| ghw | GHDL Waveform Data |
| gid | FRAMES Global Input Data File |
| gif2 | NetObjects Fusion Styles Lines Data |
| gifenx | Egis Encrypted GIF Data |
| gift | Moodle GIFT Format Data |
| gifx | Egis Encrypted GIF Data |
| gii | GIfTI Data |
| gil | GILS Data |
| gim | Genigraphics Graphics Link Presentation |
| gim | Microsoft Office Groove 2007 Identity Message |
| gim | Sony PlayStation 3 Game Icon |
| gin | Affymetrix Gene Information Library |
| gin | GEMS Engine Control Unit Data |
| ginspect | GOM Inspect Data |
| gir | Gens Plus! Movie Capture |
| gix | Genigraphics Graphics Link Presentation |
| gizmo | Gizmo Central Data |
| gjd | GeoJet Professional Database |
| gjf | Gaussian Input Data |
| gk | AutoGK Script |
| gka | Panasonic GKWIN Data |
| gkb | GeneralKB Database |
| gkf | GAUSS Engine MTGRTE License |
| gko | Gerber Keep Out Layer |
| gkon | GraphicConverter Data |
| gkp | GameKeyboard Data |
| gkr | GCJ Key Storage |
| glad | GenePattern GLAD File |
| gladinetsp | Gladinet Configuration |
| glb | Binary glTF Data |
| glb | gINT Library |
| glb | STK Globe Data |
| gle | GLE Data |
| glf | GameExchange2 Light Data |
| glf | iGolf Golf Course Data |
