File extension	The full name of the file	Popularity
File extension $01	MS-DOS pipe file
File extension 001	Multimedia Fusion Backup File
File extension 4DB	4th Dimension Database Structure File
File extension A	Static Library
File extension A2W	Alice World
File extension AB	Applix Builder File
File extension ABC	ActionScript Byte Code File
File extension ACD	RSLogix 5000 Program
File extension ACP	EditPlus Auto-Completion File
File extension ACT	DS Game Maker Action File
File extension ACTX	DS Game Maker Action Description File
File extension ADA	Ada Source Code
File extension ADB	Ada Body File
File extension ADDIN	Visual Studio Add-in Definition File
File extension ADS	Ada Specification File
File extension AGI	Asterisk Gateway Interface File
File extension ALB	Alpha Five Library
File extension AM	Automake Makefile Template
File extension AM4	AutoPlay Media Studio 4 Project File
File extension AM5	AutoPlay Media Studio 5 Project File
File extension AM6	AutoPlay Media Studio 6 Project
File extension AM7	AutoPlay Media Studio 7 Project
File extension AML	Arc Macro Language File
File extension ANE	Adobe AIR Native Extension
File extension ANJUTA	Anjuta IDE Project File
File extension APA	RSView Application Manager Archive
File extension APPLET	Eclipse Java Applet Policy File
File extension APPX	Windows 8 App Package
File extension APPXSYM	Windows 8 App Package Symbols File
File extension APPXUPLOAD	Windows 8 App Upload Package
File extension APR	Apadana Project File
File extension APS	Visual C++ Resource File
File extension AP_	ADT Android Developer Package
File extension ARR	MultiMedia Fusion Array File
File extension ARSC	Google Android resource file
File extension ART	Artifacts Artifact File
File extension ARTPROJ	Artifacts Project
File extension AS	ActionScript File
File extension AS2PROJ	FlashDevelop project file
File extension AS3PROJ	FlashDevelop ActionScript 3 Project File
File extension ASCS	ActionScript Communication Server File
File extension ASDB	Asphyre Sphinx Archive File
File extension ASI	Alpha Five Variable File
File extension ASM	Assembler source code file
File extension ASVF	Asphyre Sphinx Archive File
File extension AU3	AutoIt v3 Script
File extension AUT	AutoIt Script File
File extension AUTOPLAY	AutoPlay Media Studio Project File
File extension AWK	AWK Script
File extension AXE	Annotated XML Example File
File extension B	BASIC Source File
File extension BAS	BASIC Source Code File
File extension BASEX	BaseX Data File
File extension BB	Blitz Source Code File
File extension BBC	BBC BASIC Data File
File extension BBPROJECT	BBEdit Project File
File extension BBPROJECTD	BBEdit Project Document
File extension BCP	Borland C++ Makefile
File extension BDSPROJ	BDS project file
File extension BET	BETA Source File
File extension BPG	Borland Project Group
File extension BPL	Borland Package Library
File extension BPR	Borland C++Builder Project File
File extension BRX	BREW Application Resource File
File extension BS2	BASIC Stamp 2 Code File
File extension BSC	Visual Studio Source Browser Information File
File extension BSH	BeanShell Script
File extension BUILDPATH	Eclipse XML build path file
File extension BUR	BuRg3r Source Code File
File extension C	C/C++ Source Code File
File extension CAF	CryENGINE Character Animation File
File extension CAP	Construct Game Development File
File extension CAPROJ	Construct Project File
File extension CAPX	Construct Compressed Project File
File extension CAR	Brew Component Application Resource File
File extension CBA	CryENGINE Resource Compiler Settings File
File extension CBL	COBOL Source Code File
File extension CBP	Code::Blocks Project File
File extension CC	C++ Source Code File
File extension CCGAME	XNA Creators Club Game Package
File extension CCN	Multimedia Fusion development file
File extension CCSCC	ClearCase Source Control Info File
