| .d | D Programming Language Source Code Format |
| .d00 | Adlib/Edlib Sound Format |
| .d01 | MicroSim PCBoard NC Drill Data Format |
| .d02 | MicroSim PCBoard NC Drill Data |
| .d03 | MicroSim PCBoard NC Drill Data |
| .d05 | MicroSim PCBoard NC Drill Data |
| .d07 | MicroSim PCBoard NC Drill Data |
| .d08 | DeductionPro 2008 |
| .d1 | Progress Database |
| .d10 | IRIG 106 Recording Directory |
| .d11 | Macro Mania Data |
| .d2 | Progress Database |
| .d2a | Avisynth MPAsource Plugin Scan |
| .d2ct | Disinfectant For Mac |
| .d2h | Diablo II Hack It Module |
| .d2i | ATMA Diablo II |
| .d2p | Diablo 2 Packet |
| .d2s | Diablo II Saved Map Seed Data Format |
| .d2v | DVD2AVI Format |
| .d2x | Diablo 2 Stash |
| .d32 | Lotus Visualisation |
| .d3c | Descent |
| .d3d | Corel Dream 3D Drawing Format |
| .d3dbsp | Call Of Duty Modern Warfare 2 Map Format |
| .d3m | Descent Game |
| .d3s | Nikon Image Format |
| .d3v | Datel Video Format |
| .d3x | Nikon Image Format |
| .d4 | Dataphor Source |
| .d43 | IAR Debug |
| .d5p | Dragon UnPACKer Language Pack |
| .d64 | Commodore Emulator Format |
| .d67 | VICE Disk Image |
| .d71 | Commodore Emulator |
| .d80 | Commodore CBM-8050 Diskette Emulator Image |
| .d81 | Commodore VC-1581 Diskette Emulator Image |
| .d82 | Commodore Emulator |
| .d88 | Toshiba Pasopia 7 Disk Format |
| .da | DAwin Project |
| .da$ | Microsoft Compressed DAT |
| .da0 | Microsoft Windows 9x Registry Backup Format |
| .da1 | Windows Registry Backup |
| .da2 | DeepAnalysis 2 EBay Auction Data |
| .da3 | Star Trek Generations Saved Game |
| .da4 | SeeYou Waypoint |
| .da5 | Star Trek Generations Saved Game |
| .da6 | Star Trek Generations Saved Game |
| .da7 | Star Trek Generations Saved Game |
| .da8 | Star Trek: Generations Saved Game |
| .da9 | Star Trek Generations Autosave Game |
| .daa | PowerISO Direct-Access-Archive Format |
| .daap | Apple DAAP Playlist |
| .dab | OrangeCD Catalog Database |
| .dabriefcase | RemObjects Data Abstract File Briefcase |
| .dac | Dynacom Accounting Data |
| .daconfig | RemObjects Data Abstract Configuration Format |
| .daconnections | RemObjects Data Abstract Connections Format |
| .dacpac | Database Deployment Format |
| .dad | RemObjects Data Abstract Driver Format |
| .dad2 | Canvas For Mac |
| .dadiagrams | RemObjects Data Abstract Data Diagrams Format |
| .dadx | Eclipse Document Access Definition Extension |
| .dae | Collada 3D Digital Asset Format |
| .daemonscript | Daemon Tools Script |
| .daf | Digital Anchor Data Format |
| .dag | Dagra Document |
| .dah | AutoPlay Media Studio Splash Image |
| .dai | Dream Aquarium Patch |
| .dal | DVD-lab Project Format |
| .dam | DeltaMaster Analysis Model Format |
| .dan | D-MAS Analysis System Patient |
| .dao | Disk At Once CD/DVD Image Format |
| .dap | Download Accelerator Partial Download Format |
| .dapf | DinkeyAdd Parameter |
| .daproj | DivX Author Project |
| .daq | Data Acquisition Toolbox |
| .dar | DAR Disk Archive |
| .dart | Apple Mac OS X DiskImageMounter DART Image |
| .dartclip | Dartfish Metadata |
| .das | DeltaMaster Analysis Session Format |
| .daschema | Data Abstract Database Schema Format |
| .dash | Dashlane Profile |
| .dat | Program Data Format |
| .dat-shm | EmClient Data |
| .dat2 | XYplorer Thumbnail Cache |
| .data | Analysis Studio Offline Data Format |
