| fxm | WinFax Document |
| fxo | WinFax Document |
| fxp | FontExpert Document |
| fxr | WinFax Document |
| fxs | WinFax Document |
| fxy | Fortron Embroidery Format Document |
| fzs | FuzzySheet Document |
| g | BRL-CAD Geometry Document |
| gabw | AbiWord Gzip Compressed Document |
| gb0 | Gerber Format Document |
| gb1 | Gerber Format Document |
| gbr | Gerber Format Document |
| gbxml | gbXML Document |
| gcd | General Content Descriptor |
| gcx | Macintosh Grapher Document |
| gdb | SmartWare Business Graph Definition File |
| gdc | Iconics GraphWorx32 Display for WinCE |
| gdc | SmartWare Composite Graph Definition File |
| gddoc | InSync Google Drive Document |
| gddraw | InSync Google Drive Draw Document |
| gde | SmartWare Elevation Graph Definition File |
| gde | The Guide Document |
| gdf | Iconics GraphWorx32 Display |
| gdform | InSync Google Drive Form Document |
| gdh | SmartWare High-Low Graph Definition File |
| gdl | ArchiCAD Geometric Description Language File |
| gdn | SmartWare Graph Definition File |
| gdnote | InSync Google Drive Note Document |
| gdoc | Google Drive Document |
| gdocx | Google Drive DOCX Document |
| gdraw | Google Drive Drawing |
| gds | GDSII Document |
| gds | SmartWare Scientific Graph Definition File |
| gds2 | GDSII Document |
| gdsheet | InSync Google Drive Sheet Document |
