| File extension | Developer/Producer | File description |
|---|---|---|
| $01 file extension | Microsoft | MS-DOS Pipe Format |
| 001 file extension | Clickteam | Multimedia Fusion Backup Format |
| 11 file extension | IBM | IBM Voice Type Languages Scripts Data |
| 19 file extension | IBM | IBM Voice Type Languages Scripts Data |
| 2CLK file extension | UserLand Software, Inc. | Frontier Script Format |
| 3DFBAT file extension | Vladimir Galouchko | 3DField Command |
| 3RF file extension | Global Publishing Solutions Ltd, UK | Advent 3B2 Extensions Script Cross Reference |
| 4DB file extension | 4D | 4D Database Structure Format |
| 4GE file extension | IBM | IBM Informix 4GL Compiled Source Code |
| 4GL file extension | IBM | Informix 4GL Language Source Code |
| 4PK file extension | Pitrinec Software | Perfect Keyboard Macro Set |
| A file extension | N/A | Unix Static Object Code Library Format |
| A2W file extension | Carnegie Mellon University | Alice Program World Format |
| A51 file extension | ARM Holdings plc | µVision Assembler Source |
| A5R file extension | Adobe Systems Incorporated | Adobe Authorware Packaged File Without Runtime |
| A66 file extension | ARM Holdings plc | µVision Assembler Source |
| A86 file extension | Eric Isaacson Software | A86 Assembly Language Source Code |
| AB file extension | N/A | Applix Builder Format |
| ABC file extension | Adobe Systems | Adobe ActionScript Byte Code Format |
| ABL file extension | Xilinx, Inc. | ABEL Hardware Description Language |
| ACD file extension | Rockwell Automation | RSLogix 5000 Project Format |
| ACGI file extension | N/A | ACGI Script (WWW) |
| ACP file extension | ES-Computing | EditPlus Auto Completion Format |
| ACT file extension | Invisionsoft | DS Game Maker Action Format |
| ACTPROJ file extension | Microsoft Corporation | Microsoft Visual Studio Visual SourceSafe ACT Project |
| ACTX file extension | Invisionsoft | DS Game Maker Action Description Format |
| ACU file extension | Micro Focus International plc | Machine Independent COBOL Object |
| ADA file extension | N/A | ADA Language Source Code Format |
| ADB file extension | N/A | Ada Package Body Format |
| ADDIN file extension | Microsoft | Microsoft Visual Studio Addin Format |
| ADIUMSCRIPTS file extension | The Adium Team | Adium AppleScripts |
| ADS file extension | N/A | Ada Package Specification |
| AEM file extension | Planit Solutions Inc. | Alphacam Wire EDM Parameter Macro |
| AEP file extension | Answers 2000 | Activ E-Book Project Format |
| AFB file extension | Planit Solutions Inc. | Alphacam Flame VB Macro |
| AGC file extension | John Bridges | Compiled Script |
| AGI file extension | Digium | Asterisk Gateway Interface Format |
| AGLS file extension | Adobe Systems Incorporated | Adobe GoLive Snippet |
| AGO file extension | Soft Machines | Autolog Script |
| AGS file extension | John Bridges | AfterGRASP Script |
| AHTML file extension | N/A | HTML |
| AIDL file extension | Google Inc. | AIDL Interface |
| AIRI file extension | Adobe Systems Incorporated | Adobe AIR Intermediate |
| AKT file extension | Srinivas Annam | Aksharamala Keymap Source |
| ALB file extension | Alpha Software | Alpha Five Data Dictionary |
| ALM file extension | Planit Solutions Inc. | Alphacam Laser Parameter Macro |
| AM file extension | Automake | GLPK Automake/autoconf Makefile Definitions Format |
| AM4 file extension | Indigo Rose | AutoPlay Menu Studio Version 4 Project Format |
| AM5 file extension | Indigo Rose | AutoPlay Menu Studio Ver.5 Data Format |
| AM6 file extension | Indigo Rose | AutoPlay Menu Studio Ver.6 Data Format |
| AM7 file extension | Indigo Rose | AutoPlay Menu Studio Ver.7 Data Format |
| AMOS file extension | IBM | AMOS Basic Code |
| AMW file extension | Alcorn McBride, Inc. | Alcorn McBride Show Controller |
| ANE file extension | Adobe Systems | Adobe AIR Native Extension Format |
| ANJUTA file extension | The GNOME Project | Anjuta DevStudio Project Format |
| AP? file extension | Terry A. Davis | LoseThos C+ Source |
| APA file extension | Rockwell Automation | RSView Application Manager Archive |
| APB file extension | Planit Solutions Inc. | Alphacam Punch VB Macro |
| APG file extension | N/A | APGen Script |
| API_FILTERS file extension | The Eclipse Foundation | Eclipse API Settings |
| APLT file extension | Apple, Inc. | Mac OS X AppleScript Applet |
| APPCACHE file extension | N/A | HTML5 Cache Manifest |
| APPLET file extension | Eclipse | Eclipse IDE For Java Developers Format |
| APPX file extension | Microsoft | Microsoft AppX Application Package Format |
| APPXMANIFEST file extension | N/A | Windows Store App Source Manifest |
| APPXSYM file extension | Microsoft | Microsoft Visual Studio Windows 8 Application Information Format |
| APPXUPLOAD file extension | Microsoft | Microsoft Visual Studio Windows 8 Application Upload Format |
| APR file extension | Javid Software Development | Apadana Project Format |
| APS file extension | Microsoft | Microsoft Visual C++ Binary Version Of Resource Format |
| AP_ file extension | Google Android Development Resources Package Format | |
| ARB file extension | Planit Solutions Inc. | Alphacam Router VB Macro |
| ARMX file extension | Microsoft Corporation | ASP.NET Source |
| ARQ file extension | BMC Software, Inc. | BSM Action Request System Client Macro |
| ARSC file extension | Google Android Resource Format | |
| ART file extension | Versioned | Artifacts Artifact Format |
| ARTPROJ file extension | Versioned | Artifacts Project Format |
| ARXML file extension | N/A | AUTOSAR XML |
| ARY file extension | Hewlett-Packard Company | SmartStart Scripting Toolkit |
| AS file extension | Adobe Systems | Adobe Flash ActionScript Document |
| AS2PROJ file extension | FlashDevelop | FlashDevelop Project Format |
| AS3PROJ file extension | FlashDevelop | FlashDevelop ActionScript 3 Project Format |
| AS? file extension | Terry A. Davis | LoseThos Assembly Source |
| ASBX file extension | Microsoft Corporation | Microsoft ASP.Net BridgeHandler |
| ASC file extension | Adobe Systems | ActionScript Format |
| ASCS file extension | Adobe Systems | ActionScript Communication Server Format |
| ASDB file extension | Afterwarp Development | Asphyre Sphinx Archive |
| ASI file extension | Alpha Software | Alpha Five Storage Format |
| ASIC file extension | N/A | ASIC Source |
| ASM file extension | N/A | Assembler Source Code Format |
| ASO file extension | Micro Focus International plc | Turbo Assembler Object |
| ASP+ file extension | Microsoft Corporation | ASP.NET ASP+ |
| ASPROJ file extension | Microsoft Corporation | Microsoft Visual Studio Analysis Services Project |
| ASTX file extension | Adobe Systems Incorporated | Adobe Story Exported Script |
| ASVF file extension | Afterwarp Development | Asphyre Sphinx Archive |
| ASZ file extension | Terry A. Davis | LoseThos Assembly Source |
| ATMN file extension | Tethys Solutions, LLC. | Automation Anywhere Macro |
| ATP file extension | VSoft Technologies Pty Ltd | Automise Project |
| AU3 file extension | AutoIt | AutoIt V3 Script Format |
| AU? file extension | Terry A. Davis | LoseThos Autofile |
| AUT file extension | Jonathan Bennett | AutoIt Pre V3 Script Format |
| AUTOPLAY file extension | Indigo Rose | AutoPlay Media Studio Project Format |
| AVSI file extension | Ben Rudiak-Gould and all subsequent developers | Avisynth Script |
| AWL file extension | Gaev D.G. | Alternative Web Language Programming Language |
| AXE file extension | Codalogic | Annotated XML Example Format |
| AXS file extension | N/A | ActiveX Script |
| B file extension | N/A | BASIC Language Source Format |
| B24 file extension | David Pilling | Ovation Pro For RISC OS C Script |
| B2D file extension | CBS Interactive Inc. | Brutus2D Source Code |
| BAL file extension | N/A | Borland Programming Language Source Code |
| BAS file extension | N/A | Basic Source Code Format |
| BASEX file extension | BaseX Team | BaseX Data Format |
| BASH file extension | Apple, Inc. | Unix Shell Script (bash) |
| BB file extension | Blitz Research | Blitz Basic Source Code Format |
| BBC file extension | N/A | BBC BASIC For Windows |
| BBF file extension | ScriptBasic Project Team | ScriptBasic Binary |
| BBPROJECT file extension | Bare Bones Software | BBEdit Project Format |
| BBPROJECTD file extension | Bare Bones Software | BBEdit Project Format |
| BCP file extension | Borland | Borland C++ Makefile |
| BDH file extension | Borland Software Corporation | Silk Performer Include |
| BDSPROJ file extension | Embarcadero Technologies | BDS Project Format |
| BET file extension | N/A | BETA Source Format |
| BGM file extension | Tom Mulgrew | Basic4GL 3D Object |
| BHS file extension | Microsoft Studios | Rise Of Nations Script |
| BI file extension | Microsoft Corporation | Microsoft Visual Basic For DOS Include |
| BMO file extension | Siemens AG | SIMATIC WinCC Script |
| BORLAND file extension | Micro Focus International plc | Borland C Makefile |
| BP file extension | The Database Managers, Inc. | DataFlex Business Process Object |
| BPG file extension | Borland | Delphi Project Group Format |
| BPL file extension | N/A | Delphi Packed Library Format |
| BPO file extension | The Database Managers, Inc. | DataFlex Business Process Object |
| BPR file extension | Embarcadero Technologies | Borland C++ Builder XML Project Format |
| BPT file extension | N/A | COREX Segmentation |
| BRX file extension | QUALCOMM | BREW MP Application Resource Format |
| BS2 file extension | Parallax | BASIC Stamp 2 Code Format |
| BSC file extension | Microsoft | Microsoft Visual Studio Visual C++ Source Browser Information Format |
| BSH file extension | Patrick Niemeyer | BeanShell Script Format |
| BSM file extension | Microsoft Corporation | Project |
