| grd | Carlson 2016 Grid Surface Data |
| grd | ElmerGrid Mesh Definition File |
| grd | ENVI Grid Data |
| grd | RFM Irregular Spectral Grid |
| grd | RockWorks Grid Data |
| grd | Zemax Profile Data |
| grdb | GRAMPS Database |
| gre | GRETEP Data |
| greenshot | Greenshot Data |
| grf | Insight II Standard Graph Definition |
| grfx | GraphStudioNext XML Graph Data |
| grh | ILWIS Graphs Data |
| gri | Esko Automation Engine Imposition Data |
| gri | Petrosys Grid Data |
| grib | Gridded Binary Data |
| grib2 | Gridded Binary v2 Data |
| grid | GridMove Grid Template |
| grind | Juice Grinder Recipe Data |
| grindx | Juice Grinder Recipe Data |
| grk | Gradekeeper Class Gradebook |
| grldr | GRUB4DOS Internal Loader Data |
| grm | PLINK GCTA Text Relationship Matrix |
| gro | Esko Automation Engine Generic Output Data |
| group | Unix Filesystem Group Quota Data |
| groups | WebMoney Keeper CLASSIC Group Data |
| grov | Reason Regroove Data |
| growlregdict | Growl Registration Ticket Data |
| growlstyle | Growl Style Data |
| growlticket | Growl Notification Data |
| grp | Act! Group Data |
| grp | BPM Studio Playlist Archive |
| grp | Build Engine Group Data |
| grp | ENVI Display Group Data |
| grp | GameExchange2 Scene List |
| grp | GenePattern Gene Set Group File |
