gallery | SMART Notebook Gallery Format |
| .gallerycollection | SMART Notebook Gallery Collection Format |
| .galleryitem | SMART Notebook Gallery Item Format |
| .gam | Game Format |
| .gambas | Gambas Application |
| .game | Command & Conquer Red Alert 3 Format |
| .gamedata | Sandlot Game Data Format |
| .gameproj | GameSalad Game Project Format |
| .gan | GanttProject Project Plan Format |
| .gap | PhotoImpact Pencil Style |
| .gar | GridGain Archive |
| .gas | Grab-a-Site Project |
| .gau | Microsoft Flight Simulator Gauge Format |
| .gax | Age Of Empires II Save Game |
| .gb | Nintendo Gameboy ROM Image |
| .gb1 | Game Maker Backup Format |
| .gba | Nintendo Game Boy Advance ROM Image |
| .gbap | GLBasic Project Format |
| .gbas | GLBasic Source File |
| .gbaskin | GBA4iOS Controller Skin |
| .gbc | Nintendo GameBoy Colour Emulator ROM Image Format |
| .gbck | Glary Utilities Backup |
| .gbcskin | GBA4iOS Controller Skin |
| .gbd | Great Budget Budget Definition |
| .gbf | Great Budget Fringe Definition |
| .gbh | GigaBar Scheme |
| .gbi | GBurner Disk Image Format |
| .gbk | Delphi Runimage Iblocal Examples Format |
| .gbl | Microsoft Visual Basic Global Definition |
| .gblorb | Interactive Fiction |
| .gbm | Genie Backup Manager Archive |
| .gbo | Gerber Bottom Overlay (silk Screen) |
| .gbp | Gerber Bottom Paste Mask Output Format Format |
| .gbproj | Apple GarageBand Project Format |
| .gbr | GIMP Brush Image Format |
| .gbs | Nintendo Game Boy Music Audio Data Format |
| .gbt | Adobe Photoshop Format |
| .gbx | Nadeo Games Format |
| .gbxml | Green Building XML |
| .gc | GraphClick Format |
| .gc3 | Golden Common Lisp Source Code |
| .gca | GCA Compressed Archive Format |
| .gca3 | GURPS Character Assistant |
| .gca4 | GURPS Character Assistant |
| .gca4base | GURPS Character Assistant |
| .gca4party | GURPS Character Assistant |
| .gccv | PageMaker Filter |
| .gcd | Prassi CD Disk Image Format |
| .gcda | GCC Gcov Profiling |
| .gcdp | Greeting Card Studio Project Format |
| .gcf | Steam Client Grid Cache Format |
| .gcg | GCG 8 Sequence Chemical Format |
| .gch | C++ Precompiled Header |
| .gci | Grand Theft Auto 2 Game Format |
| .gcm | GameCube Image Format |
| .gcno | GCC Gcov Profiling |
| .gco | Genbox Family History Chart Options |
| .gcode | G-code Source |
| .gcp | Spectramap Group Properties |
| .gcrd | GnomeCard VCard |
| .gcs | GameShark SharkSave For GameCube Format |
| .gcsx | Microsoft Office SmartArt Color Variation Package Format |
| .gct | Ocarina Cheat Code Manager Exported Cheat Format |
| .gcw | Microsoft Math Worksheet Format |
| .gcx | Apple Grapher Graph Format |
| .gcz | Compressed GameCube/Wii ROM |
| .gd | GD Library Picture Image |
| .gda | Unix Manual Page Guide |
| .gdb | Database Format |
| .gdbindexes | ArcGIS Geodatabase Index |
| .gdbtable | ArcGIS Geodatabase |
| .gdbtablx | ArcGIS Geodatabase |
| .gdc | Iconics GraphWorx32 |
| .gdd | Gerber Drill Drawing Data |
| .gde | GlobalQSL Graphic Editor |
| .gdf | GUESS Graph Data Format |
| .gdfmakerproject | GDF Editor Project Format |
| .gdh | SmartWare High-low Graph |
| .gdi | Generic Download Install |
| .gdiagramstyle | OmniGraffle Diagram Style Format |
| .gdl | ArchiCAD Geometric Description Language Data |
| .gdm | Bells, Whistles, And Sound Boards Module |
| .gdn | SmartWare Graph Definition |
| .gdoc | Link To Google Docs Web Application Document |
| .gdp | Scrolling Game Development Kit Project |
| .gdq | SmartWare Quick Graph |
| .gdr | Symbian OS Bitmap Font Format |
| .gdraw | Link To Google Drawings Web Application Drawing |
| .gdrive | Gizmo Virtual Drive Format |