| BSV file extension | Bluespec, Inc. | Bluespec System Verilog |
| BTN file extension | Indigo Rose | AutoPlay Media Studio Button Format |
| BUFFEREDIMAGE file extension | Oracle Corporation | Java Class |
| BUILD file extension | SourceForge.net | NAnt Build Tool |
| BUILDER file extension | N/A | Builder Script |
| BUILDPATH file extension | Eclipse | Eclipse XML Build Path Format |
| BUR file extension | Fluffy Smoke Entertainment | BuRg3r Source Code Format |
| BXB file extension | NetMedia, Inc. | BasicX Compiled Project Bytecode |
| BXML file extension | N/A | Bean XML |
| BXP file extension | NetMedia, Inc. | BasicX-24 Basic Express Compiler Module List |
| BZS file extension | Rocket Software, Inc. | BlueZone Script |
| C file extension | N/A | C/C++main Source Code File Format |
| C# file extension | Microsoft Corporation | Microsoft Visual C# |
| C++ file extension | Microsoft Corporation | C++ Source Code |
| C-- file extension | Barry Kauler | Sphinx C-- Language Source Code |
| CAP file extension | Scirra | Construct Game Development Format |
| CAPFILE file extension | Ruby community | Ruby Capistrano Instruction |
| CAPROJ file extension | Scirra | Construct Game Project Format |
| CAPX file extension | Scirra | Construct Game Project Archive Format |
| CAR file extension | QUALCOMM | Brew MP Component Application Resource Format |
| CB file extension | CoolBasic Software | CoolBasic Src |
| CBA file extension | Crytek | CryENGINE Resource Compiler Settings Format |
| CBL file extension | N/A | Cobol Language Source Code Format |
| CBP file extension | Code::Blocks | Code::Blocks Project Format |
| CBQ file extension | Valemount Networks Corporation | StarOS Script |
| CC file extension | N/A | C++ Language Source Code Format |
| CCBJS file extension | Ambiera | CopperCube JavaScript Scene |
| CCGAME file extension | Microsoft | Microsoft XNA Game Studio Game Package Format |
| CCN file extension | Clickteam | Multimedia Fusion Development Format |
| CCS file extension | YesSoftware | CodeCharge Studio Project Format |
| CCSCC file extension | IBM | ClearCase Source Control Info Format |
| CCXML file extension | N/A | Call Control EXtensible Markup Language |
| CD file extension | Microsoft | ClassDiagram Format |
| CDXML file extension | Microsoft | Cmdlet Definition XML Format |
| CFC file extension | Adobe Systems | Adobe ColdFusion Component Format |
| CFI file extension | CleverForm Ltd. | CleverForm Script |
| CFO file extension | Embarcadero Technologies, Inc. | Turbo C Utilities C Form Object |
| CGVP file extension | NVIDIA Corporation | NVidia Cg Programming Language XML |
| CGX file extension | ARM Holdings plc | ARM RL-TCPnet HTTP Web Server XML Web Page Update Script |
| CHAM file extension | Zaplots | Compiled HAM Format |
| CHEF file extension | David Morgan-Mar | Chef Source Code Format |
| CHH file extension | N/A | C++ Header |
| CI file extension | The MathWorks | PolySpace Preprocessed Code Format |
| CKBX file extension | Cricket Technology | Cricket Audio XML Bank Description Format |
| CLA file extension | SoftVelocity | Clarion For DOS Source Code |
| CLASS file extension | Oracle | Java Bytecode Class Format |
| CLASSPATH file extension | The Eclipse Foundation | Eclipse IDE JAVA Project Related |
| CLIPS file extension | Panic | Coda For Mac Clips Format |
| CLJ file extension | N/A | Clojure Source Code |
| CLS file extension | N/A | JavaScript Class Definition Format |
| CLU file extension | N/A | CLUCalc CLUScript |
| CLW file extension | Microsoft | Microsoft Visual C++ MFC Class Wizard Information Format |
| CMA file extension | N/A | Camomile Library Format |
| CMAKE file extension | Kitware, Inc. | CMake Module |
| COB file extension | N/A | COBOL Programming Language Source Format |
| COD file extension | N/A | Blackberry Compiled Java Code |
| COMMON file extension | Apple, Inc. | Unix Script |
| CONFIG file extension | N/A | Configuration Format |
| CONFIGURE file extension | The Open Group | Bash |
| COVERAGE file extension | Microsoft Corporation | Microsoft Visual Studio Code Coverage |
| COVERAGEXML file extension | Microsoft Corporation | Microsoft Visual Studio Code Coverage |
| CP file extension | Apple | Xcode C++ Source Code Format |
| CP? file extension | Terry A. Davis | LoseThos C+ Source |
| CPB file extension | Comicino Media | Comicino Studio Project Format |
| CPP file extension | N/A | C++ Main Source Code File Format |
| CPRR file extension | Adobe Systems Incorporated | Adobe Captivate XML Script |
| CPZ file extension | Terry A. Davis | LoseThos C+ Source |
| CR file extension | Vital Inc | CRiSP Source Code |
| CREOLE file extension | N/A | Creole Source |
| CS file extension | Microsoft | Microsoft Visual Studio Visual C#.NET Source Format |
| CSB file extension | Corel Corporation | Corel PHOTO-PAINT Script |
| CSC file extension | Corel Corporation | CorelDRAW Corel SCRIPT Script |
| CSGRAD file extension | Microsoft Corporation | Microsoft Visual Studio Gradients |
| CSHRC file extension | N/A | UNIX Command |
| CSI file extension | ContentServ | ContentServ CS EMMS Suite Include Format |
| CSML file extension | N/A | Chemical Style Markup Language |
| CSN file extension | Adobe Systems | Adobe Dreamweaver Snippet Format |
| CSPROJ file extension | Microsoft | Microsoft Visual Studio Visual C# Project Format |
| CST file extension | ContentServ | ContentServ Template |
| CSVIEW file extension | Microsoft Corporation | Microsoft Visual Studio Views |
| CSX file extension | Microsoft | Microsoft Visual C# Primary Script Format |
| CTL file extension | Microsoft | Visual Basic Control File (Active X Control File) |
| CTP file extension | Cake Software Foundation | CakePHP Template Format |
| CTX file extension | Microsoft | Visual Basic User Control Binary Format |
| CTXT file extension | University of Kent | BlueJ Information Format |
| CU file extension | NVIDIA | CUDA Source Code Format |
| CVSRC file extension | N/A | TortoiseCVS CVS Command |
| CX file extension | Orbitech Ltd. | CodeMapper Script |
| CXE file extension | N/A | Common XML Envelope |
| CXP file extension | OMRON | Omron CX Programmer Format |
| CXX file extension | N/A | C++ Main Source Code File Format |
| CYA file extension | CYANA Development Team | Cyana Macro |
| C__ file extension | N/A | C++ Source Code |
| D file extension | N/A | D Programming Language Source Code Format |
| D4 file extension | N/A | Dataphor Source |
| DABRIEFCASE file extension | RemObjects | RemObjects Data Abstract File Briefcase |
| DACONFIG file extension | RemObjects | RemObjects Data Abstract Configuration Format |
| DAEMONSCRIPT file extension | DT Soft Ltd | Daemon Tools Script |
| DATASOURCE file extension | Microsoft Corporation | Microsoft Visual Studio Data Source |
| DB2TBL file extension | Microsoft Corporation | Microsoft Visual Studio DB2 Table Script |
| DB2TR file extension | Microsoft Corporation | Microsoft Visual Studio DB2 Trigger Script |
| DB2VW file extension | Microsoft Corporation | Microsoft Visual Studio DB2 View Script |
| DBHEADER file extension | BoostYourPC.com | Download Boost Header |
| DBML file extension | Microsoft | Microsoft Visual Studio Object Relational OR Designer Format |
| DBO file extension | The Game Creators | DarkBASIC Source Code Format |
| DBP file extension | Microsoft Corporation | Microsoft Visual Studio Visual C++ Database Project |
| DBPRO file extension | The Game Creators | DarkBASIC Project Format |
| DBPROJ file extension | Microsoft | Microsoft Visual Studio Visual C++ Database Project Format |
| DCP file extension | N/A | Delphi Component Package Format |
| DCPROJ file extension | Apple | Dashcode Project |
| DCU file extension | N/A | Delphi Compiled Unit Format |
| DCUIL file extension | Embarcadero Technologies | Delphi Compiled Unit Format |
| DDP file extension | Embarcadero Technologies | Delphi Diagram Page From Compiler |
| DEC file extension | N/A | VersaPro Declaration Format |
| DEF file extension | N/A | Definition Format |
| DEP file extension | Microsoft | Microsoft Visual Basic Setup Wizard Dependency Format |
| DEPEND file extension | Code Blocks | Code::Blocks Project Support Format |
| DEV file extension | Bloodshed | Dev-C++ Project Format |
| DEVELOPERPROFILE file extension | Apple | Apple Xcode Developer Profile Format |
| DEVICEIDS file extension | Apple | Apple IOS Device Identification Format |
| DEVPAK file extension | Bloodshed | Dev-C++ Developer Package |
| DEX file extension | Google Android Compiled Executable Format | |
| DF1 file extension | Raining Data | Omnis7 And Omnis Studio Database File Format |
| DFB file extension | Interscape, Software Solutions | Data Flask Formula |
| DFK file extension | Invisionsoft | Dark Flow Project Format |
| DFM file extension | Borland | Delphi Win32 Form Format |
| DFN file extension | N/A | Delphi Definition |
| DG file extension | The Database Managers, Inc. | Source Code For A Dialog Box |
| DGML file extension | Microsoft | Microsoft Visual Studio Directed Graph Markup Language Format |
| DGSL file extension | Microsoft | Microsoft Visual Studio Visual Shader Graph Format |
| DI file extension | N/A | D Programming Language Source Code |
| DIFF file extension | N/A | Diff Source |
| DIS file extension | NETdecompiler.com | DisSharp Project Format |
| DJG file extension | Delorie Software | DJGPP Compiler Makefile |
| DM1 file extension | Embarcadero Technologies | ER/Studio Database Model Format |
| DMD file extension | Oracle | Oracle SQL Developer Data Modeler Data Format |
| DOB file extension | N/A | Microsoft Visual Basic User Document Form Format |
| DOCSET file extension | Doxygen | Doxygen Source Code Documentation Format |
