| Extension | File Type | Files scanned | Contributor |
| G | MicroPlanet Gravity news database | 34 | Renan (aka "Wizard") |
| G01/G02/G99 | HEC-RAS Geometry file | 22 | |
| G8 | Cubicomp PictureMaker green channel image data | 15 | |
| GAB | WinDev Controls' Styles description | 70 | |
| GADGET | Microsoft Vista Sidebar Gadget (CAB - Obsolete) | 7 | |
| GADGET | Microsoft Vista Sidebar Gadget (Zip) | 7 | |
| GAL | GenePix Array List | 12 | |
| GAM | Cyberboard Game | 5 | |
| GAM | Klik'n'Play game | 19 | |
| GAM | TADS 2 Game | 13 | |
| GAM | Tasc Chess CD II saved game | 4 | |
| GAM | The Games Factory Game (G) | 4 | |
| GAM | The Games Factory Game (P) | 4 | |
| GAM | Vectrex game | 30 | |
| GAU | MS Flight Simulator Gauge | 229 | |
| GAX | MS Age of Empires II: The Conquerors Expansion v1.0 Saved Game | 7 | |
| GBA | Game Boy Advance ROM | 10 | |
| GBC | GameBoy Color ROM File | 576 | Troy Lundin |
| GBR | Gerber printed circuit description | 27 | |
| GBR | The GIMP Brush | 35 | |
| GBS | Game Boy music | 8 | |
| GBX | Cyberboard Gamebox | 9 | |
| GBX | Game data package | 60 | |
| GBX | TrackMania track | 17 | |
| GCA | G Compression Archiver | 5 | |
| GCD | General Content Descriptor file | 9 | |
| GCD | Generic CADD 6.x drawing | 6 | |
| GCF | ArcSoft Greeting Card Creator project | 6 | |
| GCF | Graphing Calculator | 126 | |
| GCF | OptionSoft WindowsXCompressor archive | 5 | |
| GCG | GCG Sequence Chemical file | 9 | |
| GCO | Genbox Family History chart options | 2 | |
| GCS | GameShark SharkSave for GameCube | 2 | |
| GD2 | GDLib Image | 2 | |
| GDB | GVA/GVA2000 Author lecture | 14 | |
| GDB | MapSource GPS Waypoint Database | 20 | |
| GDT | Genbox Family History dictionary | 2 | |
| GED | Arts and Letters Graphics file | 4 | |
| GED | GEDCOM Family History | 32 | |
| GFA | GFA-Basic ATARI tokenized source v2.x | 2 | |
| GFA | GFA-Basic ATARI tokenized source v2.x (protected) | 4 | |
| GFA | GFA-Basic MSDOS tokenized source | 3 | |
| GFS | GGFileSPlit File Fragment | 5 | |
| GFT | GSP Family Tree | 10 | |
| GFX | Explorations RPG Game Engine resource - Bitmap | 80 | |
| GG | Google Gadget | 8 | |
| GID | GID Help index | 30 | |
| GIF | GIF Bitmap (generic) | 55 | |
| GIF | GIF animated bitmap | 6 | |
| GIF | GIF87a Bitmap | 24 | |
| GIF | GIF89a Bitmap | 135 | |
| GIG | GigaSampler Sound bank | 8 | |
| GIM | Playstation 3 icon | 4 | |
| GIR | Gens Plus! movie capture | 2 | |
| GLUE | GlueMon song/module | 9 | |
| GM/GM2/GM4 | Autologic bitmap | 12 | |
| GM6 | Game Maker 6 project | 24 | |
| GMC | Game Music Creator Music | 17 | |
| GME | DexDrive memory card save game | 35 | |
| GML | Graphlet File Format | 8 | |
| GMO/MO | GNU Gettext Machine Object file | 11 | |
| GMP | GUEmap document | 8 | |
| GMV | Cyberboard Move | 2 | |
| GMV | GMV input file | 6 | |
| GMV | Gens movie capture | 3 | |
| GNM | Generator GNM output log / music | 2 | |
| GOE | GOES Satellite bitmap | 15 | |
| GP3 | Guitar Pro v3 tablature | 12 | |
| GP4 | Guitar Pro v4 tablature | 12 | |
| GP5 | Guitar Pro v5 tablature | 4 | Mamo |
| GPD | Generic Printer Description - Unidrv minidriver | 12 | |
| GPG | GNU Privacy Guard public keyring | 8 | |
| GPI | Garmin Point of Interest | 22 | |
| GPM | Crossword Puzzle | 6 | |
| GPX | GPS eXchange Format | 11 | |
| GPX | GPS eXchange format | 34 | |
| GQ | QLFC compressed archive | 7 | |
| GRA | OpenGL object | 5 | |
| GRB | Gridded Binary image | 29 | |
| GRD | Adobe Photoshop gradient | 23 | |
| GRF | GraphEdit Filter Graph | 9 | |
| GRO | Genbox Family History report options | 5 | |
| GRO | HP-48sx Graphic Object bitmap | 36 | |
| GRP | Windows Program Manager Group | 12 | |
| GRS | GetRight Skin | 45 | |
| GRX | GetRight File List | 4 | |
| GRXML | XML Grammar | 9 | |
| GRZ | GRZip compressed archive | 5 | |
| GRZ | GRZipII compressed archive | 6 | |
| GS0 | Genecyst save state | 3 | |
| GSB | Golden Software Boundary data | 2 | |
| GSD | Graphtec vector data / drawing | 3 | |
| GSM | ArchiCAD Library Object | 17 | |
| GSM | US Robotics GSM (with header) audio | 10 | |
| GSN | Cyberboard Scenario | 4 | |
| GSP | Geometer's Sketchpad Document | 23 | |
| GSS | Geometer's Sketchpad Script | 7 | |
| GT2 | GRAOUMF TRACKER module/song | 2 | |
| GTP | Guitar Pro Tablature (v1.x) | 31 | |
| GTP | Guitar Pro Tablature (v2.x) | 3 | |
| GTX | Genetica 1.0 Texture | 212 | Alex Paven |
| GUIDE | Amigaguide hypertext document | 22 | |
| GUIKIT | Shapeshifter theme | 43 | |
| GVI | Google Video | 11 | |
| GVP | Google Video pointer | 12 | |
| GWI | Novell Groupwise File link | 19 | |
| GWP | GoodWay Flight Planner flight plan | 6 | |
| GXF | Grid Exchange Format - ASCII | 11 | |
| GXF | SMPTE GXF container | 9 | |
| GYM | Sega Genesis / Mega Drive audio/music data | 101 | |
| GZA | GZA compressed archive | 6 | |