File extension CD	Visual Studio Class Diagram
File extension CDF	CryENGINE Character Definition File
File extension CDXML	Cmdlet Definition XML File
File extension CFC	ColdFusion Component File
File extension CHAM	Compiled HAM File
File extension CHEF	Chef Source Code File
File extension CI	PolySpace Preprocessed Code File
File extension CKBX	Cricket Audio XML Bank Description File
File extension CLASS	Java Class File
File extension CLIPS	Coda Clips File
File extension CLS	Program Class File
File extension CLW	Visual C++ ClassWizard File
File extension CMA	OCaml Library
File extension COB	COBOL Source Code File
File extension COD	Compiled Source Code
File extension CONFIG	Configuration File
File extension CP	Xcode C++ Source File
File extension CPB	Comicino Studio Project File
File extension CPP	C++ Source Code File
File extension CS	Visual C# Source Code File
File extension CSI	ContentServ Include File
File extension CSN	Adobe Code Snippet Document
File extension CSPROJ	Visual Studio C# Project
File extension CST	ContentServ Template
File extension CSX	Visual C# Script
File extension CTL	Visual Basic UserControl Object File
File extension CTP	CakePHP Template
File extension CTX	Visual Basic Control Binary File
File extension CTXT	BlueJ Context File
File extension CU	CUDA Source Code File
File extension CXP	CX-Programmer Project File
File extension CXT	CX-Programmer Project Text File
File extension CXX	C++ Source Code File
File extension D	D Source Code File
File extension DABRIEFCASE	RemObjects Data Abstract File Briefcase
File extension DACONFIG	RemObjects Data Abstract Configuration File
File extension DBA	DarkBASIC Source Code File
File extension DBML	Visual Studio OR Design File
File extension DBO	DarkBASIC Object
File extension DBPRO	DarkBASIC Professional Project File
File extension DBPROJ	Visual Studio Database Project File
File extension DCP	Delphi Compiled Package
File extension DCPROJ	Dashcode Project
File extension DCU	Delphi Compiled Unit
File extension DCUIL	Delphi .NET Compiled Unit File
File extension DDP	Delphi Diagram Portfolio File
File extension DEC	Declaration File
File extension DEF	Module-Definition File
File extension DEP	Windows Dependency File
File extension DEPEND	Code::Blocks Dependencies File
File extension DEV	Dev-C++ Project File
File extension DEVELOPERPROFILE	Xcode Developer Profile
File extension DEVICEIDS	Device Identification FIle
File extension DEX	Dalvik Executable File
File extension DF1	Omnis Native Datafile
File extension DFK	Dark Flow Project File
File extension DFM	Delphi Form
File extension DGML	Visual Studio Directed Graph Document
File extension DGSL	Visual Shader Graph File
File extension DIS	DisSharp Project File
File extension DM1	ER/Studio Data Model File
File extension DMD	SQL Developer Data Modeler File
File extension DOB	Visual Basic UserDocument
File extension DOCSET	Doxygen Document Set File
File extension DOX	Visual Basic Binary UserDocument
File extension DPK	Delphi Package
File extension DPKW	Delphi Package
File extension DPL	Delphi Package Library
File extension DPR	Delphi Project
File extension DPROJ	Delphi Project
File extension DRES	Delphi Compiled Resource File
File extension DRF	Delphi Resource File
File extension DSGM	DS Game Maker Project
File extension DSK	Borland Project Desktop File
File extension DSP	Visual C++ 6 Project
File extension DTD	Document Type Definition File
File extension DYLIB	Mach-O Dynamic Library
File extension ECP	EasyC Project File
File extension EDM	Adobe Extension Data Markup Language File
File extension EDML	Adobe Extension Data Markup Language Document
File extension EDMX	ADO.NET Entity Data Model Designer File
File extension EL	Emacs Lisp Code File
File extension ELC	Emacs Compiled Lisp File
File extension ENT	External Entity
