Data File Types

Data files are the most common type of computer files. They may be installed with applications or created by users. Most data files are saved in a binary format, though some store data as plain text. Examples of data files include libraries, project files, and saved documents.

NOTE: The Data Files category encompasses other more specific categories. File types that do not fit within these subcategories are placed in this category.

Common data file extensions include .DAT, .XML, and .VCF.

Extension	File Description		Popularity
.1pe	TurboTax Form File		Average
.1ph	TurboTax File		Average
.3dr	3DMark Results File		Common
.3dr	3D Rad Project File		Average
.3dt	3D Topicscape File		Average
.3me	TurboTax Form File		Uncommon
.3pe	TurboTax 2008 Form File		Uncommon
.4dv	4D View Ultrasound File		Average
.8xg	TI-83/84 Plus Group File		Uncommon
.8xk	TI-83 Plus Application Upgrade File		Uncommon
.8xs	TI-83/84 Plus String File		Rare
.8xv	TI-83/84 Plus Variable File		Uncommon
.a3l	Authorware 3 Library		Rare
.a3m	Authorware 3 Macintosh File		Rare
.a3w	Authorware 3 Windows File		Rare
.a4l	Authorware 4 Library		Rare
.a4m	Authorware 4 Macintosh File		Rare
.a4w	Authorware 4 Windows File		Rare
.a5l	Authorware 5 Library		Uncommon
.a5w	Authorware 5 Windows File		Uncommon
.a65	Authorware 6.5 File		Uncommon
.aam	Authorware Map File		Average
.aao	Agenda At Once File		Uncommon
.ab	DNA Sequence File		Average
.ab1	DNA Electropherogram File		Average
.ab2	Print Shop Address Book File		Uncommon
.ab3	PhotoImpact 3 Album File		Average
.abcd	AudioVisual Book Data File		Average
.abdata	Adobe Bridge Data File		Uncommon
.abi	DNA Chromatogram File		Average
.abkprj	Ashampoo Backup Project		Average
.abp	AVS Barcode Profile		Average
.aby	AOL Address Book File		Average
.aca	Agent Character Animation File		Uncommon
.acc	Graphics Accounts Data File		Average
.acf	Agent Character Data File		Uncommon
.acg	Agent Preview File		Uncommon
.ade	Access Project Extension		Average
.adp	Access Project		Average
.adt	ACT! Document Template		Common
.adx	Approach Index File		Average
.aft	Ancestry.com Family Tree Database		Average
.agd	AgileGraph Data File		Uncommon
.aggr	Adobe Captivate Aggregate File		Average
.aifb	AIF Builder Project File		Average
.alc	Dynamics AX Label Description File		Average
.ald	Dynamics AX Application Label Data File		Average
.ali	Dynamics AX Label Index File		Average
.amb	AIMMS Model File		Average
.amsorm	OnLine Ringman Auction Client File		Average
.amu	PictureGear Studio Photo Album File		Rare
.an1	Street Atlas USA Draw File		Uncommon
.anme	Anime Studio Project		Common
.arc	Nintendo Archive File		Rare
.arh	ArheoStratigraf Project File		Rare
.ashprj	Ashampoo Burning Studio Project		Average
.asm	Pro/ENGINEER Assembly File		Uncommon
.asnd	Adobe Sound Document		Average
.asr	Adobe Photoshop Scratch File		Rare
.ast	ClarisWorks Assistant File		Uncommon
.avc	Kaspersky Virus Database		Average
.avenirproj	StoryMill Project		Uncommon
.aw	Answer Wizard File		Common
.awdb	Access Walker Database File		Average
.awg	Activeworlds Object Group File		Average
.azw	Amazon Kindle eBook File		Common
.azw1	Amazon Topaz eBook		Common
.azz	AZZ Cardfile Database File		Uncommon
.bafl	BurnAware File List		Uncommon
.bar	Brew MP Binary Application Resource File		Uncommon
.bc	Adobe Bridge Cache File		Uncommon
.bcc	Calendar Creator File		Average
.bci	Belarc Advisor Report File		Average
.bcm	Business Contact Manager File		Average
.bct	Adobe Bridge Thumbnail Cache File		Uncommon
.bdc	Babylon Dictionary File		Average
.bdf	Binary Data File		Uncommon
.bdic	Chrome Dictionary File		Average
.bfx	Bitware Fax Document		Uncommon
.bgl	Babylon Glossary File		Common
.bgt	Graphics Accounts Data File		Average
.bim	Bytessence InstallMaker Document		Uncommon
.bin	Generic Binary File		Average
.bjo	TablEdit Tablature File		Uncommon
.bk	FrameMaker Book File		Average
.bkk	BookBuddi eBook File		Average
.blb	Blob Data File		Average
.bld	Envisioneer Building Project File		Common
.blg	Windows Binary Performance Log File		Common
.blg	BibTeX Log File		Average
.bm2	Boardmaker Interactive Board File		Uncommon
.bok	TestGen Testbank File		Average
.book	Budget In Brief Book File		Uncommon
.box	E-mail Mailbox		Average
.brain	PersonalBrain Mind Map File		Average
.brd	EAGLE Circuit Board File		Average
.brw	Calyx Point Borrower File		Average
.btf	NationsBank Check Images		Uncommon
.btif	NationsBank Check Image File		Rare
.btm	BizTalk Map File		Average
.bvp	VodaHost BlueVoda Project File		Common
.caf	Class Action Gradebook File		Average
.cap	Packet Capture File		Average
.cav	Comodo Virus Definitions File		Average
.cbg	CyberGauge Data File		Average
.cca	Multimedia Fusion File		Average
.cca	cc:Mail Archive File		Uncommon
.cch	Corel Chart File		Average
.ccp	RIB Import Converter Profile		Uncommon
.ccr	ASTM Continuity of Care Record		Average
.cct	Director Protected Cast Resource		Uncommon
.cdf	Content Definition File		Common
.cdf	Common Data Format		Uncommon
.cdf	Nominal Small Business Accounting Company Data File		Uncommon
.cdp	ConceptDraw PROJECT File		Uncommon
.cdp	CD/Spectrum Pro File		Uncommon
.cdpx	ConceptDraw PROJECT XML File		Uncommon
.cdpz	ConceptDraw PROJECT Document		Average
.cdr	Crash Data Retrieval Data File		Rare
.cdx	Compound Index File		Average
.cel	Battery 3 Drum Cell File		Average
.celtx	Celtx Project File		Average
.cfs	CFS Console File		Rare
.chg	Quicken Online Data File		Average