| .gds | Graphic Data System Format |
| .gdsp | Astound |
| .gdt | Guitar & Drum Trainer Song Configuration |
| .gdv | SmartWare Graphics Screen Driver |
| .gdw | Jaws Unleashed Data Format |
| .gdx | GAMS Result |
| .gdyn | GIMP Pressure Curves Output |
| .gdz | Genbox Family History Data Initialization |
| .ge2 | Maya 4 GE2 Exporter |
| .ge3 | Mastercam Geometry |
| .ge6 | WinFamily 6 Genealogy |
| .gea | Fifa World Cup Game Data |
| .geb | Dr. Hardware |
| .ged | GEDCOM Family History Format |
| .gedata | Qlucore Omics Explorer Data Format |
| .gedcom | GEDCOM Genealogy Format |
| .gel | Molecular Dynamics Image |
| .gem | GEM Vector Picture Format |
| .gemfile | Ruby RubyGems |
| .gemspec | Ruby RubyGems Specification Format |
| .gen | Ventura Publisher Generated Text Format |
| .generictest | Microsoft Visual Studio Generic Test |
| .genmodel | Eclipse IDE Domain Gen Model |
| .geo | VRML Geography Format |
| .geojson | GeoJSON Format |
| .gep | GeneXproTools Data |
| .geprint | Google Earth Pro Map Setting |
| .ger | German Text/html Info |
| .ges | PINGO GrADS Description |
| .get | Pov-Ray For Windows 3.x |
| .getright | GetRight Unfinished Download |
| .gexf | Graph Exchange XML Graph Format |
| .gf | MetaFont Font Format |
| .gfa | GFA-BASIC Tokenized Source |
| .gfar | Greenfoot JAVA Archive |
| .gfb | GIFBlast Compressed GIF Image Format |
| .gfc | Patton&Patton Flow Charting 4 Flowchart |
| .gfd | GeForms |
| .gff | SignalMap Gene-Finding Format (GFF) Data |
| .gfie | Greenfish Icon Editor Pro Graphic |
| .gfl | GeForms |
| .gform | Link To Google Forms Web Application Form Document |
| .gfp | GreenForce-Player Audio Or Video Format |
| .gfs | Microsoft SharePoint WorkSpace Groove Remote |
| .gft | NeoPaint Font |
| .gfw | GIF World Format |
| .gfx | Genigraphics Graphics Link Presentation |
| .gg | Google Desktop Gadget Format |
| .ggb | GeoGebra Document Format |
| .ggd | GASTAR Output |
| .ggf | GPS Pathfinder Office Geoid Grid |
| .ggg | Green Globs & Graphing Equations Game Record |
| .ggi | GGI |
| .ggm | Green Globs & Graphing Equations Saved State |
| .ggp | GemCom Graphic Format |
| .ggpk | Grinding Gears Package |
| .ggr | GIMP Gradient Format |
| .ggs | Gameboy Emulator |
| .ggt | GeoGebra User-defined Tool |
| .ggz | Garena Skin |
| .ghc | Visual Basic Constant Map |
| .ghd | Geonaute Keymaze Tracklog |
| .gho | Norton Ghost Backup Image Format |
| .ghs | Norton Ghost Backup Format |
| .ght | Ghost Project |
| .ghx | Grasshopper |
| .gi | Prassi DVD Disk Image Format |
| .gi! | GigaSampler/GigaStudio Split |
| .gic | BioWare Aurora Engine Area |
| .gid | Microsoft Windows Help General Index Format |
| .gif | Graphics Interchange File Format |
| .gif2 | Netobjects Fusion Styles Lines |
| .gif89a | GIF 89a Image |
| .gifenx | Egis Encrypted GIF |
| .giff | CompuServe Bitmap Image(Graphics Interchange Format) |
| .gig | GigaSampler/GigaStudio Audio Format |
| .gih | GIMP Animated Brush |
| .gim | Sony Playstation 3 Icon Format |
| .gin | GEMS Engine Control Unit Format |
| .ginspect_prj | GOM Inspect Project Format |
| .gio | Nyquist Midi Test Format |
| .gip | Ghost Installer Package |
| .gir | Gens Plus! Movie |
| .gis | CFS Console Game Installer Settings Format |
| .git | Git Repository |
| .gitattributes | Pro Git Attribute |
| .gitignore | Git Ignore Format |
| .gitkeep | Gitkeep |
| .gjd | 7th Guest Game Archive |
| .gjf | Gaussian Input Data |
| .gkf | GAUSS Engine License |
| .gkh | Ensoniq EPS Family Disk Floppy Format |
| .gko | Gerber Keep Out Layer |
| .gkp | GameKeyboard |
| .gks | Graphical Kernel System Fle |
