Data File Types - File extensions used for data files.
| Extension | File Description | Popularity | |
| .$er | GroupWise Database | Average | |
| .123 | Lotus 1-2-3 Spreadsheet | Average | |
| .123 | PCB123 Circuit Board Design | Average | |
| .1pe | TurboTax Form File | Average | |
| .1ph | TurboTax File | Average | |
| .3dr | 3DMark Results File | Average | |
| .3dt | 3D Topicscape File | Average | |
| .3me | TurboTax Form File | Uncommon | |
| .3pe | TurboTax 2008 Form File | Uncommon | |
| .4dl | 4th Dimension Database Log File | Uncommon | |
| .4dv | 4D View Ultrasound File | Average | |
| .8xk | TI-83 Plus Application Upgrade File | Uncommon | |
| .a3l | Authorware 3 Library | Average | |
| .a3m | Authorware 3 Macintosh File | Average | |
| .a3w | Authorware 3 Windows File | Average | |
| .a4l | Authorware 4 Library | Average | |
| .a4m | Authorware 4 Macintosh File | Average | |
| .a4w | Authorware 4 Windows File | Average | |
| .a5l | Authorware 5 Library | Average | |
| .a5w | Authorware 5 Windows File | Average | |
| .a65 | Authorware 6.5 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 | |
| .abi | DNA Chromatogram File | Average | |
| .abp | AVS Barcode Profile | Average | |
| .aby | AOL Address Book File | Average | |
| .aca | Agent Character Animation File | Uncommon | |
| .acc | Graphics Accounts Data File | Average | |
| .accdb | Access 2007 Database File | Very Common | |
| .acf | Agent Character Data File | Uncommon | |
| .acg | Agent Preview File | Uncommon | |
| .ade | Access Project Extension | Average | |
| .adp | Access Project | Average | |
| .adt | ACT! Document Template | Average | |
| .adx | Approach Index File | Average | |
| .aft | Ancestry.com Family Tree Database | Average | |
| .agd | AgileGraph Data File | Uncommon | |
| .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 | |
| .an1 | Street Atlas USA Draw File | Uncommon | |
| .anme | Anime Studio Project | Common | |
| .apr | ArcView Project File | Average | |
| .arc | Nintendo Archive File | Rare | |
| .arh | ArheoStratigraf Project File | Rare | |
| .ask | askSam Database | Average | |
| .asm | Solid Edge Assembly Document | Average | |
| .ast | ClarisWorks Assistant File | Uncommon | |
| .at5 | Lowrance Map File | Average | |
| .att | Alphacam Lathe Tool File | Uncommon | |
| .aw | Answer Wizard File | Common | |
| .awg | Activeworlds Object Group File | Average | |
| .azw | Amazon Kindle eBook File | Average | |
| .bafl | BurnAware File List | Uncommon | |
| .bci | Belarc Advisor Report File | Average | |
| .bcm | Business Contact Manager File | Average | |
| .bdf | Binary Data File | Uncommon | |
| .bdic | Chrome Dictionary File | Average | |
| .bfx | Bitware Fax Document | Uncommon | |
| .bgl | Babylon Glossary File | Average | |
| .bgt | Graphics Accounts Data File | Average | |
| .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 | Very Common | |
| .bok | TestGen Testbank File | Average | |
| .box | E-mail Mailbox | 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 | |
| .btr | Btrieve Database File | Uncommon | |
| .cap | Packet Capture File | Average | |
| .cat | Advanced Disk Catalog Database | Average | |
| .cbg | CyberGauge Data File | Average | |
| .cch | Corel Chart File | Average | |
| .ccr | ASTM Continuity of Care Record | Average | |
| .cct | Director Protected Cast Resource | Uncommon | |
| .cdb | Symbian Phonebook Database | Average | |
| .cdb | Pocket Access Database | Common | |
| .cdb | CardScan Contacts Database | Average | |
| .cdd | ConceptDraw Drawing File | Common | |
| .cdf | Common Data Format | Uncommon | |
| .cdf | Content Definition File | Common | |
| .cdp | CD/Spectrum Pro File | Uncommon | |
| .cdr | Crash Data Retrieval Data File | Uncommon | |
| .cdx | Compound Index File | Average | |
| .cel | Battery 3 Drum Cell File | Average | |
| .celtx | Celtx Project File | Average | |
| .chg | Quicken Online Data File | Average | |
| .chk | InterCheck Checksum Database | Uncommon | |
| .chn | Ethnograph Data | Average | |
| .ckd | Kubotek Design Container | Uncommon | |
| .ckt | CircuitMaker File | Average | |
| .cl2 | HY-TEK Meet Results File | Uncommon | |
