| fal | Falcon Script |
| fam | Falcon Compiled Module |
| fb | Gforth Blocks File |
| fbap | FinalBuilder Action Package |
| fbl5 | FinalBuilder Project Log |
| fblz | FinalBuilder Compressed Project Log |
| fbp | wxFormBuilder Project |
| fbpinf | FinalBuilder Project Info |
| fbv | FinalBuilder Persistent Variables File |
| fcb | FAAST Builder File |
| fce | ForeUI Custom Element |
| fcl | ForeUI Custom Library |
| fclr | Flowgorithm Color Scheme Data |
| fcs | CC5X C Compiler Function Call Structure |
| fct | Visual FoxPro Catalog Memo |
| fd | Fortran Declaration File |
| fda | FlashDevelop Argument File |
| fdb | FlashDevelop Binary File |
| fdb | Visual FoxPro Database |
| fdl | FlashDevelop Layout File |
| fdm | FlashDevelop Macro |
| fdml | Filemaker Dynamic Markup Language Document |
| fdt | FlashDevelop Template |
| fdz | FlashDevelop Zip File |
| fe | Ferite Source Code |
| feature | SharePoint Feature Data |
| feature | TestComplete Project Features Data |
| fec | Ferite C Source Code |
| feedback | Blend for Visual Studio Feedback |
| fei | Geoworks Fatal Error Infotable |
| fev | FMOD Audio Events |
| fex | WebFOCUS Procedure File |
| ff | ARRIS SigmaC Source Code |
| ffe | Microsoft DirectInput Force Feedback Effect |
| fgb | Valve Source FGB Data |
| fgd | Valve Hammer Forge Game Data |
| fgl | FGL Source Code |
| fhm | ASIP Meister Data |
| fhs | Adobe Flash FlashHelp Skin Data |
| fhz | Adobe Flash FlashHelp Compressed Skin Data |
| fi | Fortran Interface File |
| fi | Gforth Image File |
| fic | WinDev HyperFileSQL Database |
| fig | Lahey Fortran Linker Options Data |
| fig | MATLAB Figure |
| fil | dBase Application Generator File List |
| fil | ProWorx NXT Format Export |
| filmao | Aleph One Film Data |
| filters | Visual C++ Project Filters |
| fimpp | FiM++ Source Code |
| fk | Flick App |
| fky | Microsoft Visual FoxPro Macro File |
| fla | Shockwave Flash Source File |
| flb | VersaPro Folder Backup |
| flbx | EasyBuilder Pro Picture Library |
| fld | VersaPro Folder Contents Data |
| fll | Visual FoxPro DLL |
| flm | Flasm Disassembled SWF |
| flm | Visual FoxPro Library |
| flr | Flare Decompiled ActionScript File |
| flw | Visustin FlowChart |
| flw | Xilinx XFLOW Flow Data |
| fly | Fly Script |
| fmb | Oracle Forms Form Module Binary |
| fmdl | Konami Fox Engine Model |
| fmg | Harbour MiniGUI IDE Form |
| fmo | dBASE IV Compiled Object |
| fmt | IAR System Formatting Data |
| fmt | Oracle Forms Form Module Text |
| fmt | Uniface Format Data |
| fmt | Visual FoxPro Format Data |
| fmx | Delphi Form Data |
| fmx | Oracle Forms Form Module Executable |
| fn | GCL Cross Referencing Data |
| fon | Hitachi Ladder Editor Force File |
| footer | WebSTAR Directory Indexer Footer |
| form | Gambas V2 Form |
| fox | FoxBase Compiled Executable |
| fox | Visual FoxPro Executable |
| fp | OpenGL Fragment Program |
| fp | Visual FoxPro Configuration Data |
| fp2 | Crestron SIMPL Symbol Mapping Data |
| fp3 | FastReport v3 Prepared Report |
| fpa | Front Panel Express Order Data |
| fpc | FreePascal Compiler Makefile |
| fpd | Front Panel Express Design |
| fpgt | Flowgorithm Program Template |
| fpm | Visual FoxPro Startup Data |
| fpp | Fortran Source Code |
| fpp | Front Panel Designer Project |
| fpq | Microsoft Visual FoxPro Updatable Query File |
| fprg | Flowgorithm Program |
| fps | FPS Creator Segment |
| fpt | FileMaker Pro Database Memo |
| fpt | Visual FoxPro Memo |
| fpx | FastReport .NET Prepared Report |
| fpx | Visual FoxPro Compiled Program |
| fr3 | FastReport v3 Form |
| framework | Xcode Applicatiuon Framework Data |
| frf | FreeReport Form |
| frg | DBase IV Uncompiled Report |
| frm | Uniface Form Data |
| frm | Visual Basic Form |
| frpg | Flowgorithm Internal XML Data |
| frt | Visual FoxPro Report Memo |
| frx | Visual FoxPro Report |
| fs | F# Implementation |
| fs | Forth Source Code |
| fs | Gforth Forth Stream Source Code |
| fsb | Form Z Compiled Script |
| fscr | ChromeEd Forester Data Script |
| fsh | OpenGL Fragment Shader |