| DOCSTATES file extension | Microsoft Corporation | Microsoft Visual Studio Document Tab Well |
| DOR file extension | Graphisoft | ArchiCAD Geometric Description Language |
| DOX file extension | N/A | Microsoft Visual Basic User Document Binary Form Format |
| DPJ file extension | Embarcadero Technologies, Inc. | Borland Delphi Project |
| DPK file extension | N/A | Delphi Package Source Format |
| DPKW file extension | Embarcadero Technologies | Delphi Package |
| DPL file extension | N/A | Delphi Packed Library Format |
| DPLT file extension | Apple, Inc. | AppleScript Droplet |
| DPQ file extension | SoftVelocity | Clarion |
| DPR file extension | N/A | Delphi Project Format |
| DPROJ file extension | Embarcadero Technologies | Delphi Project Format |
| DRES file extension | Embarcadero Technologies | Delphi Compiled Resource Format |
| DRF file extension | Embarcadero Technologies | Delphi Resource Format |
| DSGM file extension | Invisionsoft | DS Game Maker Project |
| DSK file extension | Borland | Borland Project Desktop Format |
| DSP file extension | Microsoft | Microsoft Developer Studio Project Format |
| DSQ file extension | Corel Corporation | Corel Query Language |
| DSR file extension | Microsoft Corporation | Microsoft Visual Basic Active Designer |
| DSYM file extension | Apple | Apple Xcode Debug Symbols Format |
| DTD file extension | N/A | Document Type Definition Format |
| DTML file extension | N/A | Zope Document Template Markup Language |
| DTO file extension | Funduc Software | Directory Toolkit Output |
| DVB file extension | Autodesk, Inc. | Autodesk AutoCAD VBA Source Code |
| DYLIB file extension | Apple | Xcode Dynamic Library Format |
| E file extension | Eiffel Software | EiffelStudio Source |
| EAF file extension | N/A | ELAN Annotation Format |
| EBC file extension | SourceForge.net | MediaBASIC Compiled Project |
| EBX file extension | IBM | Rational Rose 98 Compiled Script |
| ECORE file extension | The Eclipse Foundation | Kermeta Ecore Diagram |
| ECOREDIAG file extension | The Eclipse Foundation | Kermeta Ecore Diagram Information |
| ECP file extension | Intelitek | EasyC Project Format |
| EDM file extension | Adobe Systems | Adobe Extension Data Markup Language (EDML) Format |
| EDML file extension | Adobe Systems | Adobe Extension Data Markup Language (EDML) Document Format |
| EDMX file extension | Microsoft | Microsoft Visual Studio Entity Data Model Format |
| EGG-INFO file extension | N/A | Python Egg |
| EJS file extension | Bitovi Consulting | Embedded JavaScript Template |
| EKM file extension | Symbol Dynamics | EXP Macro |
| EL file extension | The GNU Project | Emacs Lisp Programming Language Source Code |
| ELC file extension | The GNU Project | Emacs Compiled Lisp Format |
| EMAKEFILE file extension | N/A | Erlang Make |
| EMAKERFILE file extension | N/A | Erlang Make |
| ENT file extension | N/A | External Entity |
| ENTITLEMENTS file extension | Apple | Apple Mac OS X Sandbox Format |
| EPHTML file extension | N/A | Enhanced Perl-parsed HTML |
| EPJ file extension | Embarcadero Technologies, Inc. | RapidSQL SCCS Project |
| EPT file extension | SoftVelocity | Clarion For Windows Embed Points |
| EQL file extension | N/A | Embedded SQL Format |
| ERL file extension | Ericsson | Erlang Source Or Script Format |
| ERUBIS file extension | kuwata-lab | Erubis Script |
| EV3P file extension | LEGO Group | LEGO MINDSTORMS Program |
| EX file extension | Rapid Deployment Software | Euphoria Source Code |
| EXL file extension | JSDAI | JSDAI Inclusion Or Exclusion List |
| EXP file extension | N/A | CATIA Export Format |
| EXSD file extension | The Eclipse Foundation | Eclipse IDE Extension Point Schema |
| EXU file extension | Rapid Deployment Software | Euphoria For Linux Source Code |
| EXW file extension | Rapid Deployment Software | Euphoria Windows Source Code Format |
| EZE file extension | N/A | ErZorScript Source |
| F file extension | N/A | Fortran Source Format |
| F90 file extension | N/A | Intel Fortran 90 Language Source Format |
| F95 file extension | N/A | Fortran 95 Language Source Code |
| FACTORYPATH file extension | The Eclipse Foundation | Eclipse Factorypath |
| FBP file extension | wxFormBuilder | WxFormBuilder Project Format |
| FBP7 file extension | VSoft Technologies | FinalBuilder 7 Project |
| FBZ6 file extension | VSoft Technologies Pty Ltd | FinalBuilder Compressed Project |
| FBZ7 file extension | VSoft Technologies | Compressed FinalBuilder 7 Project |
| FCE file extension | EaSynth Solution | ForeUI Custom Element Format |
| FCG file extension | N/A | FastCGI Script |
| FCL file extension | EaSynth Solution | ForeUI Custom Library Format |
| FD file extension | Data Access | DataFlex Field Offsets For Compiler |
| FDML file extension | N/A | Forms Definition Markup Language |
| FEATURE file extension | Microsoft | Microsoft Visual Studio SharePoint Feature Format |
| FGB file extension | N/A | Valve SDK Source |
| FGL file extension | Fifth Generation Systems | Fifth Generation Language (5GL) Source Code Format |
| FILTERS file extension | Microsoft | Microsoft Visual Studio VCX Project Filter Format |
| FIMPP file extension | N/A | FiM++ Source Code Format |
| FLA file extension | Adobe Systems | Editable Adobe Flash Movie Format |
| FLM file extension | SourceForge.net | Flasm Disassembled Flash ActionScript Bytecode |
| FMB file extension | Oracle Corporation | Oracle Binary Source Code |
| FOR file extension | N/A | Fortran Source Format |
| FORM file extension | Oracle Corporation | Java Form |
| FORTH file extension | N/A | Forth Source Code |
| FOUNTAIN file extension | N/A | Fountain Syntax |
| FPA file extension | N/A | Front Panel Designer Encrypted Order Format |
| FPC file extension | Free Pascal team | FreePascal Compiler Makefile |
| FPD file extension | N/A | Front Panel Designer Order Format |
| FPM file extension | The Game Creators | FPS Creator Map Format |
| FPP file extension | N/A | Front Panel Designer Project Format |
| FRAMEWORK file extension | N/A | Apple Mac OS X Application Framework Format |
| FRJ file extension | FreeForm-J | FreeForm-J Project Format |
| FRM file extension | N/A | Visual Basic Text Form |
| FRX file extension | N/A | Visual Basic Form Format |
| FS file extension | Microsoft | Microsoft Visual F# Source Code Format |
| FSI file extension | Microsoft | Microsoft Visual F# Signature Format |
| FSL file extension | AutoDesSys | Form•Z Script |
| FSPROJ file extension | Microsoft | Microsoft Visual Studio Visual F# Project Format |
| FSSCRIPT file extension | Microsoft | Microsoft Visual Studio F# Script Format |
| FSX file extension | Microsoft | Microsoft Visual Studio F# Script Format |
| FTL file extension | The FreeMarker Project | FreeMarker Template Format |
| FTN file extension | N/A | Fortran Language Source Code Format |
| FUS file extension | FXpansion™ Audio UK Ltd. | GURU Uninstall Script |
| FWX file extension | Aegis Group | FoxWeb Script |
| FXCPROJ file extension | NVIDIA | NVidia FX Composer Project Format |
| FXL file extension | OC3 Entertainment | FaceFX Batch Format |
| FXML file extension | Oracle Corporation | Oracle FXML Language Source Code |
| FXPL file extension | Adobe | Adobe Flash Catalyst FXP Library Format |
| GAMEPROJ file extension | GameSalad | GameSalad Game Project Format |
| GAR file extension | GridGain Systems | GridGain Archive |
| GBAP file extension | Dream Design Entertainment | Dream Design Entertainment GLBasic Project Format |
| GBAS file extension | Dream Design Entertainment | Dream Design Entertainment GLBasic Source Format |
| GBL file extension | Microsoft Corporation | Microsoft Visual Basic Global Definition |
| GC3 file extension | Gold Hill Co. | Golden Common Lisp Source Code |
| GCH file extension | N/A | C++ Precompiled Header |
| GCODE file extension | N/A | G-code Source |
| GDFMAKERPROJECT file extension | Microsoft | GDF Editor Project Format |
| GED file extension | Game Editor | Game Editor Project Format |
| GEM file extension | Ruby | GEM Vector Picture Format |
| GEMFILE file extension | Ruby community | Ruby RubyGems |
| GEMSPEC file extension | RubyGems | Ruby RubyGems Specification Format |
| GENERICTEST file extension | Microsoft Corporation | Microsoft Visual Studio Generic Test |
| GENMODEL file extension | The Eclipse Foundation | Eclipse IDE Domain Gen Model |
| GFA file extension | GFA Software Technologies | GFA-BASIC Tokenized Source |
| GHC file extension | Microsoft Corporation | Visual Basic Constant Map |
| GIT file extension | Linus Torvalds | Git Repository |
| GITIGNORE file extension | Git | Git Ignore Format |
| GLADE file extension | The Glade Project | Glade Project Format |
| GLD file extension | Microchip Technology | MPLAB C Compiler Linker Script Format |
| GLOBAL file extension | N/A | Global Makefile |
| GLS file extension | GLScript | GLScript Format |
| GM file extension | GameMonkey Script | GameMonkey Script |
| GM6 file extension | YoYo Games | Game Maker Project Format |
| GM81 file extension | YoYo Games | GameMaker Data Format |
| GMD file extension | N/A | Game Maker Stored Game |
| GMK file extension | YoYo Games | Game Maker Project Format |
| GML file extension | Yoyo Games | Game Maker Script Format |
| GMO file extension | N/A | GNU Gettext Machine Object Format |
| GNT file extension | Micro Focus International plc | Micro Focus COBOL Generated Code |
| GNUMAKEFILE file extension | GNU | GNU Make Makefile |
| GO file extension | N/A | Google Go Programming Language Source Code |
| GOC file extension | Berkeley Softworks | GEOS GOC Source Code |
| GORM file extension | N/A | Gorm Interface Resource Format |
| GPJ file extension | Green Hills Software | MULTI IDE Project Format |
| GREENFOOT file extension | Greenfoot.org | Greenfoot Project |
