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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .GAM | Nintendo | Game Files | Saved Game File | DeSmuME | Open Source |
| .GBA | Unknown Developer | Game Files | Game Boy Advance ROM | KiGB | Open Source |
| .GBC | VBA Team | Game Files | Game Boy Color ROM | BGB | Open Source |
| .GBL | Ucamco | Data Files | Gerber Bottom Layer Data File | Gerbv | Open Source |
| .GBP | Genie | Backup Files | Genie Timeline Backup Index File | Gerbv | Open Source |
| .GBX | Nadeo | Game Files | Nadeo Game File | CyberBoard | Open Source |
| .GCF | Valve | Game Files | Game Cache File | GCFScape | Open Source |
| .GDB | Garmin | Database Files | GPS Database File | Firebird | Open Source |
| .GDBTABLE | Open Source | Data Files | Geodatabase Table File | GDAL | Open Source |
| .GDI | Open Source | Game Files | Dreamcast Gigabyte Disc Image | nullDC | Open Source |
| .GDP | Open Source | Data Files | Scrolling Game Development Kit Project | The Scrolling Game Development Kit | Open Source |
| .GDT | Open Source | Data Files | Gretl Data File | gretl | Open Source |
| .GED | Thoughtful Creations | Data Files | GEDCOM Genealogy Data File | Taurus FamilyTree | Open Source |
| .GEDCOM | Open Source | Data Files | GEDCOM Genealogy File | Lifelines | Open Source |
| .GEF | Open Source | Data Files | Geotechnical Exchange Format File | GEF plot | Open Source |
| .GEN | Sega | Game Files | Sega Genesis ROM | Gens Plus! | Open Source |
| .GEOJSON | Open Source | GIS Files | GeoJSON File | GDAL | Open Source |
| .GFB | Open Source | Raster Image Files | GIFBlast Compressed Image File | GIFBlast | Open Source |
| .GFF | Roche Sequencing Solutions, Inc. | Data Files | SignalMap Gene-Finding Format Data File | Integrated Genome Browser | Open Source |
| .GFW | Open Source | GIS Files | GIF World File | AbiWord | Open Source |
| .GG | Uncommon Files | Google Desktop Gadget File | OpenEmu | Open Source | |
| .GHOST | Open Source | Plugin Files | Ghost Inactive Mode File | Wrye Bash | Open Source |
| .GIM | Sony | Raster Image Files | PlayStation Portable Image File | RCO Editor | Open Source |
| .GIR | Open Source | Video Files | Gens Plus! Movie Capture | Gens Plus! | Open Source |
| .GITMODULES | Open Source | Data Files | Git Module | Git | Open Source |
| .GLADE | Open Source | Developer Files | Glade Project File | Glade | Open Source |
| .GLF | Vladimir Romanyuk | 3D Image Files | Space Engine Shader File | AfterGRASP | Open Source |
| .GLS | Babylon Software Ltd. | Data Files | Babylon Glossary File | GLScript | Open Source |
| .GM | GameMonkey | Developer Files | GameMonkey Script | PSPad | Open Source |
| .GML | Galdos Systems, Inc. | GIS Files | Geography Markup Language File | Gerbv | Open Source |
| .GMMOD | YoYo Games | 3D Image Files | Game Maker 3D Model File | Model Creator for Game Maker | Open Source |
| .GMP | Blue Marble Geographics | Data Files | Global Mapper Package File | Geomorph | Open Source |
| .GMS | Open Source | Data Files | Gesture And Motion Signal File | libGMS | Open Source |
| .GMV | GenSoft | Game Files | Gens Game Recording | Gens | Open Source |
| .GNU | Sublime HQ Pty Ltd | Text Files | GNU Licence Information | Gnuplot | Open Source |
| .GNUMERIC | Open Source | Spreadsheet Files | Gnumeric Spreadsheet | Gnumeric | Open Source |
| .GO | Developer Files | Go Source Code File | NetBeans | Open Source | |
| .GOD | 4D, Inc | Game Files | Gore Game Data File | God | Open Source |
| .GP | Sublime HQ Pty Ltd | Developer Files | Gofer Project Source | PSPad | Open Source |
| .GP4 | Arobas Music | Uncommon Files | Guitar Pro 4 Tablature | DGuitar | Open Source |
| .GPD | Microsoft Corporation | Text Files | Generic Printer Description File | PhotoDefiner Viewer | Open Source |
| .GPF | Open Source | Game Files | Gecko Patch File | Nintendulator | Open Source |
| .GPI | Garmin | Data Files | Garmin Point Of Interest File | Gerbv | Open Source |
| .GPL | Open Source | Text Files | GNU Public License Text File | Notepad2 | Open Source |
| .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 | Avogadro | Open Source |
| .GPX | Unknown Developer | GIS Files | GPS Exchange File | JOSM | Open Source |
| .GRAMPS | Open Source | Data Files | Gramps XML Data | Gramps | Open Source |
| .GRAPHML | The GraphML Team | Data Files | GraphML File | Gephi | Open Source |
| .GRE | Open Source | Data Files | GRETEP Data | GRETEP | Open Source |
| .GRF | GRAVITY | Game Files | Ragnarok Client Archive | OpenTTD | Open Source |