.chk	InterCheck Checksum Database		Uncommon
.chn	Ethnograph Data		Average
.ckt	CircuitMaker File		Average
.cl2	HY-TEK Meet Results File		Uncommon
.cl4	Easy CD Creator 4 Project File		Uncommon
.classlist	SMART Notebook Class List File		Average
.clb	ICQ Contact List		Uncommon
.clg	Collage Maker Project File		Average
.clix	CLIX Command File		Uncommon
.clk	Corel R.A.V.E Project File		Average
.clm	GenePattern CEL Descriptor File		Rare
.clm	MagicJack Call Log File		Average
.clp	Windows Clipboard File		Average
.clx	Standard Dictionary File		Average
.cmap	CmapTools Concept Map File		Average
.cmbl	Logger Pro Data File		Uncommon
.cml	Chemical Markup Language File		Average
.cn1	CNR Modem Initialization Data File		Rare
.cna	Catena Project File		Average
.collection	Adobe Bridge Collection File		Uncommon
.contact	Windows Contact File		Common
.cor	Trimble Corrected SSF File		Average
.cpmz	Miradi/ConPro Project File		Uncommon
.cptl	Adobe Captivate Project Template File		Uncommon
.cptx	Adobe Captivate Project File		Average
.crev	Adobe Captivate Commentable SWF File		Average
.crtx	Office 2007 Chart Template File		Average
.cry	CryENGINE Map File		Average
.csa	PNA Code Calset File		Average
.csv	Comma Separated Values File		Very Common
.ctf	WhereIsIt Catalog		Average
.ctl	StepMania SMZIP Package Description File		Uncommon
.ctm	CrazyTalk Model File		Average
.ctt	Messenger Contact List		Average
.cursorfx	CursorFX Theme File		Average
.curxptheme	CursorXP Theme File		Average
.cva	Canvas Sequence Set		Average
.cvd	ClamAV Virus Definitions File		Average
.cvn	CineVision Encoding Session		Average
.cwk	ClarisWorks Document		Average
.cwz	Circuit Wizard File		Uncommon
.cxt	Director Protected Cast File		Rare
.cyo	Clustify Output File		Average
.cys	Clustify Summary File		Average
.da2	DeepAnalysis Save File		Uncommon
.daf	Digital Anchor File		Uncommon
.dal	DVD-lab Project File		Average
.dam	DeltaMaster Analysis Model		Average
.das	DeltaMaster Analysis Session		Average
.dat	Data File		Very Common
.data	Analysis Studio Offline Data File		Uncommon
.db-	Norton Nprotect Database File		Rare
.dbd	DemoShield Project		Average
.dbf	FoxPro Table		Average
.dbgsym	Debug Symbols File		Uncommon
.dcf	Document Computation Format		Average
.dcl	DumpSec Report File		Uncommon
.dcm	DiskCatalogMaker Catalog File		Average
.dcmd	DiskCatalogMaker Thumbnail-Enabled Catalog		Average
.dcpf	Disc Copier Project File		Uncommon
.dcpr	Adobe DNG Camera Profile Recipe File		Average
.dct	AutoCAD Dictionary File		Uncommon
.ddc	DivX Descriptor File		Average
.ddcx	DivX Descriptor 2 File		Average
.ddt	Diagram Designer Template		Uncommon
.des	QuickBooks Forms Template		Average
.dex	DEXIS Digital X-ray File		Uncommon
.dfm	Midas ViewPoint Display Form		Average
.dfproj	DVD Flick Project		Average
.dgs	3D Screen Creator Scene File		Uncommon
.dhcd	DHCD Computing Application Data File		Uncommon
.dia	Do It Again Task File		Uncommon
.dif	Data Interchange Format		Common
.dii	Summation Batch Load File		Average
.djm	Dynojet Map File		Uncommon
.dm2	Toad Data Modeler 2 File		Average
.dmc	Datamartist Data Canvas File		Uncommon
.dmo	Movienizer Database File		Uncommon
.dmo	Derive Demo		Uncommon
.dmsk	DivX Temporary Video Data File		Uncommon
.dmsp	PhotoSuite Project File		Common
.dnc	Dance Database File		Rare
.dockzip	ObjectDock File		Average
.dpn	Depiction Data File		Average
.dpx	VASCO DIGIPASS File		Uncommon
.drl	Gerber Drill Rack File		Average
.dsb	Orchida Embroidery File		Average
.dsd	Diet Studio Data File		Uncommon
.dsx	Diet Studio XML File		Uncommon
.dsy	Directory Synchronizer Project File		Average
.dsz	Orchida (OES) Embroidery File		Average
.dta	Chain Engineering Database		Rare
.dtd	Design Tools Draw File		Uncommon
.dtr	DATroniC Data Recording		Average
.dvdproj	iDVD Project File		Average
.dvds	DVDStyler Project File		Average
.dvo	Cook'n Cookbook File		Average
.dwi	Dance With Intensity Song File		Average
.dwp	DarkWave Studio Project File		Uncommon
.dws	Adobe Dreamweaver Site Cache File		Average
.dwz	DVD MovieFactory Project File		Uncommon
.eap	Enterprise Architect Project		Average
.eas	RSLogix Symbol File		Uncommon
.ebuild	Portage eBuild Script		Average
.ec0	MetroCount Traffic Data File		Uncommon
.ecl	Management-Ware Mass Mailing News E-Campaign List		Average
.edf	ESRF Data File		Uncommon
.edf	Estimator Data File		Average
.edfx	Estimator.NET Estimate File		Uncommon
.eep	EEPROM Data File		Rare
.efp	Exchange Forms Designer Template		Average
.efx	eFax Document		Very Common
.egp	Easy Grade Pro Gradebook File		Average
.emb	Everest Embedded Bank File		Average
.emb	Embroidery Design File		Average
.emd	ChessBase Tablebase		Average
.emlxpart	Mail Message Attachment		Average
.enc	Electronic Navigation Chart File		Uncommon
.env	Adobe Dictionary Data File		Uncommon
.enw	EndNote Citation File		Uncommon
.epf	Edgecam Educational Part File		Average
.epp	TalaPhoto Project		Uncommon
.epp	Efficient PPC Project File		Uncommon
.epub	Open eBook File		Common
.epw	EnergyPlus Weather Data File		Common
.er1	ERWin Entity Relationship Diagram		Average
.ese	Millions Email Generator Email List File		Rare
.esp	ACD/Labs Dataset		Uncommon
.est	Construction Cost Estimate File		Uncommon
.esx	Xactimate Insurance Claims Estimate		Average
.et	Easiteach Lesson File		Uncommon
.etd	Adobe Reader EBX Transfer Data File		Average
.ev	Echoview File		Average
.ev3	Team Manager Meet Event File		Uncommon
.evy	Envoy File		Average
.exif	Exchangeable Image Information File		Common