| .datacontract | Web Service Software Factory Installer |
| .datasource | Microsoft Visual Studio Data Source |
| .datbak0 | Miranda Data File Backup |
| .dat_mcr | Minecraft Backup Format |
| .dat_new | Minecraft Level Format |
| .dat_old | Minecraft Backup Format |
| .dat_tureg_old | Windows Registry |
| .dau | Express Dictate Dictate Record |
| .dav | Mace DVR-1600HP Video Format |
| .dawg | Eliot Dictionary |
| .dax | Compressed CD Image Format |
| .day | Day Of The Zombie Map Format |
| .DayZProfile | DAYZ Profile |
| .daz | DAZ Studio Format |
| .dazip | Dragon Age Origins Game Format |
| .da_ | GKSetup Support |
| .db | Database Format |
| .db$ | DBASE Temporary |
| .db- | Norton Nprotect Database Format |
| .db-journal | SQLite Database Journal |
| .db-shm | Google Android SQLite Temporary Database Format |
| .db-wal | Google Android SQLite Temporary Database Format |
| .db0 | S.T.A.L.K.E.R. Game |
| .db1 | S.T.A.L.K.E.R. Game Format |
| .db2 | DBASE II Database Format |
| .db2ind | Microsoft Visual Studio DB2 Index |
| .db2mov | DeepDVD Movie Authoring Project |
| .db2p | IBM Database Project |
| .db2sp | Microsoft Visual Studio DB2 Create Procedure Statement |
| .db2tbl | Microsoft Visual Studio DB2 Table Script |
| .db2tr | Microsoft Visual Studio DB2 Trigger Script |
| .db2udf | Microsoft Visual Studio DB2 User Defined Function |
| .db2vw | Microsoft Visual Studio DB2 View Script |
| .db3 | Database Format |
| .db3-journal | SQLite Temporary Database Journal |
| .db4 | Paychex Payroll Database |
| .db5 | S.T.A.L.K.E.R. Game |
| .db6 | S.T.A.L.K.E.R. Game |
| .db7 | S.T.A.L.K.E.R. Game |
| .db8 | S.T.A.L.K.E.R. Game |
| .db9 | S.T.A.L.K.E.R. Game |
| .dba | Palm Desktop For Windows Format |
| .dbag | WinSQL DataBag |
| .dbat | Quicken For Mac Data |
| .dbb | Skype User Data Format |
| .dbc | OrCAD Capture CIS Database Configuration Format |
| .dbd | DemoShield Project Format |
| .dbf | Common Database Format |
| .dbg | Debug Format |
| .dbgsym | Debug Symbols Format |
| .dbh | CodeWarrior Debug Preferences |
| .dbheader | Download Boost Header |
| .dbi | FIFA World Cup Game Data Comin Fe |
| .dbk | OrCAD Schematic Capture Backup Format |
| .dbl | DAZ Brick Light Format |
| .dblib | Altium Designer Database Library |
| .dblink | Altium Designer Database Link |
| .dbm | Adobe ColdFusion Template Format |
| .dbmanifest | Database Manifest |
| .dbmc | Netscape Cache Log |
| .dbmdl | Microsoft Visual Studio Database Project |
| .dbmg | Netscale Navigator History |
| .dbml | Microsoft Visual Studio Object Relational OR Designer Format |
| .dbnw | Netscape News |
| .dbnx | Netscape For Mac Host |
| .dbo | DarkBASIC Source Code Format |
| .dbp | Microsoft Visual Studio Visual C++ Database Project |
| .dbpf | Maxis Database Packed Format |
| .dbpro | DarkBASIC Project Format |
| .dbproj | Microsoft Visual Studio Visual C++ Database Project Format |
| .dbq | Paradox Memo Format |
| .dbr | DeepBurner Burn List Format |
| .dbs | SQL Structured Query Language Database Command Format |
| .dbschema | Database Schema |
| .dbt | Database Text Memo Format |
| .dbv | Database Variable Field |
| .dbw | Microsoft Windows Database |
| .dbx | Microsoft Outlook Express E-mail Folder Format |
| .dbz | DB Zipper Compressed Database |
| .dc | DesignCAD CAD Format |
| .dc0 | OpenBSD |
| .dc1 | Bloomba E-mail Message Format |