| .cl4 | Easy CD Creator 4 Project File | Uncommon | |
| .clb | ICQ Contact List | Uncommon | |
| .clix | CLIX Command File | Uncommon | |
| .clm | GenePattern CEL Descriptor File | Rare | |
| .clm | MagicJack Call Log File | Average | |
| .clp | Windows Clipboard File | Average | |
| .cmbl | Logger Pro Data File | Uncommon | |
| .cna | Catena Project File | Average | |
| .contact | Windows Contact File | Common | |
| .cpi | AVCHD Video Clip Information File | Common | |
| .cpmz | Miradi/ConPro Project File | Uncommon | |
| .crd | Windows Cardfile | Average | |
| .crtx | Office 2007 Chart Template File | Average | |
| .csa | PNA Code Calset File | Average | |
| .csv | Comma Separated Values File | Very Common | |
| .ctf | WhereIsIt Catalog | Average | |
| .ctt | Messenger Contact List | Average | |
| .cursorfx | CursorFX Theme File | Average | |
| .curxptheme | CursorXP Theme File | Average | |
| .cvd | ClamAV Virus Definitions File | Average | |
| .cvn | CineVision Encoding Session | Average | |
| .cwk | ClarisWorks Document | Average | |
| .cws | Claris Works Template | Average | |
| .cwz | Circuit Wizard File | Uncommon | |
| .cxt | Director Protected Cast File | Rare | |
| .cyo | Clustify Output File | Average | |
| .cys | Clustify Summary File | Average | |
| .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 | Database File | Very Common | |
| .db2 | dBASE II Database | Average | |
| .db3 | SQLite Database File | Average | |
| .dbc | FoxPro Database | Average | |
| .dbd | DemoShield Project | Average | |
| .dbf | Database File | Average | |
| .dbf | FoxPro Table | Average | |
| .dbx | Visual FoxPro Table | Average | |
| .dcf | Document Computation Format | Common | |
| .dcl | DumpSec Report File | Average | |
| .dcm | DiskCatalogMaker Catalog File | Average | |
| .dcmd | DiskCatalogMaker Thumbnail-Enabled Catalog | Average | |
| .ddc | DivX Descriptor File | Average | |
| .ddcx | DivX Descriptor 2 File | Average | |
| .ddt | Diagram Designer Template | Uncommon | |
| .dem | Digital Elevation Model | Average | |
| .des | QuickBooks Forms Template | Average | |
| .dex | DEXIS Digital X-ray File | Average | |
| .dex | Excel Spreadsheet | Rare | |
| .dfm | Midas ViewPoint Display Form | Average | |
| .dfproj | DVD Flick Project | Average | |
| .dft | Solid Edge Draft Document | Average | |
| .dgb | FlashCAD Drawing Database | Average | |
| .dif | Data Interchange Format | Common | |
| .dii | Summation Batch Load File | Average | |
| .dlg | Digital Line Graph | Average | |
| .dm2 | Toad Data Modeler 2 File | Average | |
| .dmo | Derive Demo | Average | |
| .dmo | Movienizer Database File | Average | |
| .dmsk | DivX Temporary Video Data File | Uncommon | |
| .dnc | Dance Database File | Rare | |
| .dockzip | ObjectDock File | Average | |
| .dp1 | DataPower Database 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 | |
| .dsk | Simple IDs Database | Average | |
| .dsy | Directory Synchronizer Project File | Average | |
| .dsz | Orchida (OES) Embroidery File | Average | |
| .dt0 | DTED Level 0 File | Average | |
| .dt1 | DTED Level 1 File | Common | |
| .dt2 | DTED Level 2 File | Uncommon | |
| .dta | Chain Engineering Database | Rare | |
| .dtr | DATroniC Data Recording | Average | |
| .dvdproj | iDVD Project File | Average | |
| .dvo | Cook'n Cookbook File | Average | |
| .dwi | Dance With Intensity Song File | Average | |
| .e00 | ArcInfo Coverage Export File | Uncommon | |
| .eap | Enterprise Architect Project | Average | |
| .ebuild | Portage eBuild Script | Average | |
| .ec0 | MetroCount Traffic Data File | Uncommon | |
| .eco | ECCO Database File | Average | |
| .ecx | ECCO Corrupted Database File | Average | |
| .edb | Exchange Information Store Database | Average | |
| .edf | Estimator Data File | Average | |
| .edf | ESRF Data File | Uncommon | |
| .eep | EEPROM Data File | Rare | |
| .efx | eFax Document | Very Common | |
| .egp | Easy Grade Pro Gradebook File | Average | |
| .emb | Embroidery Design File | Average | |
| .emb | Everest Embedded Bank File | Average | |
| .emd | ChessBase Tablebase | Average | |
| .emlxpart | Mail Message Attachment | Average | |
| .enc | Electronic Navigation Chart File | Uncommon | |
