| G | BRL-CAD Geometry File | CAD Files | 1 | 1 |
| G00 | Clannad Picture Image | Uncommon Files | 1 | 1 |
| G01 | HEC-RAS Geometry File |
CAD Files
| 2 | 2 |
| G09 | Atari Picture Image File | Graphic Files | 3 | 3 |
| G16 | GoldED Configuration File | Settings Files | 1 | 1 |
| G1L | Casio Model 9860 Data | Data Files | 1 | 1 |
| G1M | Casio Model 9860 BASIC Program File | Developer Files | 1 | 1 |
| G2M | GoToMeeting Recording File | Video Files | 1 | 1 |
| G3 | CCITT Group 3 Fax Image | Raster Image Files | 2 | 1 |
| G32 | Microsoft FRx General Ledger Index File |
Data Files
| 2 | 1 |
| G36 | Recomposer MIDI Sequence | Audio Files | 1 | 1 |
| G3D | GOM 3D File |
CAD Files
| 2 | 1 |
| G3F | Zetafax Fax |
Graphic Files
| 1 | 1 |
| G3L | Uncommon File Extension |
Uncommon Files
| 1 | 1 |
| G3N | Imaging Fax Image |
Graphic Files
| 1 | 1 |
| G3X | RealFlight Content File | Game Files | 1 | 1 |
| G4 | Microsoft Access Image Format |
Graphic Files
| 2 | 2 |
| G4B | Sokoban++ Level File |
Game Files
| 1 | 1 |
| G64 | Genetec Video File |
Video Files
| 1 | 1 |
| G8 | Cubicomp PictureMaker Green Channel Image Data File |
Graphic Files
| 1 | 1 |
| G8A | Unknown File Type |
Uncommon Files
| 1 | 1 |
| G9 | Gest Data File |
Data Files
| 1 | 1 |
| G94 | Gaussian 94 Output Chemical Modeller Input File |
Data Files
| 1 | 1 |
| GAB | Dencom Global Address Book Export File |
Data Files
| 2 | 2 |
| GADGET | Windows Gadget | Executable Files | 1 | 1 |
| GAI | Adobe SING Glyphlet Manager File |
Data Files
| 2 | 2 |
| GAL | GenePix Array List |
Data Files
| 11 | 2 |
| GAM | Saved Game File |
Game Files
| 8 | 1 |
| GAMDB00P | Unknown File Type |
Uncommon Files
| 1 | 1 |
| GAME | Apple Chess Saved Game |
Game Files
| 2 | 2 |
| GAP | PhotoImpact Pencil Style Data |
Settings Files
| 2 | 2 |
| GAR | Farming Simulator Game Archive File |
Game Files
| 2 | 2 |
| GAS | Atari Jaguar GPU Assembly Source |
Developer Files
| 1 | 1 |
| GAT | Genetic Algorithm Timetabler |
Data Files
| 1 | 1 |
| GAU | Flight Simulator Gauge File |
Uncommon Files
| 1 | 1 |
| GAX | Age Of Empires II Saved Game |
Game Files
| 2 | 1 |
| GB1 | Game Maker Backup File | Backup Files | 1 | 1 |
| GBA | Game Boy Advance ROM |
Game Files
| 4 | 1 |
| GBAP | GLBasic Project File |
Developer Files
| 1 | 1 |
| GBC | Game Boy Color ROM |
Game Files
| 8 | 1 |
| GBD | Great Budget Budget Definition Data |
Data Files
| 2 | 1 |
| GBF | General Bible Format | Text Files | 2 | 2 |
| GBI | gBurner Project File | Disk Image Files | 1 | 1 |
| GBK | GenBank Data |
Data Files
| 2 | 1 |
| GBL | Gerber Bottom Layer Data File |
Data Files
| 4 | 2 |
| GBP | Genie Timeline Backup Index File |
Backup Files
| 4 | 2 |
| GBR | Gerber Format File |
Data Files
| 4 | 2 |
| GBX | Nadeo Game File |
Game Files
| 6 | 4 |
| GC | GraphClick File |
Data Files
| 2 | 2 |
| GCA | GCA File Archive | Compressed Files | 1 | 1 |
| GCB | Google Chrome Backup Backup Data File |