.exp	Aurora Expert Trace File		Uncommon
.exp	Export File		Average
.exx	IBM Linkway MsgPut File		Average
.fa	FASTA Formatted Sequence File		Average
.fasta	FASTA Sequence File		Average
.fdb	Art Explosion Catalog		Average
.fdb	Portfolio Catalog		Common
.fdm	Exchange Forms Designer Form Message		Average
.ffd	Flat File Description		Average
.ffo	Adobe Photoshop File Information File		Rare
.ffwp	FormsForWeb Packet		Average
.fhc	FHC Data File		Average
.fid	File Expander Engine Descriptions Database		Uncommon
.fil	Files List Object File		Average
.flame	Fractal Flame File		Average
.flipchart	ActivInspire Flipchart File		Average
.flk	Folder Lock File		Average
.fll	FoxPro Dynamic-Link Library		Average
.flo	RFFlow Flowchart File		Average
.flo	iGrafx FlowCharter File		Average
.flp	ActivPrimary Flipchart File		Average
.flp	Flash Project		Rare
.flt	Flight Simulator Saved Flight		Average
.fo	XSL-FO Form		Average
.fob	Dynamics NAV Object Container File		Average
.fop	InfoZoom Protected Data File		Average
.fox	InfoZoom Data File		Average
.fpsl	FileMaker Pro Snapshot Link		Average
.frl	Electronic Form Loader		Average
.frm	ADL Form		Uncommon
.fro	dBASE IV Compiled Report		Average
.frx	FoxPro Report		Average
.fsb	FMOD Sample Bank File		Average
.fsc	Practical Scriptwriter File		Average
.ftl	Family Tree Legends File		Uncommon
.ftm	Family Tree Maker for DOS File		Uncommon
.ftw	Family Tree Maker File		Average
.fxf	BigFix Action File		Uncommon
.fxp	Adobe Flex Project File		Common
.gallery	SMART Notebook Gallery File		Average
.gallerycollection	SMART Notebook Gallery Collection File		Average
.galleryitem	SMART Notebook Gallery Item File		Average
.gan	GanttProject Project File		Average
.gbr	Gerber File		Common
.gc	GraphClick File		Average
.gcx	Grapher Graph File		Average
.ged	GEDCOM Genealogy Data File		Average
.gedcom	GEDCOM Genealogy File		Average
.gen	ArcView ARC/INFO UnGenerate file		Uncommon
.ggb	GeoGebra Document		Average
.gis	CFS Console Game Installer Settings File		Rare
.gld	Ground Loop Design Work File		Average
.gls	Babylon Glossary File		Average
.gms	Gesture and Motion Signal File		Average
.gno	GenoPro Genealogy Tree File		Average
.gnp	GNPeak Output File		Rare
.gnutar	GNU Tar Archive		Rare
.gp3	Guitar Pro 3 File		Uncommon
.gpf	Grant Agreement Preparation Form		Uncommon
.gpi	Garmin Point of Interest File		Common
.gpr	Babylon Glossary Builder Project File		Uncommon
.gra	Microsoft Graph File		Average
.grade	GradeStat Document		Average
.grf	DPlot Graph File		Common
.grf	Generic Graph File		Rare
.grib	Gridded Binary File		Average
.grk	Gradekeeper Class Gradebook File		Average
.grp	SmarterMail Group File		Average
.grr	Gradekeeper Class Roster File		Average
.grv	Office Groove File		Average
.gs	GemStone Document		Average
.gtar	GNU Tar Archive		Rare
.gtp	Guitar Pro File		Average
.gwk	GraphiCode PCB Job File		Average
.gwp	Greetings Workshop Project File		Uncommon
.gxl	Graph Exchange Language File		Average
.hcc	HydroCAD Prefab Chamber Data File		Average
.hce	HydroCAD Hydrograph Data File		Average
.hci	HydroCAD IDF Data File		Average
.hcr	HydroCAD Rainfall Curve Data File		Average
.hcu	Hydrograph Units Definitons File		Average
.hcx	ChartXL Chart		Rare
.hda	HotDocs Auto-Assemble File		Average
.hdf	Hierarchical Data Format File		Common
.hdi	HotDocs Auto-Install File		Average
.hdl	HotDocs Library		Average
.hif	Quicken Online File		Average
.hkdb	Apple iTunes Library File		Uncommon
.hl	HeuristicLab Storage File		Average
.hml	HostMonitor TestList File		Average
.hmt	HighMAT File		Rare
.hs2	HyperRESEARCH 2 Study File		Average
.hsk	Huskey Truss & Building Supply Import File		Rare
.hst	History File		Average
.htb	Audacity Help File		Rare
.htg	HackTheGame Mission Pack		Uncommon
.huh	HydroCAD Unit Hydrograph Definitions File		Average
.hyv	Team Manager Meet Event File		Average
.i5z	IUCLID 5 Import/Export File		Average
.ibcd	InstantBingoCard Document		Average
.icalevent	iCal Event File		Uncommon
.icaltodo	iCal To Do File		Uncommon
.ics	iCalendar File		Common
.id2	Windows Live Messenger Emoticon File		Common
.idx	Navigation POI File		Average
.idx	HMI Historical Log Index File		Average
.ies	IES Photometric Data File		Average
.igc	Anime List Builder Input File		Average
.ii	IconWorkshop Extended Information File		Common
.iif	Intuit Interchange Format File		Average
.imt	My Time Data File		Average
.incp	InCopy CS3 Package File		Uncommon
.ink	Mimio Ink Data File		Uncommon
.inp	ABAQUS Input File		Average
.ins	Inspiration File		Average
.ip	IconPackager Theme File		Average
.ipmeta	Apple iPhoto Metadata File		Average
.iproject	iClone Project File		Uncommon
.irock	intelliRock Sensor Data File		Average
.irp	Internet Researcher Project File		Uncommon
.irr	Brewer Lamp File		Uncommon
.irx	Brewer Irradiation File		Rare
.is1	M3 Sakura Real-Time Save 1 File		Rare
.is1	Synergy/DE Data Index File		Rare
.isf	Inspiration Flowchart Document		Average
.ish1	Animation-ish Wiggledoodle-ish Document		Average
.ish2	Animation-ish FlipBook-ish Document		Average
.ish3	Animation-ish Advanced-ish Document		Average
.ist	Inspiration Template		Uncommon
.ite	iTunes Extras File		Average
.itl	iTunes Library File		Average
.itlp	iTunes LP Album File		Average
.itm	iThink Model File		Average
.itn	TomTom Navigator Itinerary File		Average
.itx	ITX Form Template		Average
.iup	Fritz Update File		Uncommon
.ivc	InteliSea Vessel Configuration File		Uncommon
.ivt	Beyond 20/20 Table File		Average