| .enw | EndNote Citation File | Uncommon | |
| .epp | TalaPhoto Project | Average | |
| .epp | Efficient PPC Project File | Average | |
| .epub | Open eBook File | Average | |
| .epw | EnergyPlus Weather Data File | Common | |
| .er1 | ERWin Entity Relationship Diagram | Average | |
| .esp | ACD/Labs Dataset | Average | |
| .ess | EasySpreadsheet Spreadsheet | Average | |
| .est | Streets & Trips Map File | Average | |
| .est | Construction Cost Estimate File | Uncommon | |
| .esx | Xactimate Insurance Claims Estimate | Average | |
| .et | Easiteach Lesson File | Uncommon | |
| .eta | Google Earth Placemark File | Uncommon | |
| .etd | Adobe Reader EBX Transfer Data File | Average | |
| .etl | Microsoft Event Trace Log File | Average | |
| .ev | Echoview File | Average | |
| .ev3 | Team Manager Meet Event File | Uncommon | |
| .evt | Windows Event Viewer Log File | Average | |
| .evy | Envoy File | Average | |
| .exif | Exchangeable Image Information File | Common | |
| .exp | Export File | Common | |
| .exp | Aurora Expert Trace File | Average | |
| .exx | IBM Linkway MsgPut File | Average | |
| .fa | FASTA Formatted Sequence File | Average | |
| .fasta | FASTA Sequence File | Average | |
| .fbl | iGO Map File | Uncommon | |
| .fcd | First Choice Database | Average | |
| .fcs | First Choice Spreadsheet | Average | |
| .fdb | Portfolio Catalog | Common | |
| .fdb | Art Explosion Catalog | Average | |
| .fdb | Microsoft Dynamics NAV Database File | Average | |
| .ffd | Flat File Description | Average | |
| .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 | |
| .fll | FoxPro Dynamic-Link Library | Average | |
| .flo | iGrafx FlowCharter File | Average | |
| .flo | RFFlow Flowchart File | Average | |
| .flp | Activprimary Flipchart File | Average | |
| .flt | Flight Simulator Saved Flight | Average | |
| .fm | FileMaker Spreadsheet | Average | |
| .fm5 | FileMaker 5 Database | Average | |
| .fmp | FileMaker Pro Database | Average | |
| .fo | XSL-FO Form | Average | |
| .fob | Dynamics NAV Object Container File | Average | |
| .fol | PFS First Choice Database File | Rare | |
| .fop | InfoZoom Protected Data File | Average | |
| .fox | InfoZoom Data File | Average | |
| .fp | FileMaker Pro Spreadsheet | Average | |
| .fp3 | FileMaker Pro 3 Database | Average | |
| .fp4 | FileMaker Pro 4 Database | Average | |
| .fp5 | FileMaker Pro 5 Database | Average | |
| .fp7 | FileMaker Pro 7+ Database | Average | |
| .fpsl | FileMaker Pro Snapshot Link | Average | |
| .frl | Electronic Form Loader | Average | |
| .frm | ADL Form | Average | |
| .frm | MySQL Database Format File | Average | |
| .fro | dBASE IV Compiled Report | Average | |
| .frx | FoxPro Report | Average | |
| .fsb | FMOD Sample Bank File | Average | |
| .fsc | Practical Scriptwriter File | Average | |
| .ftm | Family Tree Maker for DOS File | Average | |
| .ftw | Family Tree Maker File | Average | |
| .gan | GanttProject Project File | Average | |
| .gbr | Gerber File | Average | |
| .gc | GraphClick File | Average | |
| .gcx | Grapher Graph File | Average | |
| .gdb | InterBase Database File | Uncommon | |
| .ged | GEDCOM Genealogy Data File | Average | |
| .gedcom | GEDCOM Genealogy File | Average | |
| .gen | ArcView ARC/INFO UnGenerate file | Uncommon | |
| .ggb | GeoGebra Document | Average | |
| .gml | Geography Markup Language File | Average | |
| .gms | Gesture and Motion Signal File | Average | |
| .gno | GenoPro Genealogy Tree File | Average | |
| .gnp | GNPeak Output File | Rare | |
| .gp3 | Guitar Pro 3 File | Average | |
| .gpi | Garmin Point of Interest File | Common | |
| .gps | Survey Pro Coordinate File | Average | |
| .gpx | GPS Exchange File | Common | |
| .gra | Microsoft Graph File | Average | |
| .grade | GradeStat Document | Average | |
| .grf | Generic Graph File | Average | |
| .grf | DPlot Graph File | Average | |
| .grib | Gridded Binary File | Average | |
| .grk | Gradekeeper Class Gradebook File | Average | |
| .grr | Gradekeeper Class Roster File | Average | |
| .grv | Office Groove File | Average | |
| .gs | GemStone Document | Average | |
| .gst | MapInfo Geoset File | Average | |
