| gcz | Dolphin Emulator Archive |
| gd | STK Database Update Information |
| gd1 | Gerber Drill Drawing Data |
| gd2 | Gerber Drill Drawing Data |
| gd3 | Gerber Drill Drawing Data |
| gd3 | GreatFamily Genealogy Data |
| gd3 | SNES ROM Image GD3 |
| gdb | Act! Group Database |
| gdb | Genbox Family History Database |
| gdb | GroupMail Database |
| gdb | TIGER Geodatabase |
| gdc | FME Desktop Grid Data Catalog |
| gdd | Gerber Drill Drawing Data |
| gde | GDE Data |
| gde | GlobalQSL Graphic Editor Data |
| gdf | 3DMove 3D Geological Model |
| gdf | FutuRUG Group Definition |
| gdf | GEOS Dictionary Data |
| gdf | GlossTeX Definition |
| gdf | SmartWare Pre 1.5 Graph Definitions Data |
| gdi | Sega Dreamcast GDI Image |
| gdiagramstyle | OmniGraffle Diagram Style |
| gdl | Stanford Microarray Database GDL Data |
| gdlink | InSync Google Drive Link Data |
| gdo | Gerber Data Object |
| gdq | SmartWare Quick Graph |
| gdr | GRAFIK Eye Designer User Data |
| gdscript | InSync Google Drive Script Data |
| gdsp | Astound GDSP Data |
| gdt | Genbox Family History Dictionary Data |