| GROOVY file extension | VMware, Inc. | Groovy Programming Language Script Format |
| GROUPPROJ file extension | Embarcadero Technologies | Delphi Project Group Format |
| GRXML file extension | N/A | Grammar |
| GS3 file extension | GameStarter | Genecyst Game Save State 1 Format |
| GSPROJ file extension | GameSalad | GameSalad Project Format |
| GSYM file extension | Graphisoft | ArchiCAD For Mac Geometric Description Language |
| GSZIP file extension | GameSalad | GameSalad Market Asset Format |
| GUS file extension | Getscores.org | Universal Score Poster Script |
| GVY file extension | VMware, Inc. | Groovy Script Format |
| GYP file extension | Microsoft Corporation | Google Chromium GYP Input Configuration |
| GYPI file extension | N/A | Chrome/Chromium Include |
| H file extension | N/A | C/C++ Header Format |
| H++ file extension | N/A | Unusual C++ Header |
| H86 file extension | ARM Holdings plc | CP/M |
| HAL file extension | HansaWorld | HansaWorld Enterprise HAL Code Format |
| HAML file extension | Sublime HQ Pty Ltd | HTML Abstraction Markup Language |
| HAS file extension | N/A | Haskell Script Format |
| HBM file extension | Hibernate Project | Hibernate Script |
| HBZ file extension | Star Finanz GmbH | StarMoney Macro |
| HCF file extension | Zaplots | Compact Ham Library |
| HCW file extension | Microsoft Corporation | HTML Help Workshop Conversion Wizard Macro |
| HH file extension | N/A | C++ Header Format |
| HHH file extension | Power C | Power C Precompiled Header Format |
| HIC file extension | HicEst Instant Prototype Computing | HicEst Script |
| HISTORY file extension | The Eclipse Foundation | Eclipse IDE Local History |
| HLA file extension | N/A | High Level Assembler Source |
| HP? file extension | Terry A. Davis | LoseThos C+ Header |
| HPF file extension | N/A | High Performance FORTRAN Format |
| HPP file extension | N/A | C++ Header Format |
| HRL file extension | Ericsson | Erlang Source Or Script Format |
| HS file extension | N/A | Literate Haskell Source Code Or Script Format |
| HSE file extension | Adobe Systems Incorporated | Adobe Dreamweaver Snippet |
| HT4 file extension | N/A | HTML Version 4 |
| HTR file extension | Microsoft Corporation | Microsoft Windows NT Password Services Script |
| HX file extension | Haxe.org | Haxe Source Code |
| HXML file extension | Haxe.org | HaXe Make |
| HXP file extension | Haxe.org | HaXe Project |
| HXPROJ file extension | FlashDevelop.org | FlashDevelop Flash Project |
| HXX file extension | N/A | C++ Header Format |
| HYDRA file extension | Adobe Systems | Hydra Image Filter Program Format |
| H__ file extension | N/A | C++ Header |
| I file extension | Microsoft | Borland C++ Intermediate Preprocessor Output Format |
| IDB file extension | Microsoft | Microsoft Visual Studio Developer Intermediate Debug Format |
| IDL file extension | Microsoft | Visual Studio Visual C++ Interface Definition Library Format |
| IDT file extension | Microsoft | Windows Installer Exported Database Table Format |
| IJS file extension | JSoftware | J Interpretor Script Format |
| IL file extension | N/A | Euphoria Shrouded Source Code |
| ILK file extension | Microsoft | Incremental Linking Format |
| IML file extension | JetBrains | IntelliJ IDEA Module Format |
| INC file extension | N/A | Include Format |
| INL file extension | Microsoft | Microsoft Visual C++ Inline Function Format |
| INO file extension | Arduino | Arduino Sketch Format |
| IPB file extension | N/A | IPhone Perl Script |
| IPCH file extension | Microsoft | Microsoft Visual C++ Intellisense Precompiled Header Format |
| IPP file extension | N/A | Inline Guard Macro Format |
| IPPROJ file extension | Microsoft Corporation | Microsoft Visual Studio InfoPath Project |
| IPR file extension | Flexera Software | InstallShield Project Format |
| IRBRC file extension | Ruby community | Ruby |
| IRC file extension | Raphaël Mudge | JIRCii Script |
| IREV file extension | RunRev Ltd. | Runtime Revolution Script |
| IROBO file extension | Arvid Halma | RoboMind Source Code |
| ISA file extension | Adobe Systems Incorporated | Adobe Photoshop ImageReady Action |
| ISC file extension | N/A | Xilinx Device Configuration Information Format |
| ISE file extension | Flexera Software | InstallShield Express Project Format |
| ISM file extension | Flexera Software | InstallShield Project Format |
| IST file extension | Flexera Software | InstallShield Project Template Format |
| ISYM file extension | Graphisoft | ArchiCAD For Mac Geometric Description Language |
| ITCL file extension | Red Hat, Inc. | Cygwin Iwidgets Scripts |
| IWS file extension | JetBrains | IntelliJ IDEA Web Page Format |
| IWZ file extension | Flexera Software | InstallShield Express Project Format |
| J file extension | Oracle | Java Source Code |
| JACL file extension | IBM | IBM WebSphere Server Script |
| JADE file extension | N/A | Jade Programming Language Source Code |
| JAV file extension | Oracle | Java Language Source Code Format |
| JAVA file extension | Oracle | Java Language Source Code Format |
| JAVAJET file extension | The Eclipse Foundation | Eclipse JET Java Template |
| JCM file extension | Oracle Corporation | Java Commerce Message |
| JCP file extension | Xinox Software | JCreator Project Format |
| JCS file extension | Oracle Corporation | Java Control Source |
| JDP file extension | BlackBerry (Research In Motion Limited) | BlackBerry JDE |
| JED file extension | N/A | Xilinx Integrated Software Environment Device Configuration Information Format |
| JETINC file extension | The Eclipse Foundation | Eclipse IDE Template Fragment |
| JGS file extension | Jolly Giant Software Inc. | QWS3270 PLUS Script |
| JIC file extension | N/A | JTAG Indirect Configuration Format |
| JKS file extension | Oracle Corporation | Java KeyStore |
| JL file extension | Julia | Julia Source Code Format |
| JLC file extension | N/A | Byte Compiled Lisp-based Script |
| JML file extension | N/A | Java Modeling Language Specification |
| JNILIB file extension | Oracle | Mac OS X Java JNI Library Format |
| JOMPROJ file extension | Microsoft Corporation | Microsoft Visual Studio JOOB Object Model Project |
| JPAGE file extension | The Eclipse Foundation | Eclipse Java Scrapbook Page |
| JPD file extension | N/A | Joint PhotoDefiner Image Format |
| JPR file extension | N/A | Oracle JDeveloper Model Project |
| JPX file extension | N/A | JBuilder Project Format |
| JSA file extension | Adobe Systems Incorporated | JRun Server Application |
| JSB file extension | Freedom Scientific, Inc. | JAWS Script Binary |
| JSFL file extension | Adobe Systems | Flash JavaScript Format |
| JSH file extension | Freedom Scientific | JAWS Script Header Format |
| JSM file extension | Freedom Scientific, Inc. | JAWS Script Message |
| JSON file extension | N/A | JavaScript Object Notation Format |
| JSONP file extension | N/A | JSON-with-padding Source Code |
| JSPF file extension | Oracle | Java JSP Fragment |
| JSS file extension | Freedom Scientific | JAWS Script Source Format |
| JSXINC file extension | Adobe Systems | ExtendScript Included Script Format |
| JTB file extension | Oracle Corporation | JTB JavaCC Grammar |
| KB file extension | Borland | Borland C++ Keyboard Script Format |
| KDEVDLG file extension | Free Software Foundation | KDevelop Dialogue Box Format |
| KDEVELOP file extension | Free Software Foundation | KDevelop Project Data Format |
| KDEVPRJ file extension | Free Software Foundation | KDevelop Project Format |
| KDMP file extension | Microsoft | Microsoft Windows Crash Dump Format |
| KED file extension | Mansfield Software Group, Inc. | KEDIT Profile And Macro Format |
| KEX file extension | Mansfield Software Group, Inc. | KEDIT Profile Macro |
| KMDI file extension | The Eclipse Foundation | Kermeta |
| KMT file extension | The Eclipse Foundation | Kermeta |
| KOMODO file extension | Charles Brej PhD, BSc | KMD |
| KPL file extension | The Phrogram Company | Kids Programming Language Source Code Format |
| LAMP file extension | Graphisoft | ArchiCAD For MAC Geometric Description Language |
| LBI file extension | Adobe Systems | Adobe Dreamweaver Library Format |
| LBS file extension | Raining Data | Omnis Studio Application Format |
| LDS file extension | N/A | Linux Compile Time Header Format |
| LDZ file extension | Microsoft Corporation | Microsoft Visual Studio DSM Project |
| LGO file extension | Softronics | Logo Instructions Format |
| LHS file extension | N/A | Literate Haskell Programming Language Source Code Format |
| LICENSES file extension | Microsoft | Microsoft Visual Studio Licensed Classes Format |
| LICX file extension | Microsoft | Microsoft Visual Studio License Format |
| LIQUID file extension | N/A | Shopify Liquid Template |
| LIS file extension | N/A | VAX Program Listing |
| LISP file extension | N/A | LISP Translators Format |
| LIST file extension | Oracle | JAR Index Format |
| LIT file extension | N/A | Literate Haskell Script Format |
| LMP file extension | Graphisoft | ArchiCAD Geometric Description Language |
| LMV file extension | Adobe Systems Incorporated | Adobe Flash Source Code |
| LNP file extension | ARM Holdings plc | µVision Linker Input Format |
| LNT file extension | Gimpel Software | PC-lint Configuration Format |
| LOGIN file extension | The Open Group | UNIX Command |
| LOL file extension | Adam Lindsay | Lolcode Source Format |
| LOLS file extension | N/A | LOLCODE Source Code |
| LPR file extension | http://www.lazarus.freepascal.org/ | Lazarus Project |
| LPROJ file extension | N/A | Mac OS X Localized Project Folder Format |
| LPX file extension | Nick Van Beurden | LaTeXPiX Script |
| LRDB file extension | Adobe Systems | Photoshop Lightroom Database |
