| gse | GeneSys 3 Export File |
| gsf | MODFLOW Grid Specification Data |
| gsf | z-Tree GameSafe Data |
| gsf | GameExchange2 Skeleton Data |
| gsf | Gwyddion Simple Field File |
| gsf | GEMPAK Map File |
| gsk | GSAK Macro File |
| gslib | Geostatistical Software Library Data |
| gsp | Tascam Gigastudio Performance Data |
| gss | Geometer Sketchpad Script |
| gsv | Gameshark SP Save File |
| gsx | Genecyst Emulator Saved State |
| gsym | Rocket D3 Global Symbol Data |
| gt6 | Topcon Link GTS-6 Raw Data |
| gt7 | Topcon Link GTS-7 Raw Data |
| gtable | Google Drive Fusion Table |
| gtar | GNU Tar Archive |
| gtb | Midas GTS Data File |
| gtd | GT Designer 2 Data |
| gte | GigaTrust Client Protected Data |
| gtf | Gene Transfer Format File |
| gtfs | General Transit Feed Specification Data |
| gthr | Microsoft SharePoint Portal Server Gather Log |
| gti | GT STRUDL Geometry Data |
| gtl | Gerber Top Layer Data |
| gtm | GreekToMe Translation |
| gtm | CFX Mesh File |
| gto | Gerber Top Overlay Data |
| gtp | Gerber Top Paste Mask Data |
| gtr | GenePattern Gene Tree File |
| gts | Gerber Top Solder Mask Data |
| gts6 | Topcon Link GTS-6 Raw Data |
| gts7 | Topcon Link GTS-7 Raw Data |
| gtw | Gen-Trix Studio Model |
| gty | MANTECH Tray Editor Gilson Tray Data |