| gpd | Xbox360 Game Play Data |
| gpg | GnuPG Signature/Key |
| gpi | Garmin Point of Interest Data |
| gpk | Steinberg WaveLab Audio Peak |
| gpkg | GRAMPS Data Package |
| gpl | Gimp Palette Data |
| gpl | GenePix Lab Book |
| gpm | Linger Lingrapher Graph Parameter File |
| gpp | Guitar Practiced Perfectly 2 Data |
| gpr | GenePix Results File |
| gpro | Genealogy Pro Data |
| gps | GOM Player Skin |
| gpt | Gerber Pad Master Top Data |
| gpw | Graph Paper World File |
| gpx | GPS Exchange Format Data |
| gqa | BI/Query Admin Data Model |
| gqf | GrafEq Data |
| gqfl | GrafEq Data |
| gql | BI/Query Data Model |
| gqs | GrafEq Data |
| gqsk | GrafEq Data |
| gqu | BI/Query User Data Model |
| gr | PDFgetX3 GR File |
| gr7 | Simatic S7 Graph Data |
| gramps | GRAMPS XML Data |
| graph | Mascopt Graph Data |
| grc | Affymetrix Grid Control File |
| grd | RFM Irregular Spectral Grid |
| grd | ElmerGrid Mesh Definition File |
| gre | GRETEP Data |
| grfx | GraphStudioNext XML Graph Data |
| grh | ILWIS Graphs Data |
| gri | Petrosys Grid Data |
| grib | Gridded Binary Data |
| grid | GridMove Grid Template |