| .gl | Graphical System For Presentation Animation Format |
| .gl2 | HP Graphics Language Plotter |
| .gla | Sothink SWF Easy Project Format |
| .glad | GenePattern GLAD |
| .glade | Glade Project Format |
| .glb | STK Globe Format |
| .glc | IGIS Data |
| .gld | MPLAB C Compiler Linker Script Format |
| .glf | Space Engine Shader Format |
| .glif | Glyph Interchange Format |
| .glink | Link To Third-party Google Drive Web Application Document |
| .glk | Microsoft SharePoint WorkSpace Groove Shortcut |
| .gll | EASE SpeakerLab Compiled Text |
| .glm | DInsight Modeling Studio 3D CAM Model |
| .glo | Adobe RoboHelp Glossary Format |
| .global | Global Makefile |
| .glos | Microsoft Word For Mac Glossary |
| .glox | Microsoft Office SmartArt Graphic Layout Definitions Package Format |
| .glp | NaviEdit Geoconsult Long Profile |
| .gls | GLScript Format |
| .glu | Cyberglue |
| .glue | GlueMon Audio |
| .glut | OpenGL GLUT |
| .glut2 | OpenGL Glut-3.6 |
| .glut3 | OpenGL GLUT |
| .glx | DataStudio Experiment |
| .gly | Microsoft Word Glossary Format |
| .glz | Crossword Power Tools Crossword Library |
| .gm | Transport Tycoon Game Music Format |
| .gm1 | Heroes Of Might & Magic 3 Saved Game |
| .gm2 | Heroes Of Might & Magic III Saved Game |
| .gm3 | Heroes Of Might & Magic III Saved Game |
| .gm4 | Autologic Bitmap Image |
| .gm6 | Game Maker Project Format |
| .gm81 | GameMaker Data Format |
| .gmanifest | Google Desktop Gadget Control |
| .gmap | Garmin Map Format |
| .gmbck | Game Maker Background Image Format |
| .gmc | Global Mapper Catalog |
| .gmd | Game Maker Stored Game |
| .gme | Interact DexDrive Sony Playstation Memory Card Save |
| .gmf | Robot Arena Design And Destroy Graphic Format |
| .gmi | GPS Tuner Map Calibration Data |
| .gmk | Game Maker Project Format |
| .gml | Geography Markup Language |
| .gmm | Global Mobile Media |
| .gmmod | Game Maker 3D Model Format |
| .gmmp | WCS GMMP Gamut Mapping Profile |
| .gmo | GNU Gettext Machine Object Format |
| .gmp | Geomorph Tile Map |
| .gmr | Game Maker Compiled Game |
| .gmres | Game Maker Resource Format |
| .gms | LibGMS Gesture And Motion Signal Format |
| .gmspr | GameMaker Sprite Format |
| .gmt | Global Mobile Television Multimedia Format |
| .gmv | Gens Movie Capture Format |
| .gmw | Global Mapper Workspace |
| .gmx | GroupMail Message |
| .gmz | GameMaker Complete Source |
| .gnc | Great Notions Embroidery |
| .gnd | Geography Network Document |
| .gne | Flickr PHP Format |
| .gnm | GNM Output Music |
| .gno | GenoPro Genealogy Document Format |
| .gnp | GNXAS GNPeak Output Format |
| .gns | Sound Health Abacus Genesis |
| .gnt | Micro Focus COBOL Generated Code |
| .gnumakefile | GNU Make Makefile |
| .gnutar | TAR Archive Format |
| .go | Google Go Programming Language Source Code |
| .go! | Go!Zilla Unfinished Download |
| .goa | SpiceCAD |
| .gob | LucasArts Game Resource |
| .goc | GEOS GOC Source Code |
| .god | Populous 2 Saved Game Format |
| .gof | GameExchange Raw Object Definition |
| .gofin | Druki Gofin Document |
| .gog | Drumagog Sample |
| .gold | Gnome Desktop |
| .gom | GOpenMol Model Format |
| .goomod | World Of Goo Add-on |
| .gor | Myth: The Fallen Lords Game Data |
| .gorm | Gorm Interface Resource Format |
| .gox | The Games Factory Extension |
| .gp | Guitar Pro |
| .gp1 | Street Atlas GPS Log |
| .gp2 | Gerber Inner Plane 2 (negative) |
| .gp3 | Guitar Pro 3 Project Format |
| .gp4 | Guitar Pro 4 Project Format |
| .gp5 | Guitar Pro 5 Project File Format |
| .gpb | Gerber Bottom Pad Master |
| .gpbank | Guitar Pro Audio Bank Format |
| .gpc | Genie Backup Manager Plugin |
