| 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 |
| gth | BibExcel GTH Data |
| gth | IBM Lotus Domino Document Manager Gatherer 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 |
| gtxlng | GearTrax Language Data |
| gty | MANTECH Tray Editor Gilson Tray Data |
| gui | GUI Design Studio Design |
