| fzb | Form Z Backup File |
| fzb | Fritzing Binary |
| fzbz | Fritzing Bundled Binary |
| fzh | Form Z Help Index |
| fzm | Fritzing Module |
| fzn | FlatZinc Modelling Language Data |
| fzp | Fritzing Custom Part |
| fzpz | Fritzing Bundled Part |
| fzy | LexisNexis Concordance Fuzzy Data |
| g-code | G-code Code |
| g01 | HEC-RAS Geometry File |
| g02 | HEC-RAS Geometry File |
| g03 | HEC-RAS Geometry File |
| g04 | HEC-RAS Geometry File |
| g05 | HEC-RAS Geometry File |
| g06 | HEC-RAS Geometry File |
| g07 | HEC-RAS Geometry File |
| g08 | HEC-RAS Geometry File |
| g09 | HEC-RAS Geometry File |
| g1 | Gerber Inner Routing Layer 1 Data |
| g10 | HEC-RAS Geometry File |
| g1a | Casio fx-9860G Add-in |
| g1e | Casio Prizm eActivity File |
| g1k | Casio Prizm Manager PLUS Key Log |
| g1l | Casio fx-9860G Data |
| g1m | Casio Prizm Main Memory Data |
| g1r | Casio Prizm Main Memory Data |
| g1s | Casio fx-9860G Flash System Image |
| g2 | Gerber Inner Routing Layer 1 Data |
| g2a | GoToAssist Recording Data |
| g2e | Casio Prizm eActivity File |
| g2l | GOT2000 Log |
| g2m | Casio Prizm Main Memory Data |
| g2n | FontForge Glyph to Name Map |
| g2p | CMU Sphinx G2P Model |