| fsi | F# Signature File |
| fsl | Form Z Script |
| fsq | CryENGINE Facial Editor Sequence |
| fst | CA-dBFast Linkable Program |
| fsx | F# Script |
| ftd | Falcon Template Document |
| ftl | FreeMarker Template |
| ftlh | FreeMarker HTML Template |
| ftlx | FreeMarker XML Template |
| ftr | Falcon Translation |
| ftt | Falcon Translation Template |
| ftx | WinDev HyperFileSQL Full-text Index |
| full | Cygwin Variable Log |
| func | FN Project Function Metadata |
| fw4 | Framework IV File |
| fweb | FWEB Initialization Data |
| fwx | FoxWeb Script |
| fx | Microsoft DirectX D3D Effect |
| fxa | FaceFX Actor File |
| fxd | FoxPro FoxDoc Support Data |
| fxh | MetaTrader 4 Backup Data |
| fxh | XNA Game Studio HLSL Header File |
| fxl | CryENGINE Facial Expression Library |
| fxl | FaceFX Language File |
| fxml | JavaFX Interface Description |
| fxo | Microsoft DirectX Pre-compiled Shader |
| fxp | Visual FoxPro Compiled Program |
| fxpl | Adobe Flash FXP Library |
| gab | WinDev Skin Template |
| gambas | Gambas V2 Application |
| gar | GridGain Archive |
| gas | Atari Jaguar GPU Assembly Source |
| gb | Basic4GL Source Code |
| gb1 | Game Maker Backup File |
| gbas | GLBasic Source Code |
| gbf | BASIS GUIBuilder Control Data |
| gbk | Delphi Runimage iblocal Examples Data |
| gbk | Embarcadero InterBase Database Backup |
| gbl | Visual Basic Global Declaration |
| gbs | Generic Build Support Metadata File |
| gc1 | Golden Common Lisp 1.1 Source Code |
| gc3 | Golden Common Lisp 3 Source Code |
| gcc | GCC Related Data |
| gcda | Gcov Data File |
| gcg | GAUSS Compiled Program |
| 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 |
| gdshader | Godot Engine Shader Data |
| gdt | Graph Drawing Toolkit Output |
| gek | GECK/Papyrus Script Editor Script |
| gemspec | RubyGems Gem Specification |
| gen | dBase Application Generator Compiled Template |
| generictest | Microsoft Visual Studio Generic Test Data |
| 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 |
| gitext | Git Extension |
| gitignore | Git Ignore File |
| gitkeep | Git Keep File |
| gitmodules | Git Submodule Properties Data |
| gld | 3DFX Glide Data |
| gld | MPLAB C Compiler Linker Script |
| glnk | TRANSFER Linkage Definitions |
| glo | Adobe RoboHelp Glossary Data |
| global | Global Makefile |
| gls | GLScript Game Script |
| glsl | OpenGL Shading Language File |
| glslesf | OpenGL ES Shader Fragment Data |
| glslesv | OpenGL ES Shader Variation Data |
| gluaw | Programmer's Notepad Text |
| glut | OpenGL GLUT Library Data |
| gly | Uniface Glyph Data |
| glyph | Uniface Glyph Object |
| gm | GameMonkey Script |
| gm6 | Game Maker 6.x Data |
| gm8 | Game Maker 8 Data |
| gm81 | Game Maker 8.1 Data |
| gmd | Game Maker 4.x Data |
| gmdb | GMap.NET Database |
| gmez | GameMaker Studio Extension |
| gmf | Game Maker 3.x Data |
| gmk | Game Maker 7.x Data |
| gml | GameMaker Studio GML Script |
| gmr | Game Maker Compiled Game |
| gmx | GameMaker: Studio Data |
| gmz | GameMaker: Studio Complete Source |
| gnl | GNT Analyzer Result Data |
| gnt | Micro Focus COBOL Generated Code |
| go | Go Source Code |
| gobj | Geoworks Object |
| goc | GEOS GOC Source Code |
| goconvey | GoConvey Profile Data |
| goh | GEOS GOC Header |
| gorm | Gorm Interface Resource |
| gox | The Games Factory Extension Object |
| gpc | Genie Backup Manager Plugin |
| gpdsc | KEIL µVision Generator Pack Description |
| gph | Stata Graph File |
| gpi | GNU Pascal Interface |
| gpx | BASIS GPX Data |
| gr | GX Resource Source File |
| gr2 | Granny 3D Document |
| gra | OpenGL Object Graphic |
| gradle | Android Studio Gradle Properties |
| grafsao | Aleph One Shapes Data |
| grc | GX Compiled Resource File |
| grd | GRX Driver |
| grdecl | Eclipse ASCII Grid Data |
| grf | GraphEdit Filter Graph Data |
| grh | GX Resource Header File |
| grm | MINOS Data |
| groovy | Groovy Script |
| grp | Amazon Lumberyard Group Data |
| gs | Gofer Source Code |
| gs | Google Apps Script |
| gs | Gosu Class Data |