.iw	Chain Engineering Database File		Uncommon
.ix2	WordPerfect Address Book File		Average
.ixb	Ulead Disc Image		Average
.jasper	JasperReports Data File		Average
.jbi	Motoman Robot Job File		Average
.jdb	Symantec Endpoint Protection Update File		Common
.jef	Janome Embroidery Format		Average
.jmp	JMP Data File		Average
.jnt	Windows Journal File		Common
.joboptions	Adobe Joboptions File		Average
.joined	HJ-Split Data File		Average
.jph	JProbe Memory Snapshot		Average
.jrprint	JasperReports Print File		Common
.jrxml	JasperReports Layout File		Average
.jude	JUDE Project File		Average
.kap	BSB Chart Image File		Average
.kdc	Kaspersky Virus Database File		Common
.key	Keynote Presentation		Very Common
.kid	Kidspiration Document		Average
.kismac	KisMAC Webservice File		Average
.koob	Koob E-Book File		Uncommon
.kpf	Komodo Project File		Average
.kpp	Kid Pix Presentation		Average
.kpr	KPresenter Presentation		Average
.kpx	Kid Pix Picture		Average
.kpz	Komodo Template File		Average
.kvtml	KWordQuiz File		Uncommon
.l	Game of Life File		Rare
.l6t	Line 6 Tone File		Average
.laccdb	Microsoft Access Lock File		Uncommon
.las	LIDAR Data Exchange File		Average
.lbl	NiceLabel Template File		Average
.lbx	FoxPro Label File		Uncommon
.lcd	ABBYY Language File		Average
.lcm	Lipikar Custom Map File		Average
.ldf	SQL Server Transaction Log File		Average
.ldif	LDAP Data Interchange Format File		Average
.lex	Adobe Linguistic Library Data File		Uncommon
.lgf	PMSCAN Log File		Uncommon
.lgh	HMI Historical Log File		Average
.lgi	Multimedia Logic File		Average
.lgl	Large Graph Layout Edge File		Rare
.lib	Generic Data Library		Common
.lif	TurboTax Information Archive		Average
.livereg	Symantec Antivirus Session File		Average
.liveupdate	Symantec LiveUpdate File		Common
.lix	ExtendSim Simulation Software Library		Average
.lix	Logos Library System File		Average
.llb	LabVIEW Library File		Average
.lms	LenMus Score File		Average
.lmx	Landmark Exchange File		Average
.lng	MAME Language File		Uncommon
.lnt	LiveNote Case File		Uncommon
.loc	GPS Location File		Average
.lp7	LP7 Digitally Signed File		Average
.lrcat	Adobe Photoshop Lightroom Catalog File		Average
.lrdata	Adobe Photoshop Lightroom Data File		Average
.lrf	Sony Portable Reader File		Average
.lrs	Librie Reader Source File		Average
.lrx	Sony Portable Reader File		Average
.lsf	Logos Library System File		Average
.lsl	LightScribe Label		Average
.lsp	LANsurveyor Poll List		Average
.lsr	LANsurveyor Report		Average
.lst	LightScribe Label Template		Uncommon
.lsu	LANsurveyor Map		Average
.lvm	LabVIEW Measurement File		Average
.lvw	Livewire Document		Uncommon
.lw4	Lightwright File		Average
.ly	LilyPond File		Average
.m	Mathematica Input File		Common
.macbin	Macbinary Encoded File		Uncommon
.maf	Mutation Annotation Format File		Average
.mag	Magic Circuit Layout File		Uncommon
.mai	Microsoft Mail File		Average
.map	Weather Defender Map		Uncommon
.mat	MATLAB MAT-File		Common
.mbb	ManaBook Book File		Rare
.mbd	Multimedia Builder Project File		Average
.mbf	Microsoft Money Backup File		Average
.mbg	Microsoft Mailbag		Average
.mbg	Mailbag Assistant Mailbox File		Average
.mbl	Logger Pro Data File		Average
.mbp	Mobipocket Notes File		Average
.mbx	Outlook Express Mailbox		Average
.mc1	MedCalc Data File		Average
.mcd	Mathcad Document		Common
.mcxe	MedicinesComplete Data File		Rare
.md	Moneydance Financial Data File		Average
.md8	GarageCUBE Modul8 Project		Uncommon
.mdc	Multi Dimension Cube File		Average
.mdf	Measurement Data Format File		Average
.mdl	Simulink Model File		Average
.mdl	Rational Rose Model File		Average
.mdm	HLM Multivariate Data Matrix File		Average
.mdx	Multiple Index File		Average
.mdx	Rational XDE Model File		Uncommon
.mdz	Access Wizard Template		Average
.mem	Mnemosyne Card Collection		Uncommon
.menc	Windows Mobile Encrypted File		Common
.met	eMule Resource File		Common
.mex	Macro Express File		Average
.mfa	MobileFrame App File		Average
.mfe	MobileFrame Enterprise Data File		Uncommon
.mfl	Mozilla FastLoad File		Average
.mfo	Perl ModInfo Descriptor File		Average
.mfo	MobileFrame Object File		Uncommon
.mfp	Macromedia FlashPaper Document		Average
.mfp	MobileFrame Package		Average
.mft	Kaspersky File Table		Uncommon
.mfu	MobileFrame Update File		Average
.mfv	MobileFrame Device Pack File		Uncommon
.mgc	MGCSoft Equation Illustrator File		Average
.mission	MissionMaker Project File		Uncommon
.mit	MineEdit Inventory Template File		Rare
.mls	Milestones Simplicity File		Average
.mm	FreeMind Mind Map		Average
.mma	Master Album Maker Photo Album File		Uncommon
.mmap	MindManager Map File		Average
.mmc	Microsoft Media Catalog		Average
.mmf	Microsoft Message File		Uncommon
.mmp	MindManager Mind Map		Average
.mmp	Master Album Maker Project		Average
.mmu	myPM Merge Data File		Uncommon
.mnc	My Notes Center Notebook		Average
.mng	Yamaha PSR Disk Manager File		Rare
.mnk	My Notes Keeper Notebook		Average
.mno	Macromedia Design Note		Average
.mny	Microsoft Money File		Average
.mobi	Mobipocket eBook		Average
.moho	Anime Studio Animation Project		Average
.mosaic	MacOSaiX Mosaic File		Average
.mox	ExtendSim Simulation Software Model		Average
.mpd	File List Creator Playlist		Uncommon
.mpj	RoboHelp HTML Project		Average
.mpj	Minitab Project File		Average
.mpp	Microsoft Project File		Common
.mpp	MobileFrame Project Publisher File		Average
.mpr	FileMaker Dictionary File		Uncommon
.mpt	Microsoft Project Template		Average
.mpx	Microsoft Project Exchange File		Average