| LRF file extension | Microsoft | Microsoft C/C++ Linker Response Format |
| LS1 file extension | Microsoft Corporation | Microsoft Winhelp Source |
| LSP file extension | N/A | LISP Source Code Format |
| LSPROJ file extension | Microsoft | Visual Studio LightSwitch Project |
| LSS file extension | IBM | LotusScript Source Code |
| LUA file extension | N/A | Lua Script Format |
| LUAC file extension | N/A | Lua Compiled Source Code |
| LUCA file extension | N/A | Luca Template |
| LWA file extension | John McKernon Software | Lightwright Automated Action |
| LWMW file extension | Likno Software Inc. | Likno Web Modal Windows Builder |
| LXK file extension | N/A | COREX Lexicon Link-up |
| LXSPROJ file extension | Liquid Technologies | Liquid XML Studio Project Format |
| M file extension | Apple | Objective-C Language Source Format |
| M2R file extension | N/A | Avaya Mib2Rules Perl Script |
| M4 file extension | N/A | M4 Preprocessor Macro Format |
| M51 file extension | ARM Holdings plc | ARM Keil Tools Linker Listing |
| MAGIK file extension | GE | Magik Source Code Format |
| MAK file extension | N/A | Make Format |
| MAKE file extension | Apple | Makefile |
| MAKEFILE file extension | N/A | Makefile |
| MAKI file extension | Nullsoft, Inc. | Winamp MAKI Compiled Script |
| MAKO file extension | Mako | Mako Tamplate Format |
| MAML file extension | Microsoft Corporation | Microsoft Assistance Markup Language |
| MARKDN file extension | John Gruber | Markdown Markup Language Document Format |
| MARKDOWN file extension | John Gruber | Markdown Markup Language Format |
| MASH file extension | Oracle Corporation | Java |
| MATLAB file extension | N/A | Matlab Script |
| MBAS file extension | MikroElektronika | MikroBasic Source Code |
| MBTEMMPLATE file extension | Widget Press, Inc. | ModelBaker Custom Template Directory |
| MC file extension | Microsoft Corporation | Microsoft Windows Localized Message Table Resource |
| MCML file extension | Microsoft Corporation | Microsoft Windows Media Center MCML |
| MCP file extension | Freescale Semiconductor | CodeWarrior Project Format |
| MD file extension | N/A | Machine Description Format |
| MDOWN file extension | John Gruber | Markdown Markup Language Format |
| MDZIP file extension | No Magic | MagicDraw Compressed Project Format |
| MED file extension | Rockwell Automation | Rockwell RSView Development Project Format |
| MEDIAWIKI file extension | N/A | Mediawiki Source |
| MER file extension | Rockwell Automation | Corel WordPerfect Macro Editor Resident Area Format |
| MF file extension | Sun Microsystems | Java Manifest Format |
| MFA file extension | Clickteam | Multimedia Fusion Development Format |
| MFCRIBBON-MS file extension | Microsoft | MFC Ribbon Definition XML Format |
| MFPS file extension | CYZSoft | Scientific Calculator Plus Script |
| MI file extension | N/A | Winamp MAKI Scripting Library |
| MINGW32 file extension | MinGW.org | Mingw Compiler |
| MK file extension | N/A | Makefile Format |
| MKB file extension | Ideaworks3D Limited | Marmalade SDK Project |
| MKE file extension | Microsoft Corporation | Microsoft Windows SDK Make |
| ML file extension | Robin Milner | ML Language Source Code Format |
| MLB file extension | Microsoft | FoxPro For Macintosh Library |
| MLI file extension | N/A | F# Source Code |
| MLN file extension | The Alchemy Team | Alchemy Source |
| MLSXML file extension | Skype Limited | Skype XML |
| MLY file extension | N/A | OCaml Ocamlyacc Input |
| MMB file extension | Oracle Corporation | Oracle Forms Menu Binary Source Code |
| MMCH file extension | Freescale Semiconductor, Inc. | CodeWarrior Compiled Hdr |
| MMH file extension | BioWare | Dragon Age Model Mesh Heirarchy |
| MMJS file extension | Adobe Systems Incorporated | Adobe JavaScript Document |
| MND file extension | Autodesk, Inc. | AutoCAD Menu Compiler |
| MO file extension | N/A | GNU Gettext Machine Object Format |
| MOC file extension | N/A | MOCHA Java Script |
| MOD file extension | N/A | Fortran Module Format |
| MOM file extension | Apple | Managed Object Model |
| MP? file extension | Terry A. Davis | LoseThos Compiler Map |
| MPKT file extension | MOPEKS Organisation | MOPEKS Trial |
| MPR file extension | N/A | Visual FoxPro Generated Menu Program |
| MQT file extension | MetaQuotes Software Corp. | MetaQuotes Language 4 MQL4 Template |
| MRD file extension | MathRevolt | MathRevolt Infinity Document |
| MRL file extension | N/A | MRLR Multimedia Retrival Markup Language |
| MRT file extension | Stimulsoft | Stimulsoft Report Format |
| MSCR file extension | JackAss JoeJoe | Rename Master Scrip |
| MSCT file extension | MOPEKS Organisation | MOPEKS Script |
| MSDEV file extension | Microsoft Corporation | Microsoft Visual C+ Make |
| MSDL file extension | N/A | Manchester Scene Description Language |
| MSHA file extension | Microsoft | Microsoft Help Library Help Manifest Format |
| MSHC file extension | Microsoft | Microsoft Help Container Format |
| MSHI file extension | Microsoft | Microsoft Help Index Format |
| MSIL file extension | N/A | Microsoft Intermediate Language |
| MSL file extension | Microsoft | DocumentDirect And DocumentDirect Applications Suite File Format |
| MSP file extension | MAXSIS | Max Script Page |
| MSS file extension | Xilinx | Xilinx Software Specification Format |
| MSVC file extension | Microsoft Corporation | Microsoft Visual C++ Compiler Makefile |
| MSYM file extension | Graphisoft | ArchiCAD For MAC Geometric Description Language |
| MV file extension | Miva Merchant | MivaScript Format |
| MVX file extension | Clickteam | Multimedia Fusion Movement Extension Format |
| MXML file extension | Adobe Systems | Adobe Flex Interface Component Format |
| MYAPP file extension | Microsoft | Microsoft Visual Studio Application XML Format |
| NAS file extension | N/A | Nasal Script |
| NBC file extension | NBC | Next Byte Codes Source Code Format |
| NBIN file extension | Tenable Network Security | Compiled NASL Script |
| NCB file extension | Microsoft | Microsoft Developer Studio Non-compiled Browse Format |
| NED file extension | OMNeT++ Community | OMNet++ Network Description Format |
| NEKO file extension | Nicolas Cannasse | Neko Source Code Format |
| NETBOOT file extension | The Open Group | Unix Netboot Script |
| NFM file extension | Embarcadero Technologies | Delphi .NET Form Format |
| NHS file extension | NHibernate Developers | NHibernate |
| NIB file extension | N/A | Interface Builder User Interface Resources |
| NIM file extension | Nimrod Software Foundation | Nimrod Source Code Format |
| NK file extension | The Foundry | NUKE Script Format |
| NLC file extension | Nero AG | Nero Linux Compilation |
| NMK file extension | Microsoft Corporation | Microsoft Program Maintenance Utility Make |
| NMS file extension | Dassault Systèmes S.A. | Virtools Graphical Script |
| NPI file extension | dataBased Intelligence, Inc. | DBASE Application Generator Source |
| NQC file extension | Dave Baum | NQC Not Quite C Source Code Format |
| NSE file extension | N/A | Nmap Security Scanner Scripting Engine |
| NSH file extension | Nullsoft | NSIS Header Format |
| NSI file extension | Nullsoft | NSIS Nullsoft Scriptable Install System Script Format |
| NUPKG file extension | NuGet | NuGet Source Code Package Format |
| NUSPEC file extension | NuGet | NuGet Settings Format |
| NXC file extension | The LEGO Group | NXC Not EXactly C Source Code Format |
| O file extension | N/A | Object Format |
| OBR file extension | Micro Focus International plc | Borland C++ Object Browser Data |
| OCA file extension | Microsoft | Custom Control Library Type Format |
| OCAMLMAKEFILE file extension | N/A | Caml Programming Language Makefile |
| OCB file extension | OriginLab Corporation | Origin Precompiled Origin C |
| OCTEST file extension | Apple | Xcode Objective-C Unit Test Bundle |
| OCX file extension | Microsoft | ActiveX Control Format |
| ODH file extension | Microsoft Corporation | Microsoft Visual Studio Interface Definition Language |
| ODL file extension | Microsoft | Object Description Language Format |
| OGL file extension | N/A | ATI Overlay Source Code |
| OGR file extension | N/A | OGR C++ Open Source Library |
| OKM file extension | Open Knowledge Management | Open Knowledge Management Script |
| OKS file extension | Mike Mardesich | OKScript |
| OMO file extension | OMake | OMake Object Format |
| OPLM file extension | N/A | Outline Processor Markup Language |
| ORDEREDTEST file extension | Microsoft | Microsoft Visual Studio Ordered Test Format |
| ORL file extension | N/A | Object-Relational Language |
| OS file extension | ObjectScript | ObjectScript Source Format |
| OSAS file extension | N/A | Apple Script Library Tani Script |
| OSC file extension | N/A | Obix Source Code Format |
| OSG file extension | osg.js | OSGJS JSON Input |
| OW file extension | Free Pascal | Free Pascal For Windows Object Format |
| OWL file extension | N/A | OWL (Obfuscated Weird Language) Source Code Format |
| OX file extension | Jurgen A Doornik | Ox Object-oriented Matrix Programming Language |
| OXYGENE file extension | RemObjects | Oxygene Project Format |
| P file extension | N/A | Pascal Language Source Code Format |
| P6 file extension | N/A | Perl 6 Source Code Format |
| PAG file extension | Microsoft Corporation | Visual Basic Property PAGe |
| PARAM file extension | Castep team | CASTEP Scripts |
| PAS file extension | N/A | Delphi Unit Source Format |
| PB file extension | Fantaisie | PureBasic Source Code |
| PBG file extension | Adobe Systems | Adobe Pixel Bender Graph Language Format |
| PBJ file extension | Adobe Systems | Pixel Bender Kernel Byte-code Format |
| PBL file extension | PowerBASIC, Inc. | PowerBASIC Library |
| PBPROJ file extension | N/A | Project Builder Project |