| .gtp | Guitar Pro File | Average | |
| .gwk | GraphiCode PCB Job File | Average | |
| .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 | |
| .hcp | HydroCAD Project File | Common | |
| .hcr | HydroCAD Rainfall Curve Data File | Average | |
| .hcu | Hydrograph Units Definitons File | Average | |
| .hda | HotDocs Auto-Assemble File | Average | |
| .hdb | HansaWorld Database File | Average | |
| .hdf | Hierarchical Data Format File | Common | |
| .hdi | HotDocs Auto-Install File | Average | |
| .hdl | HotDocs Library | Average | |
| .hif | Quicken Online File | Average | |
| .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 | |
| .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 | |
| .ib | InterBase Database | Average | |
| .ics | iCalendar File | Average | |
| .id2 | Windows Live Messenger Emoticon File | Common | |
| .idx | HMI Historical Log Index File | Average | |
| .idx | Navigation POI File | Average | |
| .igc | Anime List Builder Input File | Average | |
| .ihx | IN-HEH Timeline Database | Average | |
| .ii | Axialis IconWorkshop Extended Information File | Common | |
| .iif | Intuit Interchange Format File | Average | |
| .img | Garmin Map File | Uncommon | |
| .imt | My Time Data File | Average | |
| .ink | Mimio Ink Data File | Uncommon | |
| .inp | ABAQUS Input File | Average | |
| .ins | Inspiration File | Common | |
| .ip | IconPackager Theme File | Average | |
| .irock | intelliRock Sensor Data File | Average | |
| .irr | Brewer Lamp File | Uncommon | |
| .irx | Brewer Irradiation File | Rare | |
| .isf | Inspiration Flowchart Document | Average | |
| .itdb | iTunes Database File | Average | |
| .itl | iTunes Library File | Average | |
| .itm | iThink Model File | Average | |
| .itn | TomTom Navigator Itinerary File | Average | |
| .itw | InTouch With Database File | Average | |
| .itx | ITX Form Template | Average | |
| .ivt | Beyond 20/20 Table | Average | |
| .iw | Chain Engineering Database File | Uncommon | |
| .ixb | Ulead Disc Image | Average | |
| .jasper | JasperReports Data File | Average | |
| .jdb | Symantec Endpoint Protection Update File | Common | |
| .jef | Janome Embroidery Format | Average | |
| .jmp | JMP Data File | Average | |
| .jnt | Windows Journal File | Common | |
| .job | MetaCAM Nest Job 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 | |
| .kdb | Keypass Database File | Average | |
| .kid | Kidspiration Document | Average | |
| .kismac | KisMAC Webservice File | Average | |
| .kmz | Google Earth Placemark File | Common | |
| .kpf | Komodo Project File | Average | |
| .kpp | Kid Pix Presentation | Average | |
| .kpr | KPresenter Presentation | Average | |
| .kpx | Kid Pix Picture | Average | |
| .kpz | Komodo Template File | Average | |
| .l | Game of Life File | Average | |
| .l6t | Line 6 Tone File | Average | |
| .laccdb | Microsoft Access Lock File | Average | |
| .lbl | NiceLabel Template File | Average | |
| .lbx | FoxPro Label File | Uncommon | |
| .lcd | ABBYY Language File | Average | |
| .lcf | ArchiCAD Library Container File | Average | |
| .lcm | Lipikar Custom Map File | Average | |
| .ldif | LDAP Data Interchange Format File | Average | |
| .lex | Adobe Linguistic Library Data File | Uncommon | |
| .lgc | SimpleK Database File | Average | |
| .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 | Logos Library System File | Average | |
| .lix | ExtendSim Simulation Software Library | Average | |
| .llb | LabVIEW Library File | Average | |
| .lms | LenMus Score File | Average | |
| .lmx | Landmark Exchange File | Average | |
| .lnt | LiveNote Case File | Uncommon | |
| .loc | GPS Location File | Average | |
| .lp7 | LP7 Digitally Signed 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 | |
| .lw4 | Lightwright File | Average | |
| .ly | LilyPond File | Average | |
| .m | Mathematica Input File | Common | |
| .mag | Magic Circuit Layout | Average | |
| .mai | Microsoft Mail File | Average | |
| .map | Weather Defender Map | Average | |
| .masseffectprofile | Mass Effect Player Profile | Common | |
| .mat | MATLAB MAT-File | Common | |
| .mbb | ManaBook Book File | Rare | |
| .mbf | Microsoft Money Backup File | Average | |