File extension ENTITLEMENTS	Mac App Sandboxing Entitlements File
File extension EQL	Embedded SQL File
File extension ERB	Ruby ERB Script
File extension ERL	Erlang Source Code File
File extension EXL	JSDAI Inclusion or Exclusion List
File extension EXP	Symbols Export File
File extension EXW	Euphoria Source code File
File extension F	Fortran Source Code
File extension F90	Fortran 90 Source Code File
File extension FBP	wxFormBuilder Project
File extension FBP7	FinalBuilder 7 Project
File extension FBZ7	Compressed FinalBuilder 7 Project
File extension FD	DataFlex Data File
File extension FEATURE	SharePoint Feature File
File extension FGL	Fifth Generation Language Source File
File extension FILTERS	Visual C++ Project Filters File
File extension FIMPP	FiM++ Source Code File
File extension FLA	Adobe Flash Animation
File extension FOR	Fortran 77 Source File
File extension FPM	FPS Creator Map File
File extension FPP	Fortran Source Code
File extension FRAMEWORK	Mac OS X Application Framework
File extension FRJ	FreeForm-J Project File
File extension FRM	Visual Basic Text Form
File extension FRX	Visual Basic Binary Form File
File extension FS	Visual F# Source File
File extension FSI	Visual F# Signature File
File extension FSPROJ	Visual F# Project File
File extension FSSCRIPT	Visual F# Script
File extension FSX	Visual F# Script File
File extension FTL	FreeMarker Template File
File extension FTN	Fortran Source Code File
File extension FXC	FilePackager Configuration
File extension FXCPROJ	FX Composer Project File
File extension FXL	FaceFX Language File
File extension FXPL	Adobe Flash FXP Library
File extension GAMEPROJ	GameSalad Project File
File extension GAR	GridGain Archive
File extension GBAP	GLBasic Project File
File extension GBAS	GLBasic Source File
File extension GDFMAKERPROJECT	GDF Editor Project File
File extension GED	Game Editor Project File
File extension GEMSPEC	Gem Specification File
File extension GITIGNORE	Git Ignore File
File extension GLADE	Glade Project File
File extension GLD	MPLAB C Compiler Linker Script File
File extension GLOBAL	Global Makefile
File extension GLS	GLScript Game Script
File extension GM	GameMonkey Script
File extension GM6	Game Maker 6 Project File
File extension GM81	Game Maker 8.1 Project File
File extension GMD	Game Maker Program Code
File extension GMK	Game Maker Project File
File extension GML	Game Maker Language File
File extension GMO	GNU Machine Object File
File extension GNUMAKEFILE	GNU Makefile
File extension GORM	Gorm Interface Resource File
File extension GPJ	MULTI IDE Project File
File extension GROOVY	Groovy Source Code File
File extension GROUPPROJ	Delphi Project Group File
File extension GS	Google Apps Script
File extension GS3	GameStarter File
File extension GSPROJ	GameSalad Windows Project File
File extension GSZIP	GameSalad Marketplace Asset File
File extension GVY	Groovy Source Code File
File extension H	C/C++/Objective-C Header File
File extension HAL	HansaWorld Application Language File
File extension HAS	Haskell Script
File extension HCF	Compact Ham Library
File extension HH	C++ Header File
File extension HHH	Power C Precompiled Header File
File extension HPF	High Performance Fortran File
File extension HPP	C++ Header File
File extension HRL	Erlang Header File
File extension HS	Haskell Script
File extension HXX	C++ Source Code Header File
File extension HYDRA	Hydra Image Filter Program File
File extension I	Visual Studio Intermediate File
File extension IDB	Visual Studio Intermediate Debug File
File extension IDE	Borland C++ Project file
File extension IDL	Interface Definition Language File
File extension IDT	Windows Installer Database Text Archive File
File extension ILK	Incremental Linking File
File extension IML	IntelliJ IDEA Module
File extension INC	Include File
File extension INL	C++ Inline File
