File extensions start with character 'G'
| File Type | Category | File Format | |
|---|---|---|---|
| .gadget | Program Execution Files | Windows Gadget | |
| .gal | Data Files | GenePix Array List File | |
| .gallery | Data Files | SMART Notebook Gallery File | |
| .galleryco | Data Files | SMART Notebook Gallery Collection File | |
| .galleryit | Data Files | SMART Notebook Gallery Item File | |
| .gam | Game Files | Saved Game File | |
| .gan | Data Files | GanttProject Project File | |
| .gar | Development Files | GridGain Archive | |
| .gau | Multiple Use Files | Flight Simulator Gauge File | |
| .gb | Game Files | Game Boy ROM File | |
| .gba | Game Files | Game Boy Advance ROM | |
| .gbc | Game Files | Game Boy Color ROM | |
| .gbr | Data Files | Gerber File | |
| .gbx | CAD Files | Gerber PCB File | |
| .gc | Game Files | Galactic Conquest Saved Game | |
| .gca | Compressed Files | GCA File Archive | |
| .gcf | Game Files | Game Cache File | |
| .gct | Game Files | Ocarina Cheat Code Manager File | |
| .gcw | Data Files | Microsoft Mathematics Worksheet | |
| .gcx | Data Files | Grapher Graph File | |
| .gcz | Archive Files | Compressed GameCube/Wii ROM | |
| .gdoc | Google Files | Google Drive Document | |
| .ged | Data Files | GEDCOM Genealogy Data File | |
| .gedcom | Data Files | GEDCOM Genealogy File | |
| .gen | Configuration Files | Sega Genesis ROM | |
| .gen | Data Files | ArcView ARC/INFO UnGenerate file | |
| .gexf | Data Files | Graph Exchange XML Format File | |
| .gfp | Digital Video Files | GreenForce-Player Protected Media File | |
| .ggb | Data Files | GeoGebra Document | |
| .gho | Backup Files | Norton Ghost Backup File | |
| .gi | Disk Image Files | Global Image | |
| .gif | Raster Graphics Files | Graphical Interchange Format File | |
| .gio | Audio Files | Adagio Score | |
| .gis | Data Files | CFS Console Game Installer Settings File | |
| .gitignore | Development Files | Git Ignore File | |
| .gld | Development Files | MPLAB C Compiler Linker Script File | |
| .gls | Data Files | Babylon Glossary File | |
| .gm81 | Development Files | Game Maker 8.1 Project File | |
| .gmap | Configuration Files | Garmin Map File | |
| .gms | Data Files | Gesture and Motion Signal File | |
| .gmspr | Raster Graphics Files | Game Maker Sprite File | |
| .gno | Data Files | GenoPro Genealogy Tree File | |
| .gnp | Data Files | GNPeak Output File | |
| .gp3 | Project Files | Guitar Pro 3 File | |
| .gp5 | Adobe Files | Guitar Pro 5 Tablature File | |
| .gpd | Raster Graphics Files | Graphic PhotoDefiner Image File | |
| .gpf | eBook Files | GRAVITY Ragnarok Online Patch File | |
| .gpi | Data Files | Garmin Point of Interest File | |
| .gpj | Data Files | Grapher Project File | |
| .gpk | Compressed Files | WaveLab Audio Peak File | |
| .gpn | Text Files | GlidePlan Map Document | |
| .gpr | Data Files | GenePix Results File | |
| .gpx | eBook Files | GPS Exchange File | |
| .gra | Data Files | Microsoft Graph File | |
| .grade | Data Files | GradeStat Document | |
| .graphml | Data Files | GraphML File | |
| .graphmlz | Data Files | Zip Compressed GraphML File | |
| .grd | Configuration Files | Photoshop Gradient File | |
| .grf | Drawing Files | DPlot Graph File | |
| .grib | Data Files | Gridded Binary File | |
| .grk | Data Files | Gradekeeper Class Gradebook File | |
| .gro | Raster Graphics Files | Graphic Object Bitmap | |
| .grp | Game Files | StarCraft Graphics Group File | |
| .grr | Data Files | Gradekeeper Class Roster File | |
| .grt | Data Files | Grapher Template | |
| .grv | Data Files | Office Groove File | |
| .gs | Development Files | Google Apps Script | |
| .gsd | Text Files | General Station Description File | |
| .gsheet | Spreadsheet Files | Google Drive Spreadsheet | |
| .gslides | Google Files | Google Drive Presentation | |
| .gsp | Project Files | IMail Error Message File | |
| .gstencil | Vector Graphics Files | OmniGraffle Stencil | |
| .gtar | Data Files | GNU Tar Archive | |
| .gthr | Text Files | Gather Log File | |
| .gtp | Data Files | Guitar Pro File | |
| .gui | Data Files | Dr.Explain Project File | |
| .gv | Language Defnition Files | Graphviz DOT File | |
| .gwk | Data Files | GraphiCode PCB Job File | |
| .gxl | Data Files | Graph Exchange Language File | |
| .gz | Compressed Files | Gnu Zipped Archive | |
| .gza | Compressed Files | IZArc BGA Archive File | |
| .gzi | Compressed Files | Unix Gzip File | |
| .gzip | Compressed Files | Gnu Zipped File |