| .mbg | Mailbag Assistant Mailbox File | Average | |
| .mbg | Microsoft Mailbag | Average | |
| .mbl | Logger Pro Data File | Average | |
| .mbp | Mobipocket Notes File | Average | |
| .mbx | Outlook Express Mailbox | Average | |
| .mc1 | MedCalc Data File | Average | |
| .mc9 | Mastercam 9 Geometry File | Average | |
| .mcd | Mathcad Document | Average | |
| .md | Moneydance Financial Data File | Average | |
| .mdb | Microsoft Access Database | Very Common | |
| .mdc | Multi Dimension Cube File | Average | |
| .mdf | Measurement Data Format File | Average | |
| .mdf | SQL Server Database File | Average | |
| .mdl | Simulink Model File | Average | |
| .mdl | Rational Rose Model File | Average | |
| .mdm | HLM Multivariate Data Matrix File | Average | |
| .mdn | Blank Access Database Template | Average | |
| .mdt | Access Database Template | Average | |
| .mdx | Multiple Index File | Average | |
| .mdx | Rational XDE Model File | Average | |
| .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 | |
| .mfo | Perl ModInfo Descriptor File | Average | |
| .mfp | Macromedia FlashPaper Document | Average | |
| .mgc | MGCSoft Equation Illustrator File | Average | |
| .mls | Milestones Simplicity File | Average | |
| .mm | FreeMind Mind Map | Average | |
| .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 | |
| .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 | |
| .mpd | Microsoft Project Database | Average | |
| .mpj | Minitab Project File | Average | |
| .mpp | Microsoft Project File | Common | |
| .mpt | Microsoft Project Template | Average | |
| .mpx | Microsoft Project Exchange File | Average | |
| .mpz | Miradi Project File | Average | |
| .mq4 | MetaTrader Custom Indicator | Average | |
| .ms10 | Multisim Circuit Design | Uncommon | |
| .mth | Derive Math File | Average | |
| .mtw | Minitab Worksheet File | Average | |
| .mud | Textease Multi User Database | 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 | |
| .mxd | ArcGIS Map Document | Average | |
| .myd | MySQL Database Data File | Average | |
| .myi | MySQL MyISAM Index File | Average | |
| .nb | Mathematica Notebook | Average | |
| .nc | Mastercam Numerical Control File | Common | |
| .ndf | SQL Server Secondary Database File | Average | |
| .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 | |
| .not | Notation File | Common | |
| .notebook | SMART Notebook File | Average | |
| .np | Portfolio NetPublish File | Average | |
| .npl | Nokia Playlist File | Average | |
| .npt | Portfolio NetPublish Template | Average | |
| .nrl | Autonomy Interwoven Link File | Average | |
| .ns2 | Lotus Notes 2 Database | Rare | |
| .ns3 | Lotus Notes 3 Database | Uncommon | |
| .ns4 | Lotus Notes 4 Database | Uncommon | |
| .nsf | Lotus Notes Database | Average | |
| .nsf | Lotus Domino Database | Average | |
| .ntx | Clipper Index File | Uncommon | |
| .numbers | Numbers Spreadsheet File | Common | |
| .nvl | UniChem Results File | Average | |
| .nyf | myBase Database File | Average | |
| .oab | Offline Address Book | Average | |
| .obj | Relocatable Object Code | Average | |
| .odb | ABAQUS Database | Average | |
| .odf | Open Document File | Average | |
| .odp | OpenDocument Presentation | Average | |
| .ods | OpenDocument Spreadsheet | Common | |
| .odx | BizTalk Server Orchestration File | Average | |
| .oeaccount | Windows Mail Account File | Common | |
| .ofc | Open Financial Connectivity File | Average | |
| .ofm | OmniForm Form | Average | |
| .oft | Outlook File Template | Average | |
| .ofx | Open Financial Exchange File | Average | |
| .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 | Average | |
| .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 | |
| .orx | RadiantOne VDS Database Schema | Uncommon | |
| .otf | OpenTuft Tufting Design File | Average | |
| .otl | NoteTab Outline File | Average | |
| .otln | Opal Outline File | Average | |
| .ots | OpenDocument Spreadsheet Template | Average | |
| .out | Output File | Common | |
| .ov2 | TomTom Points of Interest Database | Common | |
| .ova | Octava Musical Score | Average | |
| .ova | Open Virtual Appliance | Average | |
| .ovf | Open Virtualization File | Common | |
