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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .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 |
| .GUI | Indigo Byte Systems, LLC | Data Files | Dr.Explain Project File | Dr.Explain | Indigo Byte Systems, LLC |
| .GUIDES | Iconfactory | Data Files | xScope Guides File | xScope | Iconfactory |
| .GUT | GUT GmbH | Data Files | ASSISTANT Data File | ASSISTANT | GUT GmbH |
| .GW | Grassland, Soil and Water Research Laboratory | Data Files | SWAT Groundwater Input Data | SWAT | Grassland, Soil and Water Research Laboratory |
| .GWK | GraphiCode | Data Files | GraphiCode PCB Job File | GraphiCode GC-Prevue | GraphiCode |
| .GWL | Nanoscribe | Data Files | Nanoscribe General Writing Language File | Photonic Professional GT | Nanoscribe |
| .GWP | Microsoft Corporation | Data Files | Greetings Workshop Project File | Microsoft Greetings Workshop | Microsoft Corporation |
| .GWT | BioMedware | Data Files | SpaceStat Generalized Weights Format | SpaceStat | BioMedware |
| .GWV | Environmental Simulations, Inc. (ESI) | Data Files | Groundwater Vistas Packaged Model | Groundwater Vistas | Environmental Simulations, Inc. (ESI) |
| .GWX | Microsoft Corporation | Data Files | Genigraphics Graphics Link Presentation File | Microsoft PowerPoint | Microsoft Corporation |
| .GX2 | General CADD Products | Data Files | Generic Cadd Data | General CADD Pro | General CADD Products |
| .GXL | AT&T Labs | Data Files | Graph Exchange Language File | Graphviz | AT&T Labs |
| .GXS | Open Source | Data Files | GrafiXML Graph Data File | GrafiXML | Open Source |
| .GYU | Moonstone Cherry | Data Files | Imouto Paradise Data | Imouto Paradise | Moonstone Cherry |
| .GZF | MaximumSoft Corp | Data Files | Webcopier File | WebCopier | MaximumSoft Corp |
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