.mpz	Miradi Project File		Average
.mpzip	Multisim Pack File		Uncommon
.mq4	MetaTrader Custom Indicator		Average
.ms10	Multisim 10 Circuit Design File		Average
.ms8	Multisim 8 Circuit Design File		Uncommon
.msc	MuseScore Composition File		Uncommon
.msp	ClarisWorks Dictionary File		Rare
.mss	MyScreenSaver Builder File		Uncommon
.mtf	Mortality Table File		Uncommon
.mth	Derive Math File		Average
.mtw	Minitab Worksheet File		Average
.muf	Alpha Five Licence File		Uncommon
.mw	Maple Worksheet		Common
.mwf	MapGuide Author Map Window File		Common
.mws	Maple Classic Worksheet		Average
.mwx	MicroWorlds EX File		Uncommon
.mx	Mathematica Serialized Package File		Average
.mxad	Mandelbrot Explorer All Data File		Average
.mxc2	MAGIX Cache File		Average
.mxi	Adobe Extension Information File		Average
.myi	MySQL MyISAM Index File		Average
.nap	McAfee ePO Network Associates Package		Average
.nbk	SMART Notebook File		Average
.nbp	Mathematica Player Notebook File		Common
.ndb	ClamAV Extended Signature File		Uncommon
.ndif	Nokia Data File		Uncommon
.ndk	Lotus Notes Design Elements File		Average
.ndx	dBASE Index File		Common
.net	netViz Project File		Average
.neta	Netica Binary File		Average
.nfo	Folio Views Infobase File		Rare
.nitf	National Imagery Transmission Format File		Average
.nmind	NovaMind Mind Map File		Average
.nmp	NewsMaker Project File		Uncommon
.nni	ANNI Neural Network Investing File		Uncommon
.nnp	ANNI Neural Network Portfolio File		Average
.not	Notation File		Common
.notebook	SMART Notebook File		Common
.np	Portfolio NetPublish File		Average
.npl	Nokia Playlist File		Average
.npr	Nuendo Project File		Average
.npt	Portfolio NetPublish Template		Average
.nrb	Nero CD-ROM Boot Compilation		Average
.nrc	Nero Disc Compilation File		Average
.nrd	Nero DVD-Video Compilation File		Average
.nrl	Autonomy Interwoven Link File		Average
.nrm	Nero Mixed Mode CD Compilation		Average
.nru	Nero UDF CD-ROM Compilation		Average
.nsq	NScheduler Data File		Average
.ntx	Clipper Index File		Uncommon
.nvl	UniChem Results File		Average
.oab	Offline Address Book		Average
.obd	Office Binder Document		Average
.obj	Relocatable Object Code		Average
.od	Mascopt Graph Request File		Rare
.odc	OpenDocument Chart File		Uncommon
.odf	Open Document File		Rare
.odp	OpenDocument Presentation		Average
.odx	BizTalk Server Orchestration File		Average
.oeaccount	Windows Mail Account File		Common
.oeb	Open eBook File		Uncommon
.ofc	Open Financial Connectivity File		Average
.ofm	OmniForm Form		Average
.oft	Outlook File Template		Average
.ofx	Open Financial Exchange File		Average
.olk	Outlook Address Book File		Uncommon
.olk14category	Outlook Category File		Uncommon
.olk14contact	Outlook Contact File		Uncommon
.olk14event	Outlook Calendar Event File		Uncommon
.olk14group	Outlook Group File		Uncommon
.olk14mailaccount	Outlook Mail Account File		Uncommon
.olk14message	Outlook Message File		Average
.olk14msgsource	Outlook Email Message Data File		Uncommon
.olk14note	Outlook Note File		Uncommon
.olk14signature	Outlook Signature File		Uncommon
.olk14task	Outlook Task File		Rare
.omcs	Office Manager Access File		Uncommon
.omp	Office Manager Document Archive		Average
.ond	Lotus Notes Encapsulated Memo File		Average
.one	OneNote Document		Average
.oo3	OmniOutliner 3 File		Average
.opf	FlipViewer FlipBook File		Uncommon
.opx	OrgPlus Org Chart		Average
.opx	FlipAlbum Photo Album File		Average
.or2	Lotus Organizer 2 File		Rare
.or3	IBM Lotus Organizer 97 File		Rare
.or4	IBM Lotus Organizer 97 GS File		Uncommon
.or5	Lotus Organizer 5 File		Uncommon
.or6	Lotus Organizer 6 File		Average
.org	Lotus Organizer File		Average
.otf	OpenTuft Tufting Design File		Uncommon
.otl	NoteTab Outline File		Average
.otln	Opal Outline File		Average
.otp	OpenDocument Presentation Template		Average
.out	Output File		Common
.ova	Octava Musical Score		Uncommon
.ova	Open Virtual Appliance		Average
.ovf	Open Virtualization File		Common
.pab	Personal Address Book		Average
.paf	Personal Ancestral File		Uncommon
.pbd	ProBID+ Data File		Uncommon
.pbk	Dial-Up Phone Book File		Average
.pc	Personal Composer File		Average
.pcap	Packet Capture Data		Average
.pcb	Printed Circuit Board Design File		Average
.pcr	PCMark Vantage Benchmark File		Common
.pd4	Windows Live Photo Gallery Information File		Average
.pd5	Windows Live Photo Gallery Information File		Average
.pdas	PDAStore Data Store File		Average
.pdb	Protein Data Bank File		Average
.pdd	Medtronic Programmer Data File		Rare
.pdfig	PDF Index Generator Project File		Average
.pdo	Pepakura Designer File		Average
.pds	Planetary Data System File		Average
.pdx	Product Data eXchange File		Average
.pdx	Adobe Acrobat Index File		Common
.peb	ProEST+ Buildings File		Uncommon
.pec	Brother Embroidery File		Rare
.pep	TurboProject Project File		Average
.pex	Merak Peep Data File		Average
.pf	Windows Prefetcher File		Uncommon
.pfc	AOL Personal File Cabinet		Common
.pfl	Family Lawyer Document		Average
.pgpf	Password Generator Password File		Rare
.phb	Motorola Phone Book File		Average
.phm	Pro Home Manager Data File		Average
.pi	Pi Calculation Data File		Average
.pis	PS2DIS Project File		Uncommon
.pjx	FoxPro Project		Average
.pka	Packet Tracer Activity File		Average
.pkb	Oracle Package Body File		Average
.pkh	Oracle Package File		Average
.pks	Oracle Package Spec File		Average
.pkt	Packet Tracer Network Simulation Model		Average
.pln	Spaceman Planogram File		Uncommon
