| g3m | Casio Prizm Main Memory Data |
| g3w | Geoplan-Geospace 3D Data |
| g4 | CCITT Group 4 Encoded Fax |
| g4 | Gerber Inner Routing Layer 1 Data |
| g4 | GTXRaster CAD Data |
| g42 | DLS/32 Supply Chain Planning Data |
| g5 | CAMtastic Mid Layer Gerber Data |
| g53 | DLS/32 Supply Chain Planning Data |
| g64 | Genetec Omnicast Video Archive |
| g8 | Cubicomp PictureMaker Green Channel Image Data |
| g94 | Gaussian 94 Data |
| 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 |
