| 21. | .gdl | Geometric Description Language data file (ArchiCAD) |
| 22. | .gdm | Bells, whistles, and sound boards module |
| 23. | .gds | IC layout database ◊ McDonnell-Douglas Things |
| 24. | .ge | Config file (GEcho) |
| 25. | .ged | Compiled config file (GoldED for DOS) ◊ Genealogical data (GEDCOM) ◊ Graphics (Graphic Environment Document) (Arts Letters) ◊ Graphics editor file (EnerGraphics) |
| 26. | .gef | Graphics Exchange Format |
| 27. | .gem | Vector graphics (Digital Research GEM metafile) (Ventura Publisher) |
| 28. | .gen | ARC/INFO UnGenerate format (ArcView) ◊ Compiled template (dBASE Application Generator) ◊ Generated text file (Ventura Publisher) |
| 29. | .geo | Compiled config file (GoldED for OS/2) ◊ Geode (GEOS executable) (Geoworks) |
| 30. | .getright | Unfinished download (GetRight) |