File extension IPCH	Intellisense Precompiled Header File
File extension IPP	Inline Guard Macro File
File extension ISC	Xilinx Device Configuration File
File extension ISE	InstallShield Express Project File
File extension IWZ	InstallShield Express 2 Project File
File extension J	Java Source File
File extension JAV	Java Source File
File extension JAVA	Java Source Code File
File extension JED	Xilinx JEDEC Programming File
File extension JIC	JTAG Indirect Configuration File
File extension JL	Julia Source Code File
File extension JNILIB	JNI Library
File extension JPD	Java Process Definition
File extension JPR	JBuilder Project
File extension JPX	JBuilder Project
File extension JSFL	Flash JavaScript File
File extension JSH	JAWS Script Header File
File extension JSPF	Java Server Page Fragment
File extension JSS	JAWS Script
File extension JSXINC	ExtendScript Included Script File
File extension KB	C++ Keyboard Script
File extension KDEVDLG	KDevelop Dialog Box File
File extension KDEVELOP	KDevelop Project Data File
File extension KDEVPRJ	KDevelop Project File
File extension KDMP	Windows Crash Dump File
File extension L	Lex Source File
File extension LBI	Dreamweaver Library Item
File extension LBS	Omnis Library
File extension LDS	Binutils LD Linker Script
File extension LGO	Logo Instructions File
File extension LHS	Literate Haskell Script
File extension LICENSES	Visual Studio Licensed Classes File
File extension LICX	Visual Studio License File
File extension LIS	VAX Program Listing
File extension LISP	Lisp Source Code File
File extension LIST	JAR Index File
File extension LIT	Literate Haskell Script
File extension LNT	PC-lint/FlexeLint Configuration File
File extension LOL	LOLCODE Source Code FIle
File extension LPROJ	Localized Project Folder
File extension LRDB	Photoshop Lightroom Database
File extension LRF	Microsoft Linker Response File
File extension LSP	Lisp Program Source Code File
File extension LSPROJ	Visual Studio LightSwitch Project
File extension LUA	Lua Source File
File extension LXSPROJ	Liquid XML Studio Project File
File extension M	Objective-C Implementation File
File extension M4	Macro Processor Library
File extension MAGIK	Magik Source Code File
File extension MAK	Makefile
File extension MAKE	Xcode Makefile Script
File extension MAKEFILE	Makefile
File extension MAKO	Mako Template
File extension MARKDN	Markdown File
File extension MARKDOWN	Markdown Documentation File
File extension MD	Markdown Documentation File
File extension MDOWN	Markdown File
File extension MDZIP	MagicDraw Project Archive
File extension MED	RSView Development Project
File extension MF	Java Manifest File
File extension MFA	Multimedia Fusion Development File
File extension MFCRIBBON-MS	MFC Ribbon Definition XML File
File extension MK	Makefile
File extension ML	ML Source Code File
File extension MLB	Visual FoxPro Library
File extension MM	Objective-C++ Source File
File extension MO	Machine Object File
File extension MOD	Fortran Module File
File extension MOM	Managed Object Model
File extension MPR	FoxPro Generated Menu Program
File extension MSHA	Microsoft Help Asset File
File extension MSHC	Microsoft Help Container File
File extension MSHI	Microsoft Help Index File
File extension MSP	MaxScript Page File
File extension MVX	Multimedia Fusion Movement Extension
File extension MXML	Flex MXML Component
File extension MYAPP	Visual Studio Application XML File
File extension NB0	Google Android compiled ROM file
File extension NBC	Next Byte Codes Source Code File
File extension NCB	Visual C++ IntelliSense Database
File extension NED	OMNeT++ Network Description File
File extension NEKO	Neko Source Code File
File extension NFM	Delphi .NET Form File
File extension NIB	Interface Builder User Interface File
File extension NIM	Nimrod Source Code File
File extension NK	NUKE Script
File extension NLS	NetLogo Source File
