| fw3 | Framework III File |
| fwdn | fWriter Document |
| fwk | Colton Fireworkz Document |
| fwrt | FullWrite Document |
| fwtb | Freeway Template Bundle |
| fwtemplate | Freeway Template |
| fwtemplateb | Freeway Template Bundle |
| fx | Corel WordPerfect Office Template |
| fx2 | Corel WordPerfect Office Template |
| fxd | FX Draw Document |
| fxd | WinFax Document |
| fxg | FX Graph Document |
| fxi | WinFax Document |
| 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 |
| gbf | General Bible Format File |
| 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 |
| gdsii | GDSII Stream Data |
| gdslides | InSync Google Drive Slides Document |
| gdt | SmartWare Text Graph Definition File |
| ged | GEDCOM Document |
| gedcom | GEDCOM Document |
| gem | Corel Ventura Publisher Document |
| gen | Generations Embroidery Software Design |
| gen | GenStat Command File |
| geo | Carbon Graphics Geo Data File |
| gerber | Gerber Format Document |
| gev | GelEval for Mac Document |
| gevl | GelEval for Mac Document |
| gfc | Patton & Patton Flow Charting 4 Document |
| gfd | GeForms Form Document |
| gfd | GNUe Form Definitions |
| gform | Google Drive Form |
| gft | GeForms Form Template |
| ggb | GeoGebra Document |
| gge | Green Globs and Graphing Equations Saved Equation |
| ggg | Green Globs and Graphing Equations Document |
| ggt | GeoGebra Tool |
| ggx | Green Globs and Graphing Equations GGG Records List |
| gh | Grasshopper 3D Document |
| ghx | Grasshopper 3D XML Document |
| gib | Graph-in-the-Box Chart |
| gid | Windows Global Index File |
| giw | Graph-in-the-Box for Windows Presentation |
| gjam | Google Jamboard Document |
| glf | Grantleigh Labels Label Document |
| glk | GenStat ODBC Export Link |
| gly | Microsoft Word Glossary Data |
| gml | Geography Markup Language Document |
| gmp | GEM Desktop Publisher Document |
| gne | Flickr Web Page |
| gnh | GravoStyle Design Document |
| gnm | Gnumeric Spreadsheet |
| gnu | Gnuplot Input File |
| gnumeric | Gnumeric Spreadsheet |
| gofin | Druki Gofin Form Document |
| gom | gOpenMol Model |
| goodnotes | GoodNotes Document |
| gp | Guitar Pro 7 Tabulature |
| gp3 | Guitar Pro Tabulature |
| gp4 | Guitar Pro Tabulature |
| gp5 | Guitar Pro Tabulature |
| gp6 | Guitar Pro 6 Tabulature |
| gpl | Gnuplot Input File |
| gplt | Gnuplot Input File |
| gpp | Serif Graphics Plus Document |
| gpx | Guitar Pro 6 Tabulature |
| gq | Epson Page Description Language Document |