| .p96 | Win96 Database File | Average | |
| .p97 | Win97 Database File | Average | |
| .pab | Personal Address Book | Average | |
| .paf | Personal Ancestral File | Uncommon | |
| .pan | Panorama Database File | Average | |
| .pbd | ProBID+ Data File | Uncommon | |
| .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 | Program Database | Very Common | |
| .pdb | Palm Desktop Database File | Common | |
| .pdb | Protein Data Bank File | Average | |
| .pdd | Medtronic Programmer Data File | Average | |
| .pdm | PowerDesigner Database 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 | |
| .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 | |
| .plw | PicoLog Data 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 | Average | |
| .ppf | Transit NXT Pack Project File | Average | |
| .pps | PowerPoint Slide Show | Very Common | |
| .ppsx | PowerPoint Open XML Slide Show | Common | |
| .ppt | PowerPoint Presentation | Very Common | |
| .pptm | PowerPoint Open XML Macro-Enabled Presentation | Common | |
| .pptx | PowerPoint Open XML Document | Very Common | |
| .prc | Mobipocket eBook File | Average | |
| .pre | Lotus Freelance Graphics File | Uncommon | |
| .prf | Plot Station Plot Request File | Rare | |
| .prj | Project File | Average | |
| .prj | AIMMS Project File | Average | |
| .prm | Route 66 Map File | Average | |
| .prs | Harvard Graphics Presentation | Average | |
| .psa | Photoshop Album Catalog | Common | |
| .psf | SPI Proxy Output File | Rare | |
| .psf | PID Script File | Rare | |
| .psf | GPS Prediction Support File | Uncommon | |
| .psm | Prism Document | 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 | |
| .ptm | MapPoint Map File | Average | |
| .ptn | PaperPort Thumbnail File | Average | |
| .ptt | MapPoint Map Template | Average | |
| .ptz | E-Transcript Bundle File | Common | |
| .pvl | Instalit Library | Average | |
| .pwd | Solid Edge Weldment Document | Average | |
| .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 | |
| .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 | |
| .qel | Quicken Electronic Library | Average | |
| .qfx | Quicken Financial Exchange File | Common | |
| .qif | Quicken Interchange Format File | Average | |
| .qpb | Quicken Payroll File | Average | |
| .qpf | Quartus II Project File | Average | |
| .qpf | Quest3D Project | Uncommon | |
| .qph | Quicken Price History File | Average | |
| .qpm | Quick Pallet Maker Input Data | Average | |
| .qpw | Quattro Pro Spreadsheet | Common | |
| .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 | |
| .rdf | Report Definition File | Average | |
| .rdx | Reflex Data File | Rare | |
| .ref | Microsoft Train Simulator Reference File | Uncommon | |
| .ret | BusinessObjects Template | Average | |
| .rf1 | Retirement Forecast File | Average | |
| .rfa | Revit Family File | Average | |
| .rfo | RoboForm File | Average | |
| .rge | Entourage File Archive | Average | |
| .rgn | Garmin Regional Map File | Average | |
| .rgo | RepliGo File | Average | |
| .rmuf | Alpha Five Runtime License File | Rare | |
| .rnq | Renque Model File | Average | |
| .rod | Actuate Report Object Design File | Average | |
| .rog | Roger 2 Input Data File | Average | |
| .roi | Report Object Instance | Common | |
| .roi | Shark Sales System Data File | Average | |
| .rou | Gerber Route File | Average | |
| .rpp | REAPER Project File | Average | |
| .rpt | Crystal Reports File | Average | |
| .rrt | Rhapzode Resource Template | Uncommon | |
| .rsc | Symbian Application Compiled Resource File | Average | |
| .rsd | RealSQLDatabase File | Average | |
| .rsw | R&R SQL Report Writer Report File | Average | |
| .rte | Navigation Route | Average | |
| .rte | Revit Project Template | 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 | |
| .saf | Street Atlas USA Map File | Common | |
| .sam07 | SAM 2007 Package | Rare | |
| .sar | Sibelius Arrange Style | Average | |
| .sav | SPSS Data File | Average | |
| .sbd | Superbase Data Definition File | Uncommon | |
| .sbf | SmartBroker Data | Average | |
| .sbf | Superbase Database File | Uncommon | |
| .sbq | Superbase QuickReports File | Uncommon | |