| .GRO | Open Source | Audio Files | Allegro MIDI File | Audacity | Open Source |
| .GROOVY | VMware | Developer Files | Groovy Source Code File | NetBeans | Open Source |
| .GRP | Blizzard Entertainment Inc. | Game Files | StarCraft Graphics Group File | Ken Silverman's Build Engine | Open Source |
| .GS0 | Sega | Game Files | Sega Genesis Emulator Quick Slot 0 Save File | Gens/GS | Open Source |
| .GSC | Activision | Game Files | Call Of Duty Game Script | Notepad2 | Open Source |
| .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 | Gerbv | Open Source |
| .GTP | Ucamco | Data Files | Gerber Top Solder Paste Data File | Gerbv | Open Source |
| .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 | Gerbv | Open Source |
| .GTY | Open Source | Data Files | G-clamp Template File | G-clamp | Open Source |
| .GVI | Video Files | Google Video File | Eltima Elmedia Player | Open Source | |
| .GVS | Open Source | Audio Files | GuitarVision Song File | GuitarVision Player | Open Source |
| .GWB | Open Source | Page Layout Files | Interwrite Presentation File | InterWrite Reader | Open Source |
| .GXS | Open Source | Data Files | GrafiXML Graph Data File | GrafiXML | Open Source |
| .GXW | Open Source | GIS Files | GRASS GIS Workspace File | GRASS | Open Source |
| .GZ | GNU Project | Compressed Files | Gnu Zipped Archive | PeaZip | Open Source |
| .H | The Eclipse Foundation | Developer Files | C/C++/Objective-C Header File | gVim | Open Source |
| .H5 | The HDF Group | Data Files | Hierarchical Data Format 5 File | GDAL | Open Source |
| .HAC | Open Source | Developer Files | Helma Actions Script | Helma | Open Source |
| .HAL | HansaWorld | Uncommon Files | HansaWorld Enterprise HAL Code File | Dragon UnPACKer | Open Source |
| .HAML | Sublime HQ Pty Ltd | Developer Files | HTML Abstraction Markup Language File | PSPad | Open Source |
| .HAN | Amazon | eBook Files | Amazon Kindle eBook Data File | AbiWord | Open Source |
| .HBS | GitHub, Inc. | Developer Files | Handlebars Template | Adobe Edge Code C | Open Source |
| .HBX | Open Source | Encoded Files | BinHex Encoded File | UUDeview | Open Source |
| .HC | Open Source | Disk Image Files | VeraCrypt Container File | VeraCrypt | Open Source |
| .HDI | Open Source | Disk Image Files | Hard Disk Image | Anex86 | Open Source |
| .HDM | Openwave Systems Ltd | Web Files | Handheld Device Markup Language (HDML) File | Notepad2 | Open Source |
| .HDML | Openwave Systems Ltd | Web Files | Handheld Device Markup Language (HDML) File | Notepad2 | Open Source |
| .HDMOV | Apple | Video Files | QuickTime HD Movie File | Media Player Classic | Open Source |
| .HDT | Adobe Systems Incorporated | Settings Files | Photoshop HDR Toning Preset File | Helium Music Manager | Open Source |
| .HEX | Intel Corporation | Developer Files | Hexadecimal Source File | UUDeview | Open Source |
| .HFB | Open Source | Game Files | Hell Fighter Battle File | Hell Fighter | Open Source |
| .HH | Microsoft Corporation | Developer Files | C++ Header File | HammerHead Rhythm Station | Open Source |
| .HI | Interscape | Game Files | MacMAME High Scores File | MAME | Open Source |
| .HIN | Hypercube, Inc. | Data Files | HyperChem Input File | Avogadro | Open Source |
| .HND | Han Kleijn | Data Files | HNSKY Deep Sky Database File | HNSKY | Open Source |
| .HO | Open Source | Data Files | Knowledge Explorer Knowledge Representation Hierarchy Outline | my Knowledge Explorer | Open Source |
| .HOC | Open Source | Developer Files | High Order Calculator (HOC) Script File | High Order Calculator (HOC) | Open Source |
| .HRF | Hitachi Industrial Equipment Systems | Raster Image Files | Hitachi Raster Format File | Dragon UnPACKer | Open Source |
| .HRL | Ericsson Computer Science Laboratory | Developer Files | Erlang Header File | AbiWord | Open Source |
| .HS | Open Source | Developer Files | Haskell Script | gVim | Open Source |
| .HSD | Microsoft Corporation | Data Files | Hagaki Studio Document File | Highway Pursuit | Open Source |
| .HSK | Huskey Truss & Building Supply | Data Files | Huskey Truss & Building Supply Import File | Notepad2 | Open Source |
| .HTB | Open Source | Data Files | Audacity Help File | Audacity | Open Source |
| .HTF | Australian Government | GIS Files | Hydrographic Transfer Format | GDAL | Open Source |
| .HTM | Various Developers | Web Files | Hypertext Markup Language File | AbiWord | Open Source |
| .HTML | Various Developers | Web Files | Hypertext Markup Language File | AbiWord | Open Source |
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