| .gpd | Microsoft Windows Universal Printer Unidrv Minidriver Format |
| .gpe | GP2X Video Game Executable Format |
| .gpf | Ragnarok Online Gravity Re-packed Format |
| .gpg | GNU Privacy Guard Public Keyring Format |
| .gph | Lotus 1-2-3 Graph |
| .gpi | Garmin Point Of Interest Format |
| .gpj | GINT Project Format |
| .gpk | GEOS Compressed Omnigo Format Archive |
| .gpl | GNU Public Licence Text |
| .gpm | Ragnarok Online Update |
| .gpn | GlidePlan Map Document Format |
| .gpp | Serif GraphicsPlus Object Format |
| .gpr | GenePix Results Format |
| .gprj | Gearotic Motion Project |
| .gprx | Geoxa Project Format |
| .gps | GOM Player Skin Format |
| .gpt | Gerber Top Pad Master |
| .gpu | GP2X Utility Program Format |
| .gpw | Autodesk AutoCAD Civil 3D Hydraflow Hydrographs Extension |
| .gpx | Guitar Pro 6 Format |
| .gpz | IBM DB2 Document Manager Document History |
| .gqf | GrafEq Data |
| .gqs | GrafEq Data |
| .gqsx | Microsoft Office SmartArt Style Definitions Package Format |
| .gr2 | Granny 3D Format |
| .gr4 | Pathloss Sharing |
| .gra | Microsoft Graph Chart Format |
| .grade | GradeStat Document Format |
| .grads | PINGO GrADS Data |
| .graffle | OmniGraffle Drawing Format |
| .graphml | Graph Markup Language Format |
| .graphmlz | Compressed GraphML Source Format |
| .grasp | Graphical System For Presentation Animation Format |
| .gray | RAW Gray Samples Bitmap Image |
| .grb | GRIB Meteorological Data Format |
| .grbdropfile | GetRight |
| .grc | Affymetrix Grid Control |
| .grd | Adobe Photoshop Image Ready Gradient Format |
| .grdecl | Eclipse Specific |
| .greenfoot | Greenfoot Project |
| .grey | Raw Image Format |
| .grf | DPlot Graph Format |
| .grg | GreatFamily Graphic Gallery |
| .gri | Petrosys Grid |
| .grib | WMO CBS FM 92-VIII Ext. Gridded Binary Format |
| .grid | GridMove Grid Settings |
| .grk | Gradekeeper Document |
| .grl | Microsoft Windows Update Status Format |
| .grle | Farming Simulator Save Game |
| .grm | NovaLogic Game Facial Expressions |
| .grn | Granny 3D Format |
| .gro | HP-48/49 Grob Graphic Image Format |
| .grob | Graphic Object Bitmap Format |
| .groove | Sony ACID Groove Format |
| .groovy | Groovy Programming Language Script Format |
| .group | Windows Mail Group Format |
| .groupproj | Delphi Project Group Format |
| .groups | WM Keeper CLASSIC Group |
| .growlregdict | Growl Temp Format |
| .growlstyle | Growl WebKit Style |
| .growlticket | Growl Notification Format |
| .growlview | Growl Display Plugin |
| .grp | Microsoft Windows Program Group Format |
| .grr | Gradekeeper Class Roster Format |
| .grs | GetRight Skin |
| .grt | Grapher Template |
| .gru | Geist Preset |
| .grv | Microsoft SharePoint WorkSpace Groove Format |
| .grw | SeeYou Waypoint |
| .grx | GetRight File List |
| .grxml | Grammar |
| .gry | Raw Image (Raw GREY) |
| .gs | Haskell Gofer Script Format |
| .gs0 | Sega Genesis (Megadrive) Emulator Quick Slot 0 Save Format |
| .gs1 | Genecyst Save State 1 |
| .gs3 | Genecyst Game Save State 1 Format |
| .gs4 | Genecyst Saved State Slot 4 |
| .gsa | Microsoft SharePoint WorkSpace Groove Working Space Archive Or Template |
| .gsb | Golden Software Boundary Data Format |
| .gsba | GameSave Manager Save Backup |
| .gsc | Call Of Duty Script Format |
| .gscript | Link To Google Scripts Web Application Script |
| .gscx | Microsoft Office Diagram |
| .gsd | Generic Station Description Format |
| .gsdu | GameSave Manager Database Update |
| .gse | GeneSys Export |
| .gsf | Ghostscript Fonts |
| .gsflib | Game Boy Advance Song Library |
| .gsheet | Link To Google Sheets Web Application Spreadsheet Document |