| PBQ file extension | Even Balance, Inc. | PunkBuster Query Script |
| PBXBTREE file extension | Apple | Apple Xcode Auto-complete Format |
| PBXPROJ file extension | Apple | Apple Project Builder Xcode Project File Format |
| PBXUSER file extension | Apple | Xcode Project User Data Format |
| PCH file extension | N/A | Microsoft Visual Studio Visual C++ Precompiled Header |
| PCP file extension | Microsoft | Windows Installer Patch Creation Process Format |
| PDE file extension | Processing | Processing Development Environment Source Code Format |
| PDL file extension | The PDL Team | Perl Data Language Format |
| PDM file extension | Microsoft | Microsoft Visual Basic Project Information Format |
| PDML file extension | N/A | Packet Details Markup Language |
| PERL file extension | The Software Group | Perl Source |
| PF0 file extension | SmartWare Corporation | SmartWare Project Source Code |
| PF1 file extension | SmartWare Corporation | SmartWare Project Source Code |
| PF2 file extension | SmartWare Corporation | SmartWare Project Source Code |
| PF4 file extension | SmartWare Corporation | SmartWare Project Source Code |
| PF? file extension | IBM | SmartWare Project Source |
| PFG file extension | Dave2 | JEEPersDX Configuration Format |
| PH file extension | N/A | Perl Header Format |
| PHP1 file extension | The PHP Group | PHP1 Auto |
| PHPS file extension | The PHP Group | PHP Script Source Code |
| PHPT file extension | The PHP Group | PHP Test Suite |
| PICKLE file extension | Python | Python Pickle Format |
| PIKA file extension | Pika Software | Pika Software Builder Project Format |
| PL file extension | N/A | Perl Script Language Source Code Format |
| PL1 file extension | IBM | PL/1 Programming Language Source Format |
| PLC file extension | Sunbelt | PL/B Source Format |
| PLE file extension | Patchou | Messenger Plus! Live Encrypted Log Format |
| PLG file extension | Microsoft | Microsoft Developer Studio Build Log Format |
| PLI file extension | IBM | PL/I Program Source Code Format |
| PLTSUITE file extension | Apple | Safari Page Load Test Suite Format |
| PM file extension | N/A | Perl Code Script Module |
| PMQ file extension | Microsoft | Windows Embedded Studio Target Analyzer Information Format |
| PNT file extension | The Panther Team | Panther Project Format |
| PO file extension | N/A | Portable Object Format |
| POC file extension | Poco Systems Inc | Pocomail PocoScript |
| POD file extension | N/A | Perl POD-formated Text |
| POLICY file extension | Opera Software ASA | Opera Policy |
| POM file extension | The Apache Project | Maven Build Format |
| POT file extension | N/A | Portable Object Format |
| POU file extension | M. Rehfeldt | PLCEdit Program Organisation Unit |
| PPL file extension | Free Pascal | Free Pascal Dynamic Library Format |
| PPU file extension | Free Pascal | Free Pascal Compiled Unit Format |
| PRG file extension | ABB | RAPID Program Format |
| PRI file extension | Nokia | Qt Project Include Format |
| PRL file extension | N/A | Perl Script |
| PRO file extension | Nokia | Profile Format |
| PROJECT file extension | Eclipse | Eclipse IDE Project Description Format |
| PROTO file extension | Google Protocol Buffers Buffer Format | |
| PSC2 file extension | Microsoft Corporation | Microsoft Windows PowerShell Script |
| PSD1 file extension | Microsoft | Microsoft Windows PowerShell Format |
| PSESS file extension | Microsoft | Microsoft Visual Studio Performance Session Format |
| PSL file extension | BMC Software, Inc. | PATROL Script Language Script |
| PSM1 file extension | Microsoft | Microsoft Windows PowerShell Script Module Format |
| PSML file extension | N/A | Packet Summary Markup Language |
| PSPSCRIPT file extension | Corel Corporation | Corel Paint Shop Pro Script |
| PTL file extension | IBM | Rational Rose Export/import Format |
| PTXML file extension | Microsoft Corporation | Microsoft Windows DLL XML Related |
| PTY file extension | IBM | IBM Rational Rose 98 Properties Format |
| PWN file extension | ITB CompuPhase | Pawn Source Code Format |
| PXD file extension | N/A | Pyrex Definition Format |
| PXML file extension | N/A | OpenPandora XML |
| PXT file extension | vellosoft | PEST - The Professional Exam System Quiz Script |
| PY file extension | N/A | Python Script Language Source Code |
| PYD file extension | N/A | Python Dynamic Module Format |
| PYM file extension | VRVis Research | PYM Python Preprocessor Macro Format |
| PYW file extension | N/A | Python GUI Source Script Format |
| PYX file extension | N/A | Pyrex Source Code Format |
| QCF file extension | Microsoft Corporation | Microsoft QBasic Coordinates |
| QLC file extension | Adobe Systems Incorporated | Adobe Type Manager ATM Type 1 Fonts Script |
| QPR file extension | N/A | FoxPro Database Query |
| QSC file extension | Synergy Software | Kaleidagraph Script |
| QX file extension | Tommesani | Quexal Source Code |
| R file extension | Apple | Apple Xcode Core Rez Program Format |
| RAKE file extension | Ruby community | Ruby Makefile |
| RAKEFILE file extension | Ruby community | Ruby Makefile |
| RAPC file extension | BlackBerry (Research In Motion Limited) | Java 2 ME Unit |
| RAV file extension | Nevrona Designs | Rave Reports Project Format |
| RB file extension | N/A | Ruby Script Format |
| RBC file extension | IBM | IBM Rembo-C Script Format |
| RBP file extension | REAL | REALbasic Project Format |
| RBVCP file extension | REAL Software | Real Studio Project Format |
| RBW file extension | N/A | Ruby |
| RBXS file extension | ROBLOX | ROBLOX Script |
| RC file extension | N/A | Microsoft Visual Studio Visual C/C++ Resource Script Format |
| RC2 file extension | Microsoft | Microsoft Visual Studio Visual C/C++ Non-compilable Resource Script Format |
| RC3 file extension | Microsoft Corporation | Visual C Resource |
| RDLC file extension | Microsoft | Microsoft Visual Studio Report Definition Format |
| RDOC file extension | James Britt | RubyDoc Script |
| RE file extension | N/A | Python Regular Expressions Source Code |
| REB file extension | REBOL Technologies | REBOL Script Format |
| REFRESH file extension | Microsoft | Microsoft Visual Studio Refresh Format |
| REJ file extension | N/A | Mercurial Reject |
| RES file extension | Borland | Microsoft C, C++ Compiled Resource Format |
| RESJSON file extension | Microsoft | Microsoft Windows 8 Metro JavaScript Format |
| RESOURCES file extension | Microsoft | Microsoft Visual Studio Resource Format |
| RESW file extension | Microsoft | Microsoft Windows 8 Resources Format |
| RESX file extension | Microsoft | Microsoft Visual Studio .NET XML Resource Template Format |
| RFS file extension | Next Limit Technologies | RealFlow Script |
| RFX file extension | Elegosoft | Modula M2SDS |
| RGUNINST file extension | RealNetworks, Inc. | RealArcade Uninstall Script |
| RH file extension | Microsoft Corporation | C++ Resource Header |
| RISE file extension | RISE to Bloome Software | RISE Information Model Format |
| RKT file extension | N/A | Racket Information Module |
| RLS file extension | Nokia | Symbian Localization Format |
| RMN file extension | Oracle Corporation | Oracle Recovery Manager Script |
| RNC file extension | N/A | RELAX NG Compact Syntax Format |
| RNW file extension | N/A | Sweave Source |
| ROB file extension | Taskware | Wintask Compiled Program |
| ROBO file extension | Arvid Halma | RoboMind Source Code |
| RODL file extension | RemObjects | RemObjects Definition Language Format |
| ROTEST file extension | RemObjects | RemObjects SDK Test Format |
| ROTESTRESULT file extension | RemObjects | RemObjects SDK Test Results Format |
| RPG file extension | Christopher Matthews | The RPG Programming Language |
| RPROFILE file extension | N/A | Quick-R R Programming Language Configuration |
| RPTPROJ file extension | Microsoft Corporation | Microsoft Visual Studio 2008 Report Project |
| RPY file extension | N/A | Python Script Format |
| RQY file extension | Microsoft Corporation | Microsoft Excel OLE DB Query |
| RRC file extension | BlackBerry (Research In Motion Limited) | BlackBerry Java Resource Content |
| RRH file extension | BlackBerry (Research In Motion Limited) | BlackBerry Resource Header |
| RS file extension | N/A | Rust Source Code Format |
| RSL file extension | N/A | Robot Scripting Language |
| RSRC file extension | N/A | MAC OS Resource Format |
| RSS file extension | Nokia | Symbian OS Application Resource Format |
| RSYM file extension | Graphisoft | ArchiCAD For Mac Geometric Description Language |
| RU file extension | N/A | JavaSoft JRE 1.3 Library |
| RUB file extension | The jQuery Foundation | JQuery Rules |
| RUL file extension | N/A | Rule Format |
| RULE file extension | Microsoft Corporation | Visual C++ Project Rules |
| RVB file extension | Robert McNeel & Associates | Rhinoceros 3D Visual Basic Script |
| RWSNIPPET file extension | Realmac Software | RapidWeaver Snippet Format |
| RXS file extension | Remedy Interactive, Inc. | RSIGuard RSIScript |
| S file extension | N/A | Source Code Format |
| S19 file extension | Motorola | Motorola EEPROM Programming Format |
| S2S file extension | CED | Spike2 Script |
| S43 file extension | Texas Instruments Inc. | IAR Assembly Source |
| S4E file extension | Ideaworks3D Limited | Airplay SDK Header |
| SAAS file extension | N/A | Sass Indented Syntax |
| SAL file extension | Oracle Corporation | SQL Application Language |
| SAS file extension | SAS Institute | SAS Source Code Format |
| SASS file extension | N/A | Syntactically Awesome Stylesheets Indented Syntax |
| SAX file extension | Tridium, Inc. | Sedona Framework XML Application |
| SB file extension | MIT | Scratch Finished Product Format |
| SBML file extension | N/A | Systems Biology Markup Language Source |