| .dc2 | Kodak DC25 Digital Camera Format |
| .dc3 | Medicine Image Format Format |
| .dc4 | ViaThinkSoft (De)Coder Format |
| .dc42 | Apple Disk Copy 4.2 Disk Image |
| .dc5 | DataCAD Drawing Format |
| .dc6 | Diablo 2 Static Image |
| .dca | DisplayWrite Document |
| .dcb | Concordance Database Control Block Format |
| .dcc | Diablo 2 Animation |
| .dcd | DesignCAD Drawing Format |
| .dcdc | Astound Presentation |
| .dce | Drivecam Video File Format |
| .dcf | DRM Content Format Delivery Format |
| .dcg | HSFX Map |
| .dck | Resolume Deck Format |
| .dcl | DumpSec Format |
| .dcls | CATIA V4 Settings |
| .dcm | Dicom Medicine Image File Format |
| .dcmd | DiskCatalogMaker Catalog Database Format |
| .dcmf | DiskCatalogMaker Catalog |
| .dcn | Autodesk Depth Slope Definition |
| .dco | DisCryptor Encrypted Archive |
| .dcover | BeLight Disc Cover Format |
| .dcp | Delphi Component Package Format |
| .dcpf | Roxio Disc Copier Project Format |
| .dcpil | Delphi Compiler Symbolic Information |
| .dcpr | Adobe Photoshop DNG Digital Negative Camera Profile Recipe Format |
| .dcproj | Dashcode Project |
| .dcpy | Disk Copy |
| .dcr | Kodak Digital Camera Raw Image Format |
| .dcs | QuarkXPress Desktop Color Separation Format |
| .dcst | Adobe InDesign Format |
| .dct | Spell Checking Dictionary Format |
| .dct5 | Microsoft Word 5 For Mac Dictionary |
| .dctmp | DC++ Partially Downloaded Format |
| .dctx | Microsoft Office IME Open Extended Dictionary |
| .dctxc | Microsoft Office IME Open Extended Dictionary |
| .dcu | Delphi Compiled Unit Format |
| .dcuil | Delphi Compiled Unit Format |
| .dcv | DriveCrypt Encrypted Volume |
| .dcx | Microsoft Visual FoxPro Database Container (DBC) |
| .dd | Doodle C64 Image Format |
| .dd2 | Dungeon Designer 2 Map Design |
| .dd3 | Blood Bowl Game |
| .dda | TNTmips Import |
| .ddap | DiskDoubler Compressed |
| .ddat | DivX Web Player Temporary Download Format |
| .ddb | Device Dependent Bitmap Graphics Format |
| .ddc | DivX Descriptor DVD Description Format |
| .ddcx | DivX Descriptor 2 Format |
| .ddd | Adobe Distiller Format |
| .dde | Dynamic Data Exchange |
| .ddf | Diamond Directive Format |
| .ddj | Silkroad Alchemy Page |
| .ddk | IBM OS/2 Saved SKF |
| .ddl | SQL Data Definition Language Format |
| .ddm | Alpha Five Table Objects |
| .ddoc | DigiDoc Client Container |
| .ddp | Delphi Diagram Page From Compiler |
| .ddpokersave | DD Poker Save Game |
| .ddr | DDRemote Parameter |
| .ddrw | Apple ClarisDraw Draw Format |
| .dds | DirectDraw Surface Format |
| .ddsx | Stronghold Kingdoms Data |
| .ddt | Jill Of The Jungle Game Format |
| .ddx | Alpha Five Data Dictionary Index |
| .ddz | Adaptec Unix Driver |
| .de | German Language Translation |
| .deb | Debian Linux Package Format |
| .debian | Debian Related |
| .dec | VersaPro Declaration Format |
| .deck | Microsoft Office For Mac Query |
| .decrypt | Microsoft Windows 8 Decrypted ESD Format |
| .ded | Dr. Engrave Document Format |
| .dee | Creator Simulator Description |
| .def | Definition Format |
| .definition | Apple Mac OS X Automator Data Type Definition |
| .deform | FontTwister Deform Guide Line |
| .dek | Magic The Gathering Deck Format |
| .del | Apple Safari |
| .delf | Malicious Or Virus |
| .dem | Recorded Game Format |
| .demo | VirtuaGirl HD Model Demo |
| .demo4 | UT2004 Demo |
