| gir | Gens Plus! Movie Capture |
| gix | Genigraphics Graphics Link Presentation |
| gjf | Gaussian Input Data |
| gkf | GAUSS Engine MTGRTE License |
| gko | Gerber Keep Out Layer |
| gkp | GameKeyboard Data |
| gkr | GCJ Key Storage |
| glad | GenePattern GLAD File |
| glb | Binary glTF Data |
| glf | GameExchange2 Light Data |
| glg | MicroSim PCBoard Photoplot Job |
| glh | Gallery Lock Pro Locked Video |
| glk | Gallery Lock Pro Locked Image |
| gll | EASE SpeakerLab Loudspeaker Model |
| glm | BrainVoyager QX GLM Data |
| glm | Sybase PowerDesigner Glossary Model |
| glob | Coq Globalization Data |
| glogic | gLogic Data |
| glp | NaviEdit Geoconsult Long Profile |
| gltf | GL Transmission Format Data |
| glv | ABB HTS500 Graphic Data |
| glx | Pasco DataStudio Data File |
| gly | Act! Group Layout |
| glz | Crossword Power Tools Grids Library |
| gm1 | Gerber Mechanical Layer 1 Data |
| gm2 | Gerber Mechanical Layer 1 Data |
| gm3 | Gerber Mechanical Layer 1 Data |
| gm3 | SAPS File |
| gmanifest | Google Desktop Gadget Manifest |
| gmax | Autodesk Gmax File |
| gmb | WinDS PRO Data |
| gmbck | Game Maker Background Image |
| gmbl | Vernier Logger Lite Data |
| gme | DexDrive Game Card Image |
| gmf | GameExchange2 Material Data |