File extension NQC	Not Quite C Source Code File
File extension NSH	NSIS Header File
File extension NSI	NSIS Script
File extension NUPKG	NuGet Package
File extension NUSPEC	NuGet Specification File
File extension NXC	Not eXactly C Source Code File
File extension O	Compiled Object File
File extension OCA	Custom Control Library Type File
File extension OCTEST	Xcode Objective-C Unit Test Bundle
File extension OCX	ActiveX Control
File extension ODL	Object Description Language File
File extension OMO	OMake Object File
File extension ORDEREDTEST	Visual Studio Ordered Test File
File extension OS	ObjectScript Source File
File extension OSC	Obix Source Code File
File extension OW	Free Pascal 1.0.x Object File
File extension OWL	OWL Source Code File
File extension OXYGENE	Oxygene Project File
File extension P	Pascal Source Code
File extension P3D	Panda3D Multifile
File extension P6	Perl 6 Source Code File
File extension PAS	Pascal Source File
File extension PB	PureBasic Source File
File extension PBG	Pixel Bender Graph File
File extension PBJ	Pixel Bender Bytecode File
File extension PBK	Pixel Bender Kernel File
File extension PBPROJ	Project Builder Project
File extension PBXBTREE	Xcode Auto-Complete File
File extension PBXPROJ	Xcode Project Data File
File extension PBXUSER	Xcode Project User Data File
File extension PC	Pro*C Source Code File
File extension PCH	Precompiled Header File
File extension PCP	Windows Installer Patch Creation Properties File
File extension PDE	Processing Development Environment Source Code File
File extension PDM	VB Project Information File
File extension PFG	jEEPers Program Configuration File
File extension PGX	Visual Basic binary property page file
File extension PH	Perl Header File
File extension PICKLE	Python Pickle File
File extension PIKA	Pika Software Builder Project File
File extension PJX	FoxPro Project
File extension PL	Perl Script
File extension PL1	PL/I Source Code
File extension PLC	PL/B Source File
File extension PLE	Messenger Plus! Live Encrypted Log File
File extension PLI	PL/I Source Code File
File extension PLTSUITE	Safari Page Load Test Suite File
File extension PM	Perl Module
File extension PMQ	Microsoft Target Analyzer File
File extension PNT	Panther Project
File extension PO	Portable Object
File extension POD	Perl POD File
File extension POM	Maven Build File
File extension POT	Portable Object File
File extension PPC	Mobile Data Studio Project File
File extension PPL	Free Pascal Dynamic Library
File extension PPU	Free Pascal Unit File
File extension PRG	Visual FoxPro Program File
File extension PRI	Qt Project Include File
File extension PROJECT	Eclipse Project Settings File
File extension PROTO	Protocol Buffer File
File extension PSD1	Windows PowerShell Data File
File extension PSESS	Visual Studio Performance Session File
File extension PSM1	Windows PowerShell Script Module File
File extension PTL	Python template language file
File extension PTY	Rational Property Set
File extension PWN	Pawn Source Code File
File extension PXD	Pyrex Definition File
File extension PXI	Pyrex Include File
File extension PY	Python Script
File extension PYD	Python Dynamic Module
File extension PYM	PYM Macro Preprocessor File
File extension PYW	Python GUI Source File
File extension PYX	Pyrex Source Code File
File extension QPR	FoxPro Generated Query Program
File extension QX	Quexal Source Code
File extension R	Rez Source Code File
File extension RB	Ruby Source Code
File extension RBC	Rembo-C Script
File extension RBP	Real Studio Project File
File extension RBVCP	Real Studio Version Controlled Project
File extension RBXS	ROBLOX Script
File extension RC	Resource Script
File extension RC2	Visual Studio Resources File
File extension RDLC	Visual Studio Client Report Definition File
File extension REB	REBOL Script File
File extension REFRESH	Visual Studio Refresh File