.pls	MYOB Accounting Data File		Average
.plw	PicoLog Data File		Average
.pml	Process Monitor Log File		Average
.pmm	Pegasus Mail Mailbox File		Average
.pmm	MikuMikuDance PolygonMovieMaker File		Average
.pmo	Broderbund Print Meta Object File		Average
.pmr	Performance Monitor Report		Average
.pnproj	Programmer's Notepad Project File		Average
.pnpt	Programmer's Notepad Project Template		Uncommon
.pns	Popnoggin Subject File		Uncommon
.pnt	Popnoggin Theme File		Uncommon
.pod	OpenProj Project File		Average
.poi	Magellan Maestro Point of Interest File		Average
.pos	Trimble Position File		Rare
.postal	TomTom Postal Code File		Uncommon
.pot	PowerPoint Template		Average
.potm	PowerPoint Open XML Macro-Enabled Presentation Template		Average
.potx	PowerPoint Open XML Presentation Template		Average
.pp2	PingPlotter Data File		Average
.ppf	Publisher Project File		Uncommon
.ppf	Transit NXT Pack Project File		Average
.ppf	Edgecam Pathtrace Part File		Common
.ppp	CyberLink PowerProducer Project		Common
.pps	PowerPoint Slide Show		Very Common
.ppsm	PowerPoint Open XML Macro-Enabled Slide Show		Average
.ppsx	PowerPoint Open XML Slide Show		Common
.ppt	PowerPoint Presentation		Very Common
.pptm	PowerPoint Open XML Macro-Enabled Presentation		Common
.pptx	PowerPoint Open XML Presentation		Very Common
.prb	xyAlgebra Probabilities File		Rare
.prc	Mobipocket eBook File		Average
.prc	Corel Presentation		Rare
.pre	Lotus Freelance Graphics File		Uncommon
.prf	Plot Station Plot Request File		Rare
.prj	Project File		Common
.prj	AIMMS Project File		Average
.prn	Lotus 1-2-3 Formatted Text File		Uncommon
.prp	Rational Model Properties File		Uncommon
.prs	Calyx Point Prospect File		Uncommon
.prs	Harvard Graphics Presentation		Average
.prt	Presentations Template		Average
.psa	Photoshop Album Catalog File		Average
.psf	SPI Proxy Output File		Rare
.psf	GPS Prediction Support File		Uncommon
.psf	PID Script File		Rare
.psm	Prism Document		Uncommon
.pspd	PhotoSuite 5 Project File		Average
.pst	Outlook Personal Information Store File		Common
.ptb	Power Tab File		Average
.ptf	Scrapbook Flair Template		Average
.ptk	Quicken Online Financial Data File		Average
.ptn	PaperPort Thumbnail File		Average
.ptz	E-Transcript Bundle File		Common
.pvl	Instalit Library		Average
.pxa	XpressAccounts Data File		Uncommon
.pxc	Photodex Cache File		Uncommon
.pxf	Transit XV Pack Project File		Average
.pxj	RecordNow Project		Average
.pxl	Pocket Excel File		Average
.q07	QuickTax 2007 Tax Return		Uncommon
.q08	QuickTax 2008 Tax Return		Average
.q09	QuickTax 2009 Tax Return		Average
.q3d	Quest3D Project File		Uncommon
.qb2005	QuickBooks 2005 File		Rare
.qb2006	QuickBooks 2006 File		Uncommon
.qb2007	QuickBooks 2007 File		Uncommon
.qb2009	QuickBooks 2009 File		Common
.qb2010	QuickBooks 2010 File		Common
.qbw	QuickBooks Data File		Common
.qdat	QuickTime Install Cache File		Rare
.qdf	Snapform File		Uncommon
.qdf	Quicken Data File		Common
.qdfm	Quicken Data File (Macintosh)		Average
.qdp	Quick and Dandy Plotter File		Average
.qel	Quicken Electronic Library		Average
.qfx	Quicken Financial Exchange File		Common
.qif	Quicken Interchange Format File		Common
.qm	Qt Compiled Translation Source File		Uncommon
.qpb	Quicken Payroll File		Average
.qpf	Quartus II Project File		Average
.qpf	Quest3D Project		Uncommon
.qph	Quicken Price History File		Average
.qph	Nokia Qt Phrase Books File		Uncommon
.qpm	Quick Pallet Maker Input Data		Average
.qrc	QuarkXPress Required Component File		Average
.qrp	QuSoft QuickReports File		Average
.qsd	Quicken Data File		Uncommon
.ral	WinRail Track Design File		Average
.rbt	Lego MINDSTORMS NXT Program		Average
.rcd	Arcade File		Rare
.rcg	Recog Character Recognition Set		Average
.rdb	N64 ROM Database		Average
.rdx	Reflex Data File		Rare
.reb	Reimbursement Tracker Data File		Rare
.ref	Microsoft Train Simulator Reference File		Uncommon
.reference	Budget In Brief Reference File		Rare
.rel	Norton Internet Security Log File		Rare
.ret	BusinessObjects Template		Average
.rf1	Retirement Forecast File		Average
.rfa	Revit Family File		Average
.rfo	RoboForm Option File		Average
.rge	Entourage File Archive		Average
.rgo	RepliGo File		Average
.rmuf	Alpha Five Runtime License File		Rare
.rng	RELAX NG File		Uncommon
.rnq	Renque Model File		Average
.roca	RIB office Compressed Archive		Uncommon
.rod	Actuate Report Object Design File		Average
.rog	Roger 2 Input Data File		Average
.roi	Report Object Instance		Average
.roi	Shark Sales System Data File		Uncommon
.rou	Gerber Route File		Average
.rox	Roxio Project File		Common
.roxio	Roxio Project		Uncommon
.rpa	RIB Project Archive File		Uncommon
.rpd	Roleplay Designer Data File		Uncommon
.rpp	REAPER Project File		Average
.rpt	Crystal Reports File		Average
.rrt	Rhapzode Resource Template		Uncommon
.rsc	Symbian Application Compiled Resource File		Average
.rsp	RSLogix PLC Program File		Average
.rsv	RSView32 Project File		Average
.rsw	R&R SQL Report Writer Report File		Average
.rte	Revit Project Template		Average
.rte	Navigation Route		Average
.rvt	Revit Project File		Common
.rwg	Random Word Generator Project File		Rare
.rzb	Red Zion Book File		Average
.s85	Sabre Airline Solutions Chart		Average
.sam07	SAM 2007 Package		Rare
.sar	Sibelius Arrange Style		Average
.sav	SPSS Data File		Average
.sbd	Superbase Data Definition File		Uncommon
.sbd	Office Accounting Company Data File		Average
.sbf	SmartBroker Data		Average
.sbq	Superbase QuickReports File		Uncommon