Backup Files
| 1 | 1 |
| GCC | GNU C++ File |
Data Files
| 1 | 1 |
| GCD | Generic CADD Drawing File |
CAD Files
| 4 | 3 |
| GCF | Game Cache File |
Game Files
| 5 | 4 |
| GCI | GameCube Save File |
Game Files
| 1 | 1 |
| GCM | GameCube ROM |
Game Files
| 4 | 1 |
| GCO | Genbox Family History Chart Options File |
Settings Files
| 1 | 1 |
| GCS | GameCube SharkSave File |
Game Files
| 2 | 2 |
| GCSX | Microsoft Office SmartArt Color File |
Settings Files
| 1 | 1 |
| GCT | Ocarina Cheat Code Manager Exported Cheat |
Game Files
| 2 | 2 |
| GCV | SexVilla Game Movie |
Game Files
| 1 | 1 |
| GCX | Grapher Graph File |
Data Files
| 1 | 1 |
| GD2 | GD Library 2 Image File |
Graphic Files
| 1 | 1 |
| GD3 | GreatFamily Tree File |
Data Files
| 1 | 1 |
| GDA | Unix Manual Page Guide |
Data Files
| 1 | 1 |
| GDB | GPS Database File | Database Files | 10 | 6 |
| GDBTABLE | Geodatabase Table File |
Data Files
| 2 | 1 |
| GDC | Iconics GraphWorx32 Document |
Text Files
| 2 | 2 |
| GDD | Gerber Drill Drawing Data | 3D Image Files | 1 | 1 |
| GDF | GUESS Graph Data Format File |
Data Files
| 13 | 11 |
| GDG | GDevelop Project File |
Game Files
| 1 | 1 |
| GDI | Dreamcast Gigabyte Disc Image |
Game Files
| 1 | 1 |
| GDM | Bells, Whistles, And Sound Boards Module |
Audio Files
| 1 | 1 |
| GDP | Scrolling Game Development Kit Project |
Data Files
| 1 | 1 |
| GDR | Symbian OS Font File | Font Files | 2 | 2 |
| GDS | Graphic Data System File |
CAD Files
| 5 | 2 |
| GDT | Gretl Data File |
Data Files
| 4 | 4 |
| GDV | SmartWare Graphics Screen Driver |
Data Files
| 1 | 1 |
| GDW | Jaws Unleashed Data File |
Game Files
| 1 | 1 |
| GE | Gecho Configuration File |
Settings Files
| 1 | 1 |
| GEB | Dr. Hardware File |
Data Files
| 1 | 1 |
| GED | GEDCOM Genealogy Data File |
Data Files
| 12 | 2 |
| GEDCOM | GEDCOM Genealogy File |
Data Files
| 6 | 1 |
| GEF | Geotechnical Exchange Format File |
Data Files
| 1 | 1 |
| GEM | RubyGems Package |
Developer Files
| 4 | 3 |
| GEN | Sega Genesis ROM |
Game Files
| 8 | 4 |
| GENBANK | GenBank Data |
Data Files
| 2 | 1 |
| GEO | VRML Geography File |
3D Image Files
| 6 | 5 |
| GEOJSON | GeoJSON File | GIS Files | 5 | 1 |
| GEOM | AVS Application Visualization System File |
Uncommon Files
| 1 | 1 |
| GEPRINT | Google Earth Pro Map Settings |
Settings Files
| 1 | 1 |
| GER | German Text/html Info |
Text Files
| 1 | 1 |
| GERBER | Printed Circuit Board Photoplotter Data |
CAD Files
| 1 | 1 |
| GERMAN | Unknown Apple II Data File |
Uncommon Files
| 1 | 1 |
| GEV | GelEval Document |
Data Files
| 1 | 1 |
| GF | METAFONT Bitmap File |
Font Files
| 3 | 1 |
| GFB | GIFBlast Compressed Image File |
Raster Image Files
| 2 | 2 |
| GFC | Patton&Patton Flow Charting 4 Flowchart Drawing |
Data Files
| 1 | 1 |
| GFF | SignalMap Gene-Finding Format Data File |
Data Files
| 2 | 2 |
| GFI | GIFI File |
Data Files
| 3 | 2 |
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