| .deny | Linux Access |
| .dep | Microsoft Visual Basic Setup Wizard Dependency Format |
| .depend | Code::Blocks Project Support Format |
| .deploymentoptions | SQL Server Deployment Options |
| .deploymenttargets | SQL Server Deployment Target |
| .deproj | Disketch Project Format |
| .der | DER Encoded Internet Security Certificate Format |
| .des | CorelDRAW Corel Designer Technical Illustration Format |
| .des-se | Sony Ericsson XPERIA X10 |
| .desc | Description Format |
| .description | Multilizer PDF Translator Description |
| .design | Microsoft Expression Design Drawing Format |
| .desklink | Desktop Shortcut |
| .deskthemepack | Microsoft Windows 8 Theme Pack Format |
| .desktop | DesktopX Windows Desktop Theme Format |
| .dess | Microsoft Device Emulator Saved State |
| .det | ACT! Format |
| .deu | Adobe Reader German Language |
| .dev | Windows Device Driver Format |
| .developerprofile | Apple Xcode Developer Profile Format |
| .develve | Develve Format |
| .deviceids | Apple IOS Device Identification Format |
| .deviceinfo | Apple IPhone Configuration Utility Format |
| .devicemanifest-ms | Microsoft Windows Device Metadata |
| .devicemetadata-ms | Microsoft Windows 7 Device Metadata Package |
| .devicesalt | Nook Encrypted Format |
| .devpak | Dev-C++ Developer Package |
| .devx | E-sword Devotional |
| .dewf | SoundCap, SoundEdit Recorded Instrument |
| .dex | Google Android Compiled Executable Format |
| .dexe | Microsoft Virtual PC For Mac Executable |
| .dez | DeZign For Databases Project |
| .df | Corel Paradox Table Filter |
| .df1 | Omnis7 And Omnis Studio Database File Format |
| .df10 | IRIG 106 Recording Directory |
| .df2 | Omnis7 And Omnis Studio Database File Format |
| .df3 | Omnis7 And Omnis Studio Database |
| .df4 | Omnis7 And Omnis Studio Database |
| .df6 | Omnis7 And Omnis Studio Database |
| .df7 | Omnis Studio Database |
| .dfb | Data Flask Formula |
| .dfc | Defractor Instrument Format |
| .dfe | RISC OS Comma Separated Value |
| .dff | RenderWare Model Format |
| .dfg | Data Flask Grid Format |
| .dfh | SONAR Kit |
| .dfk | Dark Flow Project Format |
| .dfl | OLE2 Doc |
| .dfm | Delphi Win32 Form Format |
| .dfn | Delphi Definition |
| .dfont | Mac OS X Data Fork Suitcase Format |
| .dfp | Eyeon Fusion Plugin Format |
| .dfproj | DVD Flick Project Format |
| .dfq | SmartWare Query Definition |
| .dfr | SmartWare Report Definition |
| .dfs | AutoCAD Utility Defaults Format Format |
| .dft | Solid Edge Drawing Format |
| .dfu | Apple IOS Firmware Update Format |
| .dfv | MS Office Word Print Format Template |
| .dfw | SmartWare Cross-tab Definition |
| .dfx | Drafix CAD Format |
| .dfxp | Timed Text Markup Language |
| .dg | Source Code For A Dialog Box |
| .dg-key | DigiGuide Key |
| .dg3 | DeltaGraph |
| .dgb | FlashCAD Drawing Database Format |
| .dgc | TurboTax Tax Form Format |
| .dgdat | DoubleGIS Database |
| .dgf | GPS Pathfinder Office Geoid Grid |
| .dgi | HDConvertToX Input |
| .dgk | Delcam PowerMILL Format |
| .dgl | DigiGuide Language |
| .dgm | Lotus Freelance Diagram |
| .dgmaker | DigiGuide Marker |
| .dgml | Microsoft Visual Studio Directed Graph Markup Language Format |
| .dgn | MicroStation Design Format |
| .dgnlib | MicroStation Design Library |
| .dgpd | DeltaGraph Document |
| .dgprint | DigiGuide Print Template |
| .dgr | DeltaGraph Document |
