| gdy | Novapoint Triangle Model |
| gdyn | Gimp Dynamics File |
| ge3 | Mastercam Geometry Data |
| ge6 | WinFamily 6 Genealogy Data |
| geb | Dr. Hardware Data File |
| geb | Sybase PowerDesigner Glossary Model Backup |
| gedata | Qlucore Omics Explorer Data File |
| gee | GeeonxCreator Object Data |
| gef | Geotechnical Exchange Format File |
| gen | Linguistic Tree Constructor Generic File |
| geo | Houdini Geometry Data |
| geodb | Cisco GSS GeoIP Database |
| geodb | Hibernate Spatial H2 GeoDB Database |
| geom | STAR-CD v3 Solver Ready Geometry Data |
| geom | CASTEP Geometry Data |
| gep | GeneXproTools Data |
| ges | GESS Data |
| gew | GeeonxCreator Stream Data |
| gexf | Graph Exchange XML Format |
| gff | General Feature Format File |
| gfi | Genigraphics Graphics Link Presentation |
| gfr | FusionSeq Gene Fusion Report |
| gfs | Immersioni Profile |
| gft | GSP Family Tree Data |
| gft | Torque Font Cache |
| gfv | GfsView Data |
| gfx | FactoryTalk View Display Data |
| gg | Google Desktop Gadget |
| gg1 | Gerber Drill Guide Data |
| gg2 | Gerber Drill Guide Data |
| gg3 | Gerber Drill Guide Data |
| ggc | Google Desktop Gadget Container |
| ggd | GASTAR Gridded Concentration Data |
| ggn | ABB HTS500 Saved Job |
| ggp | Global Geodynamics Project Data File |