| gch | Precompiled C Header File |
| gcl | GNU Common Lisp Source Code |
| gcna | Gcov Compiled Output |
| gcno | Gcov Metadata File |
| gcob | TRANSFER Cobol Source Code |
| gcov | GNU GCOV Logfile |
| gcr | GlowCode Profiling Results |
| gd | Godot Engine Source Code |
| gdb | Embarcadero InterBase Database File |
| gdc | Godot Engine Compiled Script |
| gdf | Altera Quartus II Graphic Design Data |
| gdt | Graph Drawing Toolkit Output |
| gek | GECK/Papyrus Script Editor Script |
| gemspec | RubyGems Gem Specification |
| genmodel | Eclipse Modeling Framework GenModel Data |
| gex | GameMaker Studio Extension |
| gf | Grammatical Framework Source |
| gfa | GFA BASIC Tokenized Source |
| gfar | Greenfoot Scenario Archive |
| gfe | Grammatical Framework Example |
| gfm | GitHub Flavored Markdown Document |
| gfo | Grammatical Framework Object |
| gfs | Grammatical Framework Script |
| gfx | The Games Factory Extension |
| ggfx | FactoryTalk View Studio Global Object Display Component File |
| ggi | GGI Data |
| ghc | Adobe RoboHelp Visual Basic Constant Map |
| git | Git Repository Data |
| gitattributes | Git Attributes |
| gitconfig | Git Options Data |