| SBPROJ file extension | Apple | OpenGL Shader Builder Project |
| SBR file extension | Microsoft | Microsoft Visual Studio Visual C++ Source Browser Intermediate Format |
| SC file extension | SuperCollider | SoundControl Audio Format |
| SCALA file extension | N/A | Scala Source |
| SCC file extension | Microsoft | Visual SourceSafe Control Format |
| SCONSTRUCT file extension | N/A | SCons Makefile |
| SCPTD file extension | Apple, Inc. | AppleScript Script Bundle |
| SCRATCH file extension | MIT | Scratch Project Format |
| SCRIPT EDITOR file extension | Apple, Inc. | Apple Mac OS X AppleScript Script |
| SCRIPTSUITE file extension | Apple | AppleScript Script Suite Format |
| SCRIPTTERMINOLOGY file extension | Apple | AppleScript Script Terminology Format |
| SCRO file extension | Visualization Sciences Group | Amira Script Object |
| SCSS file extension | N/A | Syntactically Awesome Stylesheets Syntax |
| SDEF file extension | Apple | AppleScript Dictionary Scripting Definition |
| SDL file extension | Microsoft | Web Service Description Language Format |
| SED file extension | The GNU Project | Sed Script |
| SEMAN file extension | The Eclipse Foundation | Xtext Semantics |
| SETUP file extension | Crytek | CryENGINE Character Format |
| SFM file extension | Kees Krijnen | SF Programming Language Main Source Code |
| SFR file extension | Kees Krijnen | SF Programming Language Repository |
| SH file extension | N/A | Unix Bourne Shell (Bash) Format |
| SHIT file extension | N/A | Bourne Shell Server Page |
| SIMPLE file extension | Simple developers | Simple Compiler Source Code |
| SJAVA file extension | EPFL | Synchronous Java Source Code Format |
| SJC file extension | SourceTec Software Co., LTD | Sothink JavaScript Web Scroller Definition |
| SJS file extension | Sebastien Pierre | Sugar Script |
| SLACKBUILD file extension | Slackware Linux, Inc. | Slackware Linux Script |
| SLIM file extension | N/A | Slim Script |
| SLL file extension | N/A | Static Link Library |
| SLN file extension | Microsoft | Microsoft Visual Studio Solution Format |
| SLOGO file extension | MIT | StarLogo Programming Project Format |
| SLOGT file extension | MIT | StarLogo Template Format |
| SLTNG file extension | MIT | StarLogo TNG Project Format |
| SMA file extension | N/A | AMX Mod Plugin Source Format |
| SMALI file extension | Google Android Smali Assembly Language Developer Format | |
| SMW file extension | Creston Electronics, Inc. | SIMPL Windows Source |
| SNAPX file extension | Snapform | Snapform XML Form |
| SNIPPET file extension | Microsoft | Microsoft Visual Studio Code Snippet Format |
| SO file extension | N/A | ELF Shared Library Format |
| SP? file extension | Terry A. Davis | LoseThos C+ Source |
| SPEC file extension | N/A | RPM Specification Format |
| SPT file extension | N/A | ESPL Programming Format |
| SQLDATAPROVIDER file extension | DotNetNuke Corp. | DotNetNuke Script |
| SQLJET file extension | The Eclipse Foundation | Eclipse JET SQL Template |
| SQLPROJ file extension | Microsoft | Microsoft Visual Studio SQL Server Project Format |
| SRC file extension | N/A | Generally Source Code Format |
| SRCRPM file extension | Red Hat | Red Hat Package Manager Source Format |
| SRZ file extension | The Database Managers, Inc. | DataFlex Source |
| SS file extension | SilverStripe | Scheme Source Code Format |
| SSC file extension | Microsoft | SourceSafe Status Format |
| SSI file extension | Adobe Systems | HTML With Server Side Includes |
| SSML file extension | N/A | Speech Synthesis Markup Language Source |
| STORYBOARD file extension | Apple | Interface Builder Storyboard Document |
| STYL file extension | Stylus team | Stylus CSS Script |
| SUD file extension | Aivosto | Super Project Analyzer Data Format |
| SUO file extension | Microsoft | Microsoft Visual Studio Solution User Options Format |
| SUP file extension | Aivosto | Super Project Definition Format |
| SUS file extension | Synergy Accounts | Synergy Accounts Update Script |
| SVN-BASE file extension | The Apache Project | Apache Subversion Base Format |
| SVO file extension | StatSoft, Inc. | STATISTICA Macro |
| SWC file extension | Adobe Systems | Adobe Flash Component Distribution Format |
| SWD file extension | Adobe Systems | Adobe Flash Debug Format |
| SWG file extension | N/A | SWAG Pascal Snippets (SWAG Reader) |
| SWIFT file extension | Apple, Inc. | Apple Swift Programming Language Source Code |
| SXS file extension | SAS Institute Inc. | SAS Stat Studio Module Source Code |
| SXV file extension | N/A | Action Repeater Macro |
| SYM file extension | N/A | Symbols Library Format |
| SYP file extension | N/A | SYP Source |
| T file extension | Holt Software | Turing Programming Language Format |
| TARGETS file extension | Microsoft | MSBuild Targets Format |
| TCC file extension | N/A | C++ Source Code Format |
| TCL file extension | N/A | TCL Script Source Code |
| TCSH file extension | The Open Group | Unix Shell Script |
| TDS file extension | Borland | Borland Turbo Debugger Symbol Table Format |
| TEA file extension | N/A | Tea Source |
| TEM file extension | Micro Focus International plc | Borland C++ Turbo Editor Macro Language Script |
| TESTRUNCONFIG file extension | Microsoft | Microsoft Visual Studio Test Run Configuration Format |
| TESTSETTINGS file extension | Microsoft | Microsoft Visual Studio Format |
| TEXINFO file extension | N/A | Texinfo Source |
| TEXTFACTORY file extension | Bare Bones Software | BBEdit Text Factory |
| TEXTILE file extension | Jason Garber | RedCloth Script |
| TGML file extension | N/A | Tecumseh Group Markup Language |
| TI file extension | timber-lang.org | Timber Compiler |
| TIKZ file extension | MathWorks, Inc. | Matlab Tikz Script |
| TILEMAP file extension | N/A | XML Tilemap Format |
| TIPROGRAM file extension | Texas Instruments | TI-Basic Source Code Format |
| TK file extension | N/A | Tk Language Script |
| TKP file extension | MicroImages, Inc. | MicroImages SML Script Standalone Application |
| TLD file extension | N/A | Tag Library Descriptor Format |
| TLH file extension | Microsoft | Typelib Generated C/C++ Header Format |
| TLI file extension | N/A | Typelib Generated C/C++ Inline Format |
| TMH file extension | Microsoft Corporation | Trace Message Header |
| TMLANGUAGE file extension | MacroMates | TextMate Grammar Format |
| TMPROJ file extension | MacroMates | TextMate Project Format |
| TMPROJECT file extension | MacroMates | TextMate Project |
| TNS file extension | Texas Instruments | TI-Nspire Document |
| TOKEND file extension | Apple, Inc. | Smart Card Support Mac |
| TPT file extension | PageTech | PCLTool Transformation Parameter Table |
| TPU file extension | Borland | Turbo Pascal Unit Format |
| TPX file extension | Borland | Turbo Pascal Unit Format |
| TQL file extension | Microsoft Corporation | Microsoft SQL Server Query Analyser Header |
| TRANSCRIPTSTYLE file extension | Apple, Inc. | Apple IChat Transcript Style |
| TRT file extension | Galactix Software | Team Sports Scheduling System Report Template |
| TRU file extension | True BASIC | True Basic Source |
| TRX file extension | Microsoft | Microsoft Visual Studio Test Results Format |
| TS0 file extension | N/A | Tio32 Script |
| TT file extension | Microsoft | Microsoft Visual Studio Text Template Format |
| TU file extension | Holt Software | Turing Source Code Format |
| TUR file extension | Holt Software | Turing Program Source Code Format |
| TURBOC3 file extension | Embarcadero Technologies, Inc. | Borland Turbo C Makefile |
| TWIG file extension | N/A | Twig Source |
| TXX file extension | Kitware, Inc. | Insight Segmentation And Registration Toolkit |
| UI file extension | Nokia | User Interface Format |
| UIT file extension | N/A | UIX XML Template |
| UIX file extension | Oracle Corporation | UiXML Page |
| ULP file extension | CadSoft Computer, Inc. | EAGLE Script |
| UML file extension | N/A | Visual UML Class Diagram & Model Format |
| UMLCLASS file extension | N/A | Java UML Class Model Format |
| UMP file extension | Altova | UModel Project |
| USI file extension | N/A | UsiXML UI Description |
| UVPROJ file extension | ARM Holdings plc | µVision4 Project |
| V file extension | Accellera | Verilog Source Code Format |
| V3S file extension | C-Motion, Inc. | Visual3D Pipeline |
| V4E file extension | Microsoft Corporation | Microsoft Windows Script Host |
| V4S file extension | Microsoft Corporation | Microsoft Windows Script Host |
| VAC file extension | N/A | Oc2.316s Cakit Format |
| VALA file extension | The GNOME Project | Vala Programming Language Source Code |
| VAR file extension | N/A | Variable Data |
| VBG file extension | N/A | Microsoft Visual Basic Compatible Project Group Format |
| VBI file extension | IntelliCAD Technology Consortium | IntelliCAD VBA Script |
| VBP file extension | Microsoft | Microsoft Visual Basic Project Format |
| VBPROJ file extension | Microsoft | Microsoft Visual Studio Visual Basic Project Format |
| VBX file extension | Microsoft | Microsoft Visual Basic Extension Format |
| VBZ file extension | N/A | Visual Basic Project Template Format |
| VC file extension | Verge | VisiCalc Spreadsheet Format |
| VC15 file extension | Microsoft Corporation | Microsoft Visual C 1.5 Make |
| VC2 file extension | Microsoft Corporation | Microsoft Visual C |
| VC4 file extension | Microsoft | Microsoft Visual C++ Makefile |
| VC5 file extension | Microsoft Corporation | Microsoft Visual C Make |
| VC7 file extension | N/A | Microsoft Visual C Makefile |
| VCP file extension | Microsoft | Microsoft Visual Studio Visual C++ Project Format |
| VCPROJ file extension | Microsoft | Microsoft Visual Studio Visual C++ Project Format |