| .dgrh | DeltaGraph For Mac |
| .dgs | TES Dagesh Pro Document Format |
| .dgsl | Microsoft Visual Studio Visual Shader Graph Format |
| .dgt | Digital Gallery Format |
| .dgx | IBM Rational XDE |
| .dgz | Dega Saved State |
| .dhcd | DHCD Computing Format |
| .dhe | Microsoft Help Workshop Dialog Box Help Editor Document |
| .dhf | AMIGA Emulator Disk Image ROM |
| .dhs | HyperSnap Drawing |
| .dht | GAUSS Data Set Header Format |
| .dhtml | Dynamic HTML Format |
| .dhw | ACECAD Digimemo Memo |
| .dhy | Adobe Bridge |
| .di | D Programming Language Source Code |
| .dia | DIA Drawing Format |
| .diagcab | Microsoft Windows Troubleshooting CAB Format |
| .diagcfg | Microsoft Windows Troubleshooting Configuration Format |
| .diagpkg | Microsoft Windows Troubleshooting Package Format |
| .dib | Device-Independent Bitmap Graphic |
| .dic | Dictionary Format |
| .dicm | Medicine Image |
| .dicom | Dicom Medicine Image File Format |
| .dicproof | Microsoft Office Dictionary Proofing Format |
| .dict | Sunnysoft InterWrite |
| .did | Adobe Distiller/Bridge |
| .die | Diablo Item |
| .dif | Digital Interface Format |
| .diff | Diff Source |
| .dig | Audio Format |
| .dii | CT Summation Document Image Information Load Format |
| .dil | Delphi |
| .dim | Direct Internet Message Encapsulation DIME Format |
| .dimax | DiMAX Firmware Format |
| .dime | Direct Internet Message Encapsulation Format |
| .dimg | Mac Disk Image |
| .din | DataEase Installation Script |
| .dinerdash2savedgame | Diner Dash 2 Saved Game |
| .dinerdashsavedgame | Diner Dash Saved Game |
| .dinfo | DivX Web Player Temporary Download Format |
| .dip | Windows Bitmap Format |
| .dir | Adobe (Macromedia) Director Format |
| .dir00 | Disk Defrag Error Or Dump |
| .directory | KDE Folder View Properties Format |
| .dis | Oracle Discoverer Workbook Format |
| .disabled | Spybot - Search & Destroy Disabled Format |
| .disc | Toast Document |
| .disco | DISCO Discovery Document |
| .discomap | Microsoft DISCO Discovery Output Format |
| .disk | Linux Virtual Hard Disk Format |
| .diskcopy42 | Apple Disk Copy 4.2 Disk Image |
| .diskdefines | Linux LiveCD Information Format |
| .dist | Apple Mac OS X Installer Distribution Format |
| .dist-rdb | SAM Scoring |
| .distz | Apple Mac OS X Installer Distribution |
| .dit | Microsoft Windows 2000 Active Directory Schema Format |
| .dita | DITA Output Format |
| .ditamap | DITAmap Format |
| .ditaval | DITA Conditions Format |
| .div | DivX Movie |
| .diva | Project DIVA Song Format |
| .divx | DivX Media Format |
| .dix | DIVA-GIS Export Format |
| .diy | My Drivers Backup Format |
| .diz | Description In ZIP Format |
| .dj | DJGPP Docs |
| .dja | DunDjinni |
| .djanimations | Digital Juice Animation |
| .djf | NTI Drive Backup |
| .djg | DJGPP Compiler Makefile |
| .djm | Dynojet Map Format |
| .djprojects | Digital Juice Compressed |
| .djr | Ringtone Media Studio Ringtone Format |
| .djs | NASCAR Thunder 2004 Game Music |
| .djv | DjVu Image Format |
| .djvu | DjVu Image Format |
| .djx | Dundjinni Art |
| .dk@p | DocMaker Standalone Document |
| .dkb | DKBTrace Raytraced Graphics |
| .dkd | Submarine Titans Battle Map |
| .dke | DriveLock FDE Disk Key Format |
| .dklang | DKLang Translation Editor Translation |
| .dkt | DiGiTIAL THUNDER Drum Kit Format |
| .dkz | ZIP Description Text |