File extension RES	C++ Complied Resource Script
File extension RESJSON	Windows JavaScript Resources File
File extension RESOURCES	Visual Studio Resource File
File extension RESW	Windows Resources File
File extension RESX	.NET Managed Resources File
File extension RISE	RISE Editor Model File
File extension RNC	RELAX NG Compact Syntax File
File extension RODL	RemObjects Definition Language File
File extension ROTEST	RemObjects SDK Test File
File extension ROTESTRESULT	RemObjects SDK Test Results File
File extension RPY	Python Script
File extension RS	Rust Source Code File
File extension RSRC	Macintosh Resource File
File extension RSS	Symbian Application Resource File
File extension RU	Java Russian Font Properties File
File extension RUL	InstallShield Rules File
File extension RWS	Borland C++ resource workshop symbol file
File extension RWSNIPPET	RapidWeaver Snippet File
File extension S	Source Code File
File extension S19	Motorola S19 File Record
File extension SAS	SAS Program File
File extension SB	Scratch Project File
File extension SBPROJ	OpenGL Shader Builder Project
File extension SBR	Visual Studio Source Browser Intermediate File
File extension SCC	SourceSafe Source Code Control File
File extension SCRATCH	Scratch Project File
File extension SCRIPTSUITE	AppleScript Script Suite File
File extension SCRIPTTERMINOLOGY	AppleScript Script Terminology File
File extension SDEF	AppleScript Dictionary Document
File extension SDL	Service Description Language File
File extension SED	Sed Script
File extension SETUP	CryENGINE Character Setup File
File extension SH	Bash Shell Script
File extension SJAVA	Synchronous Java File
File extension SLL	Static Link Library
File extension SLN	Visual Studio Solution File
File extension SLOGO	StarLogo Project File
File extension SLOGT	StarLogo Project Template
File extension SLTNG	StarLogo TNG Project File
File extension SMA	AMX Mod Plugin Source File
File extension SMALI	Android Smali Assembly Language File
File extension SMF	SkinMagic C/C++ Toolkit File
File extension SML	ARC/INFO Simple Macro Language File
File extension SNIPPET	Visual Studio IntelliSense Code Snippet
File extension SPEC	RPM Specification File
File extension SPT	ESPL Programming File
File extension SQLPROJ	Visual Studio SQL Server Project
File extension SRC	Source Code
File extension SRCRPM	Red Hat Package Manager Source File
File extension SSC	SourceSafe Status File
File extension SSI	Adobe Dreamweaver Server Side Include File
File extension STORYBOARD	Interface Builder Storyboard Document
File extension SUD	Super Project Analyzer File
File extension SUO	Visual Studio Solution User Options File
File extension SUP	Super Project Definition File
File extension SVN-BASE	Subversion Base File
File extension SWC	Flex Components Archive
File extension SWD	Flash Debug File
File extension SYM	Symbols File
File extension T	Turing Source Code File
File extension TARGETS	MSBuild Targets File
File extension TCC	C++ Source Code File
File extension TCL	Tcl Script
File extension TDS	Borland Turbo Debugger symbol table file
File extension TESTRUNCONFIG	Visual Studio Test Run Configuration File
File extension TESTSETTINGS	Visual Studio Test Settings File
File extension TEXTFACTORY	BBEdit Text Factory
File extension TIPROGRAM	TI-Basic Program File
File extension TK	Tk Script
File extension TLD	Tag Library Descriptor File
File extension TLH	Typelib Generated C/C++ Header File
File extension TLI	Typelib Generated C/C++ Inline File
File extension TMLANGUAGE	TextMate Language Grammar File
File extension TMPROJ	TextMate Project File
File extension TMPROJECT	TextMate Project
File extension TNS	TI-Nspire Document
File extension TPU	Turbo Pascal Unit
File extension TPX	Turbo Pascal 7 Unit
File extension TRX	Visual Studio Test Results File
File extension TT	Visual Studio Text Template