| VCWIN32 file extension | Microsoft Corporation | Visual C Make |
| VCX file extension | N/A | FoxPro Visual Class Library Format |
| VCXPROJ file extension | Microsoft | Microsoft Visual Studio Visual C++ Project Format |
| VD file extension | N/A | PwrDev Visual Designer Project |
| VDDPROJ file extension | Microsoft Corporation | Microsoft Visual Studio Deployment Project |
| VDM file extension | VDM | VDM Specification Format |
| VDP file extension | Microsoft | Microsoft Visual Studio Deployment Project Format |
| VDPROJ file extension | Microsoft | Microsoft Visual Studio Visual C++ Deployment Project Format |
| VGC file extension | ViziGen | ViziGen Source Code Format |
| VHD file extension | N/A | Quartus II VHDL Design Format |
| VIC file extension | ViziGen | ViziGen Source Code Format |
| VIW file extension | Microsoft Corporation | Microsoft SQL Server View Script |
| VLS file extension | AIT | Visual Localize Script |
| VM file extension | Apache | Velocity Template Format |
| VPC file extension | ViziGen | ViziGen Source Code Format |
| VSL file extension | Apache | Velocity Template Format |
| VSMACROS file extension | Microsoft | Microsoft Visual Studio Binary-based Macro Project |
| VSMDI file extension | Microsoft | Microsoft Visual Studio Test Meta Data Format |
| VSMPROJ file extension | Microsoft | Microsoft Visual Studio Unicode Based Macro Project Format |
| VSPF file extension | Microsoft | Microsoft Visual Studio Performance Rules Format |
| VSPOLICY file extension | Microsoft Corporation | Microsoft Visual Studio Policy Description Language |
| VSPS file extension | Microsoft | Microsoft Visual Studio Profiling Data Analysed Report Format |
| VSPSCC file extension | Microsoft | Visual Studio Project Source Control Format |
| VSPX file extension | Microsoft | Visual Studio Performance Report Data Format |
| VSSSCC file extension | Microsoft | Visual Studio Solution Source Control Format |
| VSTEMPLATE file extension | Microsoft Corporation | Microsoft Visual Studio Project Template |
| VSZ file extension | Microsoft | Microsoft Visual Studio Launch Wizards Format |
| VTM file extension | Adobe Systems | Adobe ColdFusion Visual Tool Markup Language Query Format |
| VTML file extension | Adobe Systems | Adobe ColdFusion Visual Tool Markup Language Format |
| VTV file extension | Adobe Systems | Adobe Validator Document Format |
| W file extension | Progress Software | OpenEdge Architect Source Code Format |
| WBF file extension | Microsoft Corporation | Microsoft Windows Batch |
| WCH file extension | ALT- Advanced Logic Technology | WellCAD Header |
| WDGT file extension | Adobe Systems | Adobe Captivate Widget Format |
| WDGTPROJ file extension | Apple | Dashcode Widget Project |
| WDI file extension | PC SOFT | WINDEV Component Description |
| WDK file extension | PC SOFT | WINDEV Component |
| WDL file extension | Conitec Datasystems | World Definition Language Script |
| WDPROJ file extension | Microsoft Corporation | Microsoft Visual Studio Web Deployment Project |
| WDW file extension | PC SOFT | WINDEV Window Format |
| WDX9 file extension | Microsoft Corporation | Microsoft Word For Mac Wizard |
| WFS file extension | Microsoft Corporation | Microsoft Windows Installation Script |
| WID file extension | Microsoft | Visual Studio Widget Format |
| WIKI file extension | N/A | Wiki Markup Source |
| WIN32MANIFEST file extension | Microsoft Corporation | Microsoft Win32 Manifest |
| WIQ file extension | Microsoft | Microsoft Visual Studio Format |
| WIS file extension | Rocket Software, Inc. | IBM WIntegrate Basic Script |
| WIX file extension | Rocket Software, Inc. | WIntegrate Compiled Script |
| WIXOUT file extension | Microsoft Corporation | WiX XML Output |
| WMC file extension | Corel Corporation | Corel WordPerfect Macro |
| WMLC file extension | N/A | Wireless Markup Language Bytecode Document (WAP) |
| WMLS file extension | N/A | Wireless Markup Language Script File (WAP) |
| WMLSC file extension | N/A | Wireless Markup Language (WAP) Bytecode Script |
| WMW file extension | Likno Software Inc. | Likno Web Modal Windows Builder |
| WOD file extension | Apple, Inc. | Apple WebObjects Web Application Method |
| WORKSHEET file extension | Bare Bones Software | BBEdit Shell Worksheet Format |
| WOWPROJ file extension | AddOn Studio for World of Warcraft | AddOn Studio For World Of Warcraft Project Format |
| WSC file extension | Microsoft | Microsoft Windows Scripting Component Format |
| WSDD file extension | Apache Software Foundation | Apache Axis Web Service Deployment Descriptor (WSDD) |
| WSIL file extension | N/A | IBM Web Services Inspection Language |
| WSP file extension | Microsoft | Microsoft Windows SharePoint Services Solution Framework Format |
| WSYM file extension | Graphisoft | ArchiCAD For MAC Geometric Description Language |
| WXI file extension | Microsoft Corporation | WiX Include |
| WXL file extension | Microsoft Corporation | WiX Localization |
| WXS file extension | The Code::Blocks Team | Code::Blocks XML |
| WZS file extension | Microsoft Corporation | Microsoft Word Wizard |
| X file extension | N/A | Lex Language Source Code |
| XAML file extension | Microsoft | XAML Format |
| XAMLX file extension | Microsoft | Visual Studio Workflow Service Format |
| XAP file extension | Microsoft | XACT Project Format |
| XBD file extension | Oracle Corporation | JAXB Schema |
| XBLR file extension | N/A | Output Raw XBRL |
| XCAPPDATA file extension | Apple | Apple Xcode Application Data Format |
| XCARCHIVE file extension | Apple | Xcode Archive |
| XCDATAMODEL file extension | Apple | Xcode Core Data Model Format |
| XCDATAMODELD file extension | Apple | Xcode Core Data Model Format |
| XCL file extension | Jeffrey C Johnson (XTree Company) | XTree For Windows Script |
| XCODE file extension | N/A | Xcode Development Project Format |
| XCODEPROJ file extension | N/A | XCode Project Format |
| XCP file extension | Advanced Systems Concepts, Inc. | XLNT Script Command |
| XCSNAPSHOTS file extension | Apple | Xcode Snapshot |
| XCWORKSPACE file extension | Apple | Xcode Workspace Format |
| XDA file extension | Sencha Inc. | Sencha Architect Project |
| XFM file extension | Nuance Communications, Inc. | OmniForm XML |
| XIB file extension | Apple | Apple Interface Builder Format |
| XIG file extension | N/A | XML Instance Generator |
| XIN file extension | Stilo International plc | OmniMark Include |
| XJB file extension | Oracle Corporation | OEPE JAXB Wizard Bindings |
| XLM3 file extension | Microsoft Corporation | Microsoft Excel 3 For Mac Macro |
| XLM4 file extension | Microsoft Corporation | Microsoft Excel 4 For Mac Macro |
| XLM_ file extension | Microsoft Corporation | Microsoft Excel 2 For Mac Macro |
| XME file extension | ISIS / Vanderbilt University / School of Engineering | GME |
| XMLA file extension | N/A | XML For Analysis Source |
| XMLJET file extension | The Eclipse Foundation | Eclipse JET XML Template |
| XMTA file extension | Microsoft Corporation | Microsoft Visual Studio XMTA Document |
| XN file extension | Red Hat, Inc. | Cygnus Ld-scripts |
| XNF file extension | Satinmage | Extensible Numerical |
| XOJO_BINARY_PROJECT file extension | Xojo, Inc. | Xojo Binary Project |
| XOJO_PROJECT file extension | Xojo, Inc. | Xojo Programming Project |
| XOML file extension | N/A | Windows Workflow Format |
| XPB file extension | Tony D. Jones | XPB! Basic Source Code |
| XPGT file extension | Adobe Systems Incorporated | EPUB XML Stylesheet Page Template |
| XPP file extension | Microsoft | X++ Source Code Format |
| XQ file extension | The W3C XML Query Working Group | XQuery Format |
| XQL file extension | The W3C XML Query Working Group | XML Query Language Format |
| XQM file extension | The W3C XML Query Working Group | XQuery Module |
| XQUERY file extension | The W3C XML Query Working Group | XQuery Source Code Format |
| XQY file extension | The W3C XML Query Working Group | XQuery Source Format |
| XR file extension | Red Hat, Inc. | Cygnus Ld-scripts |
| XRC file extension | Adobe Systems Incorporated | WxWidgets WxPython Resource |
| XSD file extension | N/A | XML Schema Description Format |
| XSQL file extension | Oracle Corporation | Oracle XSQL Servlet Server Side |
| XSX file extension | Microsoft | Microsoft Visual Studio XML Schema Layout Format |
| XT file extension | N/A | Xdebug Trace Format |
| XTXT file extension | The Eclipse Foundation | Xtext |
| YAB file extension | Yabasic | Yabasic Source Code |
| YAJL file extension | lloyd | YAJL Script |
| YAML file extension | N/A | YAML Document |
| YML2 file extension | N/A | YML Script Format |
| YMP file extension | YaST | YaST Metapackage Format |
| YPR file extension | BYOB | BYOB Project Format |
| ZASM file extension | Xeno Innovations, Inc. | Zero Compiler Assembly Source |
| ZCLS file extension | Xeno Innovations, Inc. | Zero Compiler Class |
| ZERO file extension | Xeno Innovations, Inc. | Zero Compiler Project |
| ZFRM file extension | Xeno Innovations, Inc. | Zero Form Designer |
| ZFS file extension | Microsoft Corporation | C++ Assembly Source |
| ZH_TW file extension | AOL Inc. | Netscape Communicator Java Classes |
| ZPD file extension | Steven Pemberton | ABC Zeroadic Predicates |
| ZPK file extension | Zend Technologies Ltd. | Zend Studio Deployment Application Package |
| ZSC file extension | N/A | EditPad ZMUD Script |
| ZSH file extension | N/A | Unix Shell Script |
| ZSRC file extension | Xeno Innovations, Inc. | Zero Source |
| ZWS file extension | Zilog Inc. | ZiLOG Developer Studio Workspace |
| ~DF file extension | Embarcadero Technologies, Inc. | Delphi Form Backup |
| ~PA file extension | Embarcadero Technologies, Inc. | Delphi Pascal Backup |
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