| gen | Linguistic Tree Constructor Generic File |
| gen | PLINK Oxford Genotype Data |
| gen | ToGenBank Data |
| genbank | GenBank Data |
| genh | eXtendable Wad Editor GENH Data |
| genome | IGV Genome Informations Data |
| geo | Houdini Geometry Data |
| geodb | Cisco GSS GeoIP Database |
| geodb | Hibernate Spatial H2 GeoDB Database |
| geom | CASTEP Geometry Data |
| geom | STAR-CD v3 Solver Ready Geometry Data |
| gep | GeneXproTools Data |
| ges | GESS Data |
| gew | GeeonxCreator Stream Data |
| gex | Geometry Explorer Data |
| gexf | Graph Exchange XML Format |
| gez | eXtendable Wad Editor GEZ Data |
| gfe | Altair FEKO Green Electric Field Strengths Data |
| gff | General Feature Format File |
| gff3 | Generic Feature Format v3 Data |
| gfh | Altair FEKO Green Magnetic Field Strengths Data |
| 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 |
| gfy | Grafical 1.0 Data |
| gg | Google Desktop Gadget |
| gg | Gridgen Data |
| gg1 | Gerber Drill Guide Data |
| gg2 | Gerber Drill Guide Data |
| gg3 | Gerber Drill Guide Data |
| ggc | Google Desktop Gadget Container |