File extension TU	Turing Source File
File extension TUR	Turing Program Source File
File extension UI	User Interface File
File extension UML	UML Data Object Model
File extension UMLCLASS	UML Class Model
File extension V	Verilog Source Code File
File extension VAC	Oc2.316s Cakit File
File extension VALA	Vala Source Code File
File extension VAR	Variable Data
File extension VBG	Visual Basic Project Group File
File extension VBP	Visual Basic Project File
File extension VBPROJ	Visual Studio Visual Basic Project
File extension VBX	Visual Basic Custom Control
File extension VBZ	Visual Basic Project Template
File extension VC	Verge Code File
File extension VC4	Visual C++ 4 File
File extension VCP	eMbedded Visual C++ Project File
File extension VCPROJ	Visual C++ Project File
File extension VCX	Visual Fox Pro Class Library
File extension VCXPROJ	Visual C++ Project
File extension VDM	VDM Specification File
File extension VDP	Visual Studio Deployment Project
File extension VDPROJ	Visual Studio Setup and Deployment Project
File extension VGC	ViziGen Code Generation Template
File extension VHD	VHDL Source File
File extension VIC	ViziGen Code Import Mappings File
File extension VM	Velocity Template
File extension VPC	ViziGen Configuration File
File extension VSL	Velocity Template File
File extension VSMACROS	Visual Studio Binary Macro Project
File extension VSMDI	Visual Studio Test Metadata File
File extension VSMPROJ	Visual Studio Text Macro Project
File extension VSP	Visual Studio Performance Report File
File extension VSPF	Visual Studio Performance Filter File
File extension VSPS	Visual Studio Serialized Performance Report
File extension VSPSCC	Visual Studio Project Source Control File
File extension VSPX	Visual Studio Performance Report Data File
File extension VSSSCC	Visual Studio Solution Source Control File
File extension VSZ	Visual Studio Wizard File
File extension VTM	Visual Tool Markup Language Document
File extension VTML	Visual Tool Markup Language File
File extension VTV	Adobe Dreamweaver Validator Configuration File
File extension W	OpenEdge Architect Source Code File
File extension W32	Win32 Makefile
File extension WDGT	Adobe Captivate Widget File
File extension WDGTPROJ	Dashcode Widget Project
File extension WDL	World Definition Language Script
File extension WDP	Windev Project File
File extension WDW	WinDev Window File
File extension WID	Visual Studio Widget File
File extension WIQ	Visual Studio Work Item Query File
File extension WORKSHEET	BBEdit Shell Worksheet File
File extension WOWPROJ	AddOn Studio Project File
File extension WSC	Windows Script Component
File extension WSP	SharePoint Solution Package
File extension X	Lex Source Code File
File extension XAML	Windows Markup File
File extension XAP	XACT Project
File extension XCAPPDATA	Xcode App Data File
File extension XCARCHIVE	Xcode Archive
File extension XCDATAMODEL	Xcode Core Data Model File
File extension XCDATAMODELD	Xcode Core Data Model File
File extension XCODE	Xcode Project
File extension XCODEPROJ	Xcode Project
File extension XCSNAPSHOTS	Xcode Snapshot
File extension XCWORKSPACE	Xcode Workspace File
File extension XIB	Interface Builder File
File extension XOML	Windows Workflow File
File extension XPP	X++ Source Code File
File extension XQ	XQuery File
File extension XQL	XML Query Language File
File extension XQM	XQuery Module
File extension XQUERY	XQuery Source Code File
File extension XQY	XQuery Source File
File extension XSD	XML Schema Definition
File extension XSX	Visual Studio XML Schema Layout File
File extension XT	Xdebug Trace File
File extension Y	Yacc Source File
File extension YAB	Yabasic Source Code
File extension YAML	YAML Document
File extension YML	YAML Document
File extension YML2	YML Script
File extension YMP	YaST Metapackage File
File extension YPR	BYOB Project File