| .gsi | Golden Software Interchange Format |
| .gsl | GoodSync Job List |
| .gslides | Link To Google Slides Web Application Presentation |
| .gsm | GSM Sound Format |
| .gsp | IMail Server Returned Mail |
| .gsproj | GameSalad Project Format |
| .gsr | Golden Software GIS Format |
| .gsr2 | Golden Software GIS Format |
| .gss | Multi Game Memory Editor Memory Snapshot |
| .gst | MapInfo Geoset Format |
| .gstencil | OmniGraffle Stencil |
| .gsvr | Ghostscript |
| .gsx | Gens Sega Emulator Save State Format |
| .gsym | ArchiCAD For MAC Geometric Description Language |
| .gsz | GeoStudio Project |
| .gszip | GameSalad Market Asset Format |
| .gt | Gold Thread Embroidery Format |
| .gt2 | Graoumf Tracker Music Module (MOD) |
| .gta | Microsoft SharePoint WorkSpace Groove Tool Archive Format |
| .gtable | Link To Google Fusion Tables Web Application Table |
| .gtar | GNU Tar Compressed Archive Format |
| .gtc | Graitec Exchange Format |
| .gte | GigaTrust Protected |
| .gtemplate | OmniGraffle Template |
| .gth | Bibexcel |
| .gthr | Gather Log Format |
| .gti | STRUDL Input |
| .gtkrc | GTK+ Skin Format |
| .gtl | Gerber Top Layer |
| .gtm | GreekToMe Data Format |
| .gto | Quicken Online Data |
| .gtp | Guitar Pro Project |
| .gts | CaptiveWorks PVR Video Recording Format |
| .gtx | Genetica Seamless Texture Format |
| .gui | Dr.Explain Project Format |
| .guide | AmigaGuide Hypertext |
| .guides | The Iconfactory XScope Guides Format |
| .gul | JungUm Global Viewer Korean Language |
| .gus | Universal Score Poster Script |
| .gv | Graphviz DOT Language Format |
| .gvg | Kompass Map |
| .gvi | Google Video Format |
| .gvimrc | GVim Settings Format |
| .gvm | Phantasy Star Online |
| .gvn | GeoVisu Navigation Data |
| .gvp | Google Video Player Google Video Pointer Playlist Format |
| .gvr | GeoVisu Routes |
| .gvt | GeoVisu Tracklogs |
| .gvw | GeoVisu Waypoints |
| .gvy | Groovy Script Format |
| .gw | SWAT Groundwater Input |
| .gwb | GenStat Book |
| .gwf | Benthic Golden |
| .gwi | GroupWise Link Information Format |
| .gwk | GC-Prevue GraphiCode PCB Job Format |
| .gwl | Nanoscribe General Writing Language |
| .gwp | Greetings WorkShop Format |
| .gws | GeoMedia Geoworkspace Format |
| .gwt | SpaceStat Generalized Weights Format |
| .gwv | Groundwater Vistas Packaged Model |
| .gx2 | Generic Cadd |
| .gxa | General CADD Attribute Data |
| .gxc | General CADD Pro Component Data Format |
| .gxd | General CADD Pro Drawing Format |
| .gxf | General CADD Pro Font Data Format |
| .gxh | General CADD Pro Hatch Pattern Format |
| .gxk | Galaxkey File Manager Encrypted Format |
| .gxl | Graph Exchange Language Format |
| .gxm | General CADD Pro Format |
| .gxr | GeneXus Report |
| .gxt | Grand Theft Auto 2 Game Format |
| .gxw | GRASS GIS Workspace Layout Definition |
| .gym | Sega Genesis/Mega Drive Music Logged |
| .gyp | Google Chromium GYP Input Configuration |
| .gypi | Chrome/Chromium Include |
| .gz | GZIP Compressed Archive Format |
| .gz1 | Orgadata LogiKal |
| .gz2 | Misnamed BZ2 Format |
| .gza | Bzip2 Compressed File Archive |
| .gzf | Webcopier |
| .gzi | GZip Compressed Archive |
| .gzip | GNU ZIP Gzip Compressed Archive Format |
| .gzl | Go!Zillalist |
| .gzp | Giants Citizen Kabuto Game |
| .gzquar | BitDefender Quarantine |
| .gzr | GunZ |
File extensions are not normally displayed to users. To change this, go to Control Panel, select Appearance and Personalization and Folder Options. Next, select the View and find the option "Hide extensions for known file types". The option should be deselected (cleared) and confirmed with OK.