| .sbt | Superbase Data Notes File | Rare | |
| .sca | Norton AntiVirus Scan File | Average | |
| .scf | DNA Sequence Chromatogram File | Average | |
| .sch | EAGLE Schematics File | Average | |
| .sdb | OpenOffice.org Base Database File | Very Common | |
| .sdb | ServerBoss Database File | Average | |
| .sdb | MonKey Office SQLite Database File | Average | |
| .sdc | OpenOffice.org Calc Spreadsheet | Common | |
| .sdf | Standard Data File | Very Common | |
| .sdf | SQL Server Compact Database File | Average | |
| .sdf | Spatial Data Format File | Common | |
| .sdp | Session Description Protocol File | Average | |
| .sdq | SAS Data File | Average | |
| .sds | OpenOffice.org Chart | Average | |
| .sds | SDS Apps Data File | Uncommon | |
| .sen | SenTest Data File | Average | |
| .seo | SEO Note File | Average | |
| .seq | DNA Sequence Text File | Average | |
| .ser | GeneMapper Project File | Uncommon | |
| .sgml | Standard Generalized Markup Language File | Average | |
| .sgn | Slax Boot File | Uncommon | |
| .shp | ESRI Shapefile | Average | |
| .shs | Microsoft Scrap File | Rare | |
| .shx | Shapefile Index File | Average | |
| .skc | SideKick Card File | Rare | |
| .skv | Semicolon Separated Values File | Average | |
| .skv | XLANG Schedule Drawing File | Average | |
| .skx | XLANG Schedule File | Average | |
| .sle | Sisulizer Package File | Average | |
| .slk | Symbolic Link File | Uncommon | |
| .slp | Sisulizer Project File | Average | |
| .snapfireshow | Corel SnapfireShow File | Average | |
| .sonic | DigitalMedia Project File | Rare | |
| .soundpack | SoundPackager Sound Package | 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 | |
| .sql | Structured Query Language Data | Very Common | |
| .sqlite | SQLite Database File | Average | |
| .sqr | SQL Program File | Average | |
| .sta | ABAQUS Status File | Average | |
| .stc | StarOffice Calc Spreadsheet Template | Average | |
| .stf | Exchange 2000 Server Temporary File | Uncommon | |
| .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 | Streets & Trips Map Template | Average | |
| .stw | STATISTICA Workbook | Average | |
| .styk | Stykz Stick Figure | Average | |
| .stykz | Stykz Animation | Average | |
| .swk | StudyWorks Save File | Average | |
| .sxc | StarOffice Calc Spreadsheet | Average | |
| .sxi | StarOffice Impress Presentation | Average | |
| .sy3 | Harvard Graphics Symbol File | Rare | |
| .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 | |
| .t2 | Textease 2000 File | Uncommon | |
| .t3001 | TARGET 3001! Circuit Design Project File | Average | |
| .tax2008 | TurboTax 2008 Tax Return | Average | |
| .tax2009 | TurboTax 2009 Tax Return | Common | |
| .tb | Tabbery Tab File | Average | |
| .tbk | ToolBook File | Average | |
| .tbl | StarCraft Information Table | Average | |
| .tcc | TimeCalc Classic Data File | Average | |
| .tcx | Training Center Database File | Average | |
| .tda | Palm To-Do File | Average | |
| .tda | Java Application Thread Dump | Average | |
| .tdl | Tab Delineated Format File | Uncommon | |
| .tdm | LabVIEW Binary Measurement File | Average | |
| .tdt | FirstBreak Concrete Test File | Uncommon | |
| .tdt | THOR Data Tree File | Average | |
| .te | Textease CT Database File | Common | |
| .te3 | WinTrack Object File | Average | |
| .teacher | Senteo Teacher Database File | Uncommon | |
| .tef | TablEdit Tablature | Average | |
| .tet | Textease CT Template | Average | |
| .tfa | TreeSoft CashFlow Analysis Data File | Average | |
| .tfd | Tape Format Requirements Document | Average | |
| .tfrd | Tape Image Format Requirements Document | Average | |
| .tjp | TaskJuggler Project File | Average | |
| .tk3 | TK3 Multimedia eBook | Average | |
| .tkfl | TKLinks Saver Favorite Links File | Average | |
| .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 | |
| .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 | Rosetta Stone Language Data | Common | |
| .trs | WinTrack Railroad Track Text File | Average | |
| .trx | Firmware Image File | Uncommon | |
| .trx | WebAuthorize Batch File | Uncommon | |
| .tst | TestPoint Test File | Average | |
| .tsv | Tab Separated Values File | Common | |