.sbt	Superbase Data Notes File		Rare
.sbw	US Treasury Savings Bonds Wizard File		Average
.sbx	ESRI Spatial Index File		Average
.sc45	SuperCard Project File		Average
.sca	Norton AntiVirus Scan File		Average
.scd	Data Rescue Saved Scan File		Uncommon
.scd	TurboTax Tax Schedule List		Average
.scexcludb	Spring Cleaning Exclusions File		Rare
.scf	DNA Sequence Chromatogram File		Average
.scg	myPM SCG Definition File		Average
.sch	EAGLE Schematics File		Average
.sch	SuperCard Help Project File		Uncommon
.scm	Samsung Channel List File		Uncommon
.screstorelog	Spring Cleaning Restore Log		Rare
.scresults	Spring Cleaning Results File		Uncommon
.scx	SuperCard Help Project		Uncommon
.scz	SmartDraw Collection Package File		Average
.sdd	StarOffice Presentation		Average
.sdf	Standard Data File		Very Common
.sdf	Structure Data File		Common
.sdp	Session Description Protocol File		Average
.sdq	SAS Data File		Average
.sds	SDS Apps Data File		Uncommon
.sds	OpenOffice.org Chart		Average
.sel	LinkOne Selection List File		Uncommon
.sen	SenTest Data File		Average
.seo	SEO Note File		Average
.seq	DNA Sequence Text File		Uncommon
.ser	GeneMapper Project File		Uncommon
.sgml	Standard Generalized Markup Language File		Average
.sgn	Slax Boot File		Uncommon
.shc	Adobe Photoshop Contours File		Uncommon
.shs	Microsoft Scrap File		Rare
.shw	Corel Presentation		Average
.shx	Shapefile Index File		Average
.sidx	StuffIt Archive Index File		Average
.sim	SAP Tutor File		Average
.skc	SideKick Card File		Rare
.skv	XLANG Schedule Drawing File		Average
.skv	Semicolon Separated Values File		Average
.skx	XLANG Schedule File		Average
.sldtm	SDL Translation Memory File		Average
.sle	Sisulizer Package File		Average
.slk	Symbolic Link File		Average
.slp	Sisulizer Project File		Average
.snag	SnagIt Capture File		Common
.snapfireshow	Corel SnapfireShow File		Average
.sonic	DigitalMedia Project File		Rare
.soundpack	SoundPackager Sound Package		Uncommon
.sp45	SuperCard Player File		Uncommon
.spk	Bright Spark Document		Uncommon
.spo	SPSS Statistical Data Output File		Uncommon
.sps	SPSS Program File		Average
.spub	Disc Cover File		Average
.spv	SPSS Output File		Average
.sq	Sysquake Program		Average
.sqd	SQ Data File		Average
.sqr	SQL Program File		Average
.ssp	Screensaver Producer Project File		Average
.st45	SuperCard Trial Project FIle		Uncommon
.sta	Adobe Photoshop Match Color Image Statistics File		Uncommon
.sta	ABAQUS Status File		Average
.stf	Exchange 2000 Server Temporary File		Uncommon
.sti	StarOffice Presentation Template		Average
.stk	Stickfigure Animator File		Average
.stl	Fireworks Style Library		Uncommon
.stm	Exchange Streaming Media File		Common
.stp	Analysis Studio Project Information File		Average
.str	dBASE Structure List Object File		Average
.stt	Kaspersky Statistics File		Uncommon
.stu	Pinnacle Studio Project File		Average
.stw	STATISTICA Workbook		Average
.sty	NewsMaker Story File		Rare
.styk	Stykz Stick Figure		Average
.stykz	Stykz Animation		Average
.sui	StarSplatter User Interface File		Rare
.svf	Serial Vector Format File		Common
.swk	StudyWorks Save File		Average
.sxi	StarOffice Impress Presentation		Average
.sy3	Harvard Graphics Symbol File		Rare
.sylk	Microsoft Symbolic Link File		Uncommon
.t01	TaxCut 2001 File		Average
.t02	TaxCut 2002 File		Average
.t03	TaxCut 2003 File		Average
.t04	TaxCut 2004 File		Average
.t05	TaxCut 2005 Tax Return		Average
.t06	TaxCut 2006 Tax Return		Average
.t07	TaxCut 2007 Tax Return		Average
.t08	TaxCut 2008 Tax Return		Common
.t09	At Home 2009 Tax Return		Common
.t10	At Home 2010 Tax Return		Common
.t2	Textease 2000 File		Uncommon
.tar	Consolidated Unix File Archive		Common
.tax08	TurboTax 2008 Tax Return File		Rare
.tax09	TurboTax 2009 Tax Return File		Rare
.tax10	TurboTax 2010 Tax Return File		Uncommon
.tax2008	TurboTax 2008 Tax Return		Average
.tax2009	TurboTax 2009 Tax Return		Common
.tax2010	TurboTax 2010 Tax Return		Common
.tb	Tabbery Tab File		Average
.tbk	ToolBook File		Average
.tbl	StarCraft Information Table		Average
.tc	Tellico Collection File		Uncommon
.tcc	TimeCalc Classic Data File		Average
.tcx	Training Center Database File		Average
.tda	Java Application Thread Dump		Average
.tda	Palm To-Do File		Average
.tde	Tablaeu Data Extract File		Average
.tdl	Tab Delineated Format File		Uncommon
.tdm	LabVIEW Binary Measurement File		Average
.tdt	THOR Data Tree File		Average
.tdt	FirstBreak Concrete Test File		Uncommon
.te3	WinTrack Object File		Average
.tef	TablEdit Tablature		Average
.tet	Textease CT Template		Average
.tfa	TreeSoft CashFlow Analysis Data File		Average
.tfd	Tape Format Requirements Document		Average
.tjp	TaskJuggler Project File		Average
.tk3	TK3 Multimedia eBook		Average
.tkfl	TKLinks Saver Favorite Links File		Average
.tlx	Standard Dictionary File		Uncommon
.tmr	Apimac Timer Document		Uncommon
.tmw	Translation Memory Data File		Uncommon
.tol	AOL Tool File		Rare
.topc	TopicCrunch Project File		Average
.tpb	GROMACS Binary Input File		Average
.tpf	Transit NXT Pack Translation File		Average
.tps	Multi Channel Measurement File		Average
.tpz	Kindle Topaz eBook File		Common
.tr3	TomeRaider eBook File		Average
.tra	WinTrack Railroad Track File		Average
.trd	TrID Definitions Package		Average
.trk	Garmin Track File		Rare
.trk	CompeGPS Land Track File		Average
.trs	WinTrack Railroad Track Text File		Average
.trs	Rosetta Stone Language Data File		Common
.trx	Firmware Image File		Uncommon
.trx	WebAuthorize Batch File		Uncommon
