| g99 | HEC-RAS Geometry File |
| ga | STK Great Arc Propagator File |
| ga3 | Graphical Analysis 3 Document |
| gaa | GAL-ANA Data File |
| gac | Microsoft Office Groove 2007 Data |
| gad | GeoDict Analytic Data |
| gad | Intergado Data File |
| gaf | GameExchange2 Animation |
| gai | Adobe Glyphlet Development Kit Glyphlet |
| gai | Serato DJ Data |
| gal | Altium Designer GAL Equation Data |
| gal | Corel Multimedia Manager v6 Album |
| gal | GenePix Array List |
| gal | SpaceStat Binary Contiguity Data |
| gallery | SMART Notebook Gallery |
| gallerycollection | SMART Notebook Gallery Collection |
| galleryitem | SMART Notebook Gallery Item |
| gam | Aureas Theme File |
| gam | GAMESS Input Data |
| gam | Gamma Card Data |
| gam | General Game Data |
| gam | MacMolPlt GAMESS Input Format Data |
| game | GameSalad Exported Game |
| gamin | GAMESS Input Data |
| gaml | GAML Document |
| gamout | GAMESS Output Data |
| gap | Generation Analysis and Planning Data |
| gapp | Storyboard Embedded Engine Exported Data |
| gas | Grab-a-Site Data File |
| gasx | GOM Player Data |
