| fxp | Cubase FX Program |
| fxr | Oracle Documaker Font Cross-Reference Data |
| fxt | MakeMusic Finale Script |
| fxv | SPSD/M FXV Data |
| fxw | eSignal FXW Data |
| fxye | GSAS Data |
| fyi | Concordance FYI Server Data |
| fz2 | JB BAHN Zoom2 Graphics |
| fz4 | JB BAHN Zoom4 Graphics |
| fza | Form Z Autosave File |
| fza | Fattz Announcement Header |
| 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 |