| gpi | GNU Pascal Interface. |
| gr | GX Resource Source File |
| gr2 | Granny 3D Document |
| gradle | Android Studio Gradle Properties |
| grc | GX Compiled Resource File |
| grdecl | Eclipse ASCII Grid Data |
| grh | GX Resource Header File |
| grid | Eclipse Grid Data |
| grn | Granny 3D Document |
| groovy | Groovy Script |
| grp | Amazon Lumberyard Group Data |
| gs | Gofer Source Code |
| gsh | Visual Studio GL Shader Data |
| gshader | Visual Studio GL Shader Data |
| gsoap | gSOAP Settings |
| gss | GAUSS Source Code |
| gsy | Green Shoes Package |
| gt | IBM WebSphere sMash Groovy Template |
| guess | Autotools Triplet |
| gvy | Groovy Script |
| gwe | GameWeaver Executable |
| gwf | Benthic Golden Data File |
| gwsp | Axeda Builder Project |
| gxp | Google XML Pages File |
| gxr | GeneXus Report |
| gyp | Chromium GYP Language File |
| gypi | Chromium GYP Language Include |
| h | C Header File |
| h-- | Sphinx C-- Language Header File |
| h2 | H2 Database File |
| h32 | Borland C++ 32bit Include File |
| h86 | µVision Intel HEX Data |
| hac | Helma Actions Script |
| hai | NTgraph Nt09b-2b EMX Library |
| hal | HansaWorld Hansa Applications Language File |