.ts	Nokia Qt Translation Source File		Average
.tst	TestPoint Test File		Average
.tsv	Tab Separated Values File		Common
.tt10	Canadian TurboTax 2010 Tax Return		Common
.ttk	Catalyst Translation Toolkit		Average
.twb	Tableau Workbook File		Average
.twbx	Tableau Packaged Workbook		Average
.txa	Midas ViewPoint Text Array List		Average
.txd	Game Texture Dictionary		Average
.txf	Tax Exchange Format		Average
.txf	Transit XV Pack Translation File		Uncommon
.txn	MySpaceIM Conversation Log File		Average
.uccapilog	Microsoft UCC API Log File		Common
.ud	OmniPage User Dictionary		Uncommon
.udc	Adobe InDesign User Dictionary		Average
.udeb	Debian Package File		Uncommon
.uds	Sierra Generations File		Rare
.uds	Uniform Data System File		Uncommon
.ulf	Universal List File		Average
.ulz	USBlyzer Data Capture File		Average
.umf	MediaHolder Universal Media Format File		Uncommon
.unitypackage	Unity Package File		Average
.update	ISAPI Update File		Uncommon
.upoi	iGO Points of Interest File		Average
.upr	FileMaker User Dictionary		Average
.ustar	Uniform Standard Tape Archive Format File		Rare
.uvf	Uncertain Value Format		Average
.uwl	User Word List File		Common
.val	Values List		Average
.val	Valodas Dictionary File		Uncommon
.vbpf1	Virtual Business - Personal Finance Data File		Average
.vbw	Visual Basic Workspace File		Average
.vcd	Value Change Dump File		Average
.vce	Visual CertExam Exam File		Average
.vcf	vCard File		Very Common
.vcs	vCalendar Event File		Average
.vdb	Symantec Virus Database File		Common
.vdx	Visio Drawing XML File		Common
.vfs	VentaFax Schedule File		Rare
.vi	LabVIEW Virtual Instrument File		Average
.vip	Stitch Pattern File		Uncommon
.vle	Virtual Labs Electricity Circuit File		Rare
.vlg	VentaFax Logbook File		Rare
.vmt	Valve Material File		Average
.voi	VOI Group File		Average
.vok	PocketVok Vocabulary File		Average
.vpx	Avast! Virus Update File		Average
.vrd	Visio Report Definition File		Average
.vscontent	Visual Studio Content File		Average
.vsv	Virtual Machine Saved State File		Average
.vsx	Visio Stencil XML File		Average
.vtx	Visio Template XML File		Average
.vud	Virtual Machine Undo Drive File		Average
.vvf	Voc Vocabulary File		Rare
.vxml	VoiceXML File		Common
.w02	Split Archive File		Rare
.wab	Windows Address Book		Common
.wb1	Corel Quattro Pro File		Uncommon
.wb2	Corel Quattro Pro File		Average
.wb3	Corel Quattro Pro 7 and 8 File		Common
.wcd	Works Calendar File		Average
.wdf	WinGenea Genealogy File		Rare
.wdf	Workshare Compare DeltaFile		Common
.wdq	Offline Explorer Queue File		Uncommon
.wea	Ecotect Weather File		Average
.wfm	dBASE Form		Uncommon
.wgt	IMPS Data File		Average
.wgt	XNBC Synaptic Weights File		Average
.windowslivecontact	Windows Live Contacts File		Common
.wjr	ReGet Deluxe Data File		Average
.wk1	Lotus Worksheet		Uncommon
.wk2	Lotus 2 Worksheet		Rare
.wk3	Lotus 3 Worksheet		Uncommon
.wk4	Lotus 4 Worksheet		Uncommon
.wk5	Lotus 5 Worksheet		Uncommon
.wke	Lotus 1-2-3 Educational Version Worksheet		Rare
.wki	Lotus 2 Worksheet		Average
.wnk	Wink Presentation		Average
.wpc	Pazzles Cutting File		Uncommon
.wpc	WordPad Converter File		Average
.wpf	WordPerfect Form		Uncommon
.wpk	GuinXell Package File		Rare
.wpo	HOLUX Waypoint File		Uncommon
.wpo	Technopress Waypoint 2D File		Rare
.wsi	Wise Package Studio Installer Package		Average
.wsm	Wise Package Studio Merge Module		Average
.wtb	Win-Test Binary Log File		Average
.wtr	Encarta File		Rare
.xas	Pro/ENGINEER Assembly Instance Accelerator File		Uncommon
.xbc	SMART Notebook File		Average
.xbk	SMART Notebook File		Uncommon
.xbt	SMART Notebook Template File		Uncommon
.xdb	Symantec Virus Database File		Common
.xdp	XML Data Package		Average
.xds	LcdStudio Design File		Uncommon
.xef	eManager Form Data		Average
.xem	PowerDesigner Model definition File		Average
.xfd	FormFlow 99 Form Data File		Uncommon
.xfd	XFD File		Common
.xfdf	Adobe Acrobat XFDF File		Common
.xfo	XSL-FO Formatted Form		Average
.xft	Adobe Form Designer 5.0 File		Average
.xlc	Excel Chart		Average
.xlgc	ExpressK Database File		Uncommon
.xlt	Excel Template		Average
.xlw	Excel Workbook		Uncommon
.xmcd	Mathcad Worksheet File		Average
.xmi	XML Metadata Interchange File		Average
.xml	XML File		Very Common
.xmlper	LeCroy Binary Waveform File		Average
.xmpz	Miradi XML Project File		Rare
.xpg	Autoplay Media Studio Exported Page		Average
.xpj	Micro Planner X-Pert Project File		Average
.xpj	RoboHelp HTML Project File		Common
.xpm	Micro Planner Manager File		Uncommon
.xpr	SyncRO Soft oXygen XML Editor Project		Average
.xpt	SAS Transport File		Average
.xrp	RationalPlan Project File		Average
.xry	XRY Data File		Average
.xsl	XML Style Sheet		Common
.xslt	XSL Transformation File		Common
.xsn	InfoPath Form Template File		Uncommon
.xsvf	Xilinx Serial Vector Format File		Average
.xtg	Extensible TreeGraph File		Uncommon
.xtm	Xtremsplit Data File		Average
.xtm	CmapTools Exported Topic Map		Uncommon
.xtp	XTree Data File		Rare
.xxd	Brixx Planner Calendar		Rare
.xyz	Molecule Specification File		Uncommon
.yam	Yahoo! Auctions Data		Average
.ychat	Yahoo! Messenger Chat Log		Uncommon
.zap	ZoneAlarm Pro Data File		Common
.zdb	EPSQ Database		Average
.zdb	Quicken Online File		Average
.zdc	CD Catalog Expert Database File		Average
.zix	Quicken Online File		Average
.zmc	ZoneAlarm Quarantine File		Average
.zpl	Zoom Player Play List		Average
.{pb	Corel WordPerfect Document Index File		Rare
.~hm	HostMonitor TestList Backup File		Uncommon