| .dl | Zoo Tycoon 2 Game Format |
| .dl0 | Abbyy Finereader 4.0 Sprint |
| .dlb | Troj/Dloadr-AHT |
| .dlc | JDownloader Download Link Container |
| .dlct | AppleScript Dialect |
| .dld | EdLog Compiled Program |
| .dle | 3D Studio Max Plugin |
| .dlf | DataCAD Double Precision Layer |
| .dlg | Digital Line Graph Vector Image Format |
| .dli | Win32.Sober.AD@mm |
| .dlk | Xprotect License Code List |
| .dll | Dynamic Link Library Format |
| .dll1 | ASUS ExpressGate (Splashtop) |
| .dlls | UFO: Alien Invasion Plugin |
| .dllx | Backdoor.Bot |
| .dll_non_opt | Adobe |
| .dll_resp | Microsoft Windows Live Messenger Contact Related |
| .dlm | Akamai Download Manager Format |
| .dlo | 3D Studio Max Plugin Format |
| .dlp | DirectMusic Producer DLS |
| .dlpf | DinkeyLook Diagnostic Information |
| .dls | DownLoadable Sound Format |
| .dlu | 3D Studio Max Utility Plug-in Format |
| .dlv | CATIA Export Format |
| .dlv4 | Catia |
| .dlx | Sony VDU File Format Importer |
| .dlz | Crossword Power Tools Crossword Library |
| .dl_ | Microsoft Windows DLL Backup Format |
| .dm | Paradox Data Model Format |
| .dm1 | ER/Studio Database Model Format |
| .dm2 | Quake II Recorded Game Format |
| .dm3 | Gatan Digital Micrograph Format |
| .dmb | BYOND Byte-code Format |
| .dmc | Datamartist Data Canvas Format |
| .dmd | Oracle SQL Developer Data Modeler Data Format |
| .dmf | Delusion/Xtracker Audio Format |
| .DMFr | Download Master Incomplete Download |
| .dmg | Apple Mac OS X Disk Image Format |
| .dmgpart | Apple Mac OS X UDIF Split Disk Image Format |
| .dmi | DreamMaker Format |
| .dmkit | Drumaxx |
| .dml | DynaScript Markup Language Format |
| .dmm | DropMind Mind Map Format |
| .dmms | DropMind Map Style |
| .dmmx | DropMind XML Map Bundle Format |
| .dmn | SAS Metadata |
| .dmo | Demo Format |
| .dmp | Memory Dump, Screen Dump, Junk Files |
| .dmpatch | Fruity Loops Studio |
| .dmpr | Direct Mail Project Format |
| .dmptrn | Fruity Loops Studio Pattern |
| .dmr | BrainVoyager QX Project Format |
| .dms | Disk Masher Image |
| .dmsa | Roxio Music Disc Creator Project Format |
| .dmsd | Roxio Creator MyDVD DVD Project Format |
| .dmsd3d | Roxio MyDVD 3D Project |
| .dmse | Roxio Sound Editor Project Format |
| .dmsk | DivX Web Player Temporary Download Format |
| .dmsm | Roxio Creator VideoWave Movie Project Format |
| .dmsm3d | VideoWave 3D Movie Project Format |
| .dmsp | Roxio PhotoSuite Project Format |
| .dmss | Roxio Creator VideoWave Slideshow Project Format |
| .dmt | Delphi Menu Template Format |
| .dmtemplate | Direct Mail E-mail Template Format |
| .dmu | DigitalMugician Audio |
| .dmv | Adobe Acrobat Catalog |
| .dmx | Source Filmmaker Project Format |
| .dmx-info | DriverMax Driver Information Format |
| .dmy | SEMIA LTST DB Time Series Data |
| .dm_1 | Call Of Duty Demo |
| .dm_57 | Return To Castle Wolfenstein Demo |
| .dm_68 | Quake 3 Arena Demo Format |
| .dm_82 | Wolfenstein Enemy Territory Demo Format |
| .dm_83 | Wolfenstein Enemy Territory Demo Format |
| .dm_84 | Wolfenstein Enemy Territory Demo Format |
| .dn1 | Duke Nukem Episode 1 Game Format |
| .dn2 | Duke Nukem Episode 2 Game Format |
| .dn3 | Duke Nukem Episode 3 Game Format |
| .dna | CA Backup And Migration Backup Format |
| .dnc | Microsoft Windows XP Dancers Dancer Database Format |
| .dnd | ClustalW2 Tree |
| .dne | Netica Bayesian Network Text Format |
| .dnf | Duke Nukem Forever Map Format |
| .dng | Adobe Digital Negative Format |
| .dnh | Touhou Danmakufu Game Script Format |
| .dni | RealMyst 3D Game Archive |
| .dnl | DNAML EBook Format |
| .dnn | DotNetNuke Manifest |
| .dnp | DRM Digital Rights Management |
| .dns | DynSite Plug-in File |
| .dnt | RSNetWorx Project |
| .dnx | IBM Rational Software |
| .do | Java Servlet Format |
| .do2 | Resident Evil 2 Door |
| .do7 | DOS 7 |
| .dob | Microsoft Visual Basic User Document Form Format |
| .doc | Microsoft Word 97 To 2003 Document Format |
| .doc# | Microsoft Word 97 To 2003 Document Format |
| .docc | DragThing Color Settings |
| .docenx | Egis Encrypted Word DOC |
| .dochtml | Microsoft Word HTML Document Format |
| .dock | DragThing Dock |
| .docklet | ObjectDock Docklet |
| .dockzip | Stardock ObjectDock Format |
| .docm | Microsoft Word 2007/2010 Open XML Macro-enabled Document Format |
| .docmhtml | Microsoft Word MIME HTML Document Format |
| .docset | Doxygen Source Code Documentation Format |
| .docstates | Microsoft Visual Studio Document Tab Well |
| .docx | Microsoft Word 2007/2010 Open XML Document Format |
| .docxenx | Egis Encrypted Word DOCX |
| .docxml | Microsoft Word XML Document |
| .docz | ThinkFree Online Note Document |
| .doe | Rockwell Arena Model |
| .dof | DOSBox Capture Movie |
| .doh | Geoworks GEOS Dependency Information |
| .doi | BiRT Data Object Instance |
| .dok | ASCII Text |
| .dol | Nintendo GameCube Executable Format |
| .dolphinview | Dolphin For KDE Folder View Settings Format |
| .don | OpenOffice.org Log |
| .done | Cygwin Post-install |
| .donotpresent | Apple Mac OS X Time Machine Resource Fork |
| .doo | Atari Doodle Image |
| .dop | Digital Orchestrator Pro |
| .dor | Digita Organiser |
| .dos | WIN95/ DOS 7 System |
| .DoST | DoStudio Subtitle Format |
| .dot | Microsoft Word 97 To 2003 Document Template Format |
| .dothtml | Microsoft Word HTML Document Template Format |
| .dotm | Microsoft Word 2007/ 2010 Open XML Macro-enabled Document Template Format |
| .dotmenx | Egis Encrypted Word DOTM |
| .dotx | Microsoft Word 2007 Or Word 2010 XML Document Template Format |
| .dotxenx | Egis Encrypted Word DOTX |
| .dov | Temporary Format |
| .download | Chrome Partial Download Format |
| .downloaded | ICQ 6 Hash |
| .downloadhost | MSN Explorer Download View |
| .downloading | Pando Incomplete Download Format |
| .dox | MultiMate Document Format |
| .doxy | Doxygen |
| .dp | Text |
| .dp1 | DataPower Database Format |
| .dpa | Serif DrawPlus Animation Format |
| .dpb | DataPilot Database Format |
| .dpc | Microsoft Office Resource |
| .dpcache | Apple IPhoto Cache |
| .dpd | Ovation Pro Document |
| .dpe | DPwinEHE Project |
| .dpf | F-Secure Default Policy Format |
| .dpg | NDs-mPeG Video Format |
| .dpi | Adlib Express Document Processing Information Settings |
| .dpj | Borland Delphi Project |
| .dpk | Delphi Package Source Format |
| .dpkw | Delphi Package Source Format |
| .dpl | Delphi Packed Library Format |
| .dplt | AppleScript Droplet |
| .dpm | Pro Tools Plugin Format |
| .dpn | Depiction Format |
| .dpo | DECAdry Express Business Cards Business Card |
| .dpp | Serif DrawPlus Drawing Format |
| .dpq | Clarion |
| .dpr | Delphi Project Format |
| .dprj | VideoReDo TVSuite DVD Project |
| .dpro | MacDraw Pro |
| .dproj | Delphi Project Format |
| .dps | DivX Player Skin |
| .dpt | Kingsoft Presentation Template |
| .dpv | Siemens NX Drafting Standard Format |
| .dpx | Digital Moving Picture Exchange Bitmap Format |
| .dqa | Daqarta Extended WAV Data |
| .dql | DataEase Database |
| .dqy | Microsoft Excel ODBC Query Format |
| .dr | OMA Open Mobile Alliance DRM Rights Object Format |
| .dr3 | V-Control Import Driver |
| .dr3d | CorelDream 3D Graphics |
| .dr4 | AllyCAD Drawing |
| .dr8 | DR-008 Drumkit |
| .dra | OrCAD PCB Drawing Format |
| .draw | Acorn Vector Draw |
| .drawing | Artboard Drawing Format |
| .drawit | DrawIt Drawing |
| .drb | Dr. Beam |
| .drc | OMA Open Mobile Alliance DRM Rights Object Format |
| .drd | Allen & Heath PL Designer Document |
| .dre | DReport Exported Report |
| .dream | DreamMaker Animated Wallpaper Format |
| .dreamchroniclessavedgame | Dream Chronicles Saved Game |
| .dres | Delphi Compiled Resource Format |
| .drf | 3D Studio Max Scene Format |
| .drg | AllyCAD CAD Design Drawing Format |
| .dri | Microsoft SQL Server Replication |
| .drl | Gerber Drill Rack Format |
| .drm | Cubase Drum Map Setup Format |
| .drmmeta | Adobe HTTP Dynamic Streaming DRM Additional Header |
| .drmx | Drumlin Fully Secured PDF Document Format |
| .drmz | Drumlin Secured PDF Format |
| .dro | DOSBox Raw OPL Format |
| .dropbox | Dropbox |
| .drpf | DinkeyRemote Parameter |
| .drpm | Delta RPM Format |
| .drr | Altium Designer Drill Report |
| .drs | Corel WordPerfect Driver Resource |
| .drscan | Data Rescue Scans Format |
| .drt | PSpice Or PCB Designer Custom Derating |
| .dru | EAGLE Design Rules |
| .drv | Microsoft Windows Device Driver |
| .drw | Vector Drawing Format |
| .drw2 | Canvas 3.5 Drawing |
| .drw5 | Canvas 5 Drawing |
| .drwdot | SolidWorks Drawing Template Format |
| .drwprp | SolidWorks Drawing Custom Properties Tab Template |
| .drwr | Drop Drawers Drawer |
| .drx | Adobe Photoshop Tutorial |
| .drz | DReport Compressed Report Format |
| .ds | Microsoft SQL Server Data Source Format |
| .ds1 | Diablo 2 Map |
| .ds2 | Olympus Digital Speech Standard Format |
| .ds2res | Dungeon Siege 2 Data |
| .ds4 | Micrografx Designer Graphic |
| .dsa | DAZ Studio 3+ Script |
| .dsb | Rayman 2 Play Format |
| .dsc | Debian Source Control Format |
| .dsd | Autodesk AutoCAD Drawing Set Description Format |
| .dsdb | ANSYS CFX Simulation Database |
| .dse | DAZ Studio Encrypted Script |
| .dsf | DAZ Studio DSF Format Format 3D Format |
| .dsft | Microsoft Application Virtualization Differential SFT |
| .dsg | Control Studio Document Format |
| .dsgm | DS Game Maker Project |
| .dsh | Dashboard PDA Wallpaper |
| .dsi | DAZ Studio Layered Image Set |
| .dsim | Digital Simulator |
| .dsjt= | Adobe Director For Resources |
| .dsk | Disk Image Format |
| .dskin | DockX Skin Format |
| .dsl | Damaged Sector List |
| .dslsetup | Domain Specific Language Setup |
| .dsm | Digital Sound Module Format |
| .dsml | Directory Services Markup Language (DSML) Identity Feed |
| .dsn | Microsoft Database Source Name And Settings Format |
| .dso | Microsoft Visual Studio Workspace Format |
| .dsp | Microsoft Developer Studio Project Format |
| .dsprototype | Microsoft Visual Studio Prototype |
| .dsq | Corel Query Language |
| .dsr | Micrografx Designer Graphic |
| .dss | Olympus DSS Voice Format |