| 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 | SAPS File |
| gm3 | Gerber Mechanical Layer 1 Data |
| gmanifest | Google Desktop Gadget Manifest |
| gmap | Garmin Map |
| 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 |
| gml | Girder Plugin |
| gmmod | Game Maker 3D Model |
| gmr | Schlafhorst Graphical Monitor Record |
| gmres | Game Maker Resource |
| gms | Gesture and Motion Signal |
| gms | GAMS Model File |
| gmspr | Game Maker Sprite |
| gmt | GenePattern Gene Matrix Transposed File |
| gmx | GenePattern Gene Matrix File |
| gna | Genigraphics Graphics Link Presentation |
| gnf | GluonPilot Navigation File |
| gni | VisiDAQ Data File |
| gno | GenoPro Genealogy Tree |