| .ttk | Catalyst Translation Toolkit | 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 | |
| .uccapilog | Microsoft UCC API Log File | Common | |
| .ud | OmniPage User Dictionary | Uncommon | |
| .udb | Dynamics AX User Database File | Average | |
| .udeb | Debian Package File | Uncommon | |
| .uds | Uniform Data System File | Uncommon | |
| .uds | Sierra Generations File | Rare | |
| .ulf | Universal List File | Average | |
| .ulz | USBlyzer Data Capture File | Average | |
| .update | ISAPI Update File | Uncommon | |
| .upoi | iGO Points of Interest File | Average | |
| .usr | FileMaker Pro Database File | Average | |
| .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 | |
| .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 | Average | |
| .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 | |
| .vrd | Visio Report Definition File | Average | |
| .vscontent | Visual Studio Content File | Average | |
| .vsx | Visio Stencil XML File | Average | |
| .vtx | Visio Template XML File | Average | |
| .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 | |
| .wdb | Microsoft Works Database | Average | |
| .wdq | Offline Explorer Queue File | Uncommon | |
| .wea | Ecotect Weather File | Average | |
| .wfd | Wayfinder Map File | Rare | |
| .wfm | dBASE Form | Uncommon | |
| .wgp | Web Gallery Project | Average | |
| .wgt | XNBC Synaptic Weights File | Average | |
| .wgt | IMPS Data 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 | |
| .wks | Works Spreadsheet | Very Common | |
| .wks | Lotus 1-2-3 Spreadsheet | Uncommon | |
| .wku | Lotus 1-2-3 Spreadsheet | Average | |
| .wlmp | Windows Live Movie Maker Project File | Common | |
| .wmdb | Windows Media Database File | Average | |
| .wor | MapInfo Workspace File | Average | |
| .wpc | Pazzles Cutting File | Uncommon | |
| .wpc | WordPad Converter File | Average | |
| .wpf | WordPerfect Form | Average | |
| .wpo | HOLUX Waypoint File | Uncommon | |
| .wpo | Technopress Waypoint 2D File | Rare | |
| .wq1 | Quattro Pro for DOS Spreadsheet File | Rare | |
| .wq2 | Quattro Pro for DOS Spreadsheet File | Rare | |
| .wtb | Win-Test Binary Log File | Average | |
| .wtr | Encarta File | Rare | |
| .xbk | SMART Notebook File | Uncommon | |
| .xdb | PowerDesigner Database Definition File | Average | |
| .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 | XFD File | Uncommon | |
| .xfo | XSL-FO Formatted Form | Average | |
| .xft | Adobe Form Designer 5.0 File | Average | |
| .xl | Excel Spreadsheet | Uncommon | |
| .xlc | Excel Chart | Average | |
| .xlgc | ExpressK Database File | Uncommon | |
| .xlr | Works Spreadsheet | Common | |
| .xls | Excel Spreadsheet | Very Common | |
| .xlsb | Excel Binary Spreadsheet | Average | |
| .xlsm | Excel Open XML Macro-Enabled Spreadsheet | Average | |
| .xlsx | Microsoft Excel Open XML Document | Very Common | |
| .xlt | Excel Template | Average | |
| .xltm | Excel Open XML Macro-Enabled Spreadsheet Template | Common | |
| .xltx | Excel Open XML Spreadsheet Template | Common | |
| .xlw | Excel Workbook | Average | |
| .xmcd | Mathcad Worksheet 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 | |
| .xpm | Micro Planner Manager File | Average | |
| .xpt | SAS Transport File | Average | |
| .xrp | RationalPlan Project File | Average | |
| .xsl | XML Style Sheet | Common | |
| .xslt | XSL Transformation | Average | |
| .xsn | InfoPath Form Template File | Uncommon | |
| .xtm | Xtremsplit Data File | Average | |
| .xtm | CmapTools Exported Topic Map | Uncommon | |
| .xtp | XTree Data File | Rare | |
| .xxd | Brixx Planner Calendar | Rare | |
| .yam | Yahoo! Auctions Data | Average | |
| .zap | Zone Alarm Pro Data File | Average | |
| .zdb | Quicken Online File | Average | |
| .zdb | EPSQ Database | Average | |
| .zdc | CD Catalog Expert Database File | Average | |
| .zix | Quicken Online File | Average | |
| .zmc | ZoneAlarm Quarantine File | Average | |
| .zpl | Zoom Player Play List | Average | |
| .^^^ | Pervasive.SQL Database File | Uncommon | |
| .{pb | Corel WordPerfect Document Index File | Rare | |
| .~hm | HostMonitor TestList Backup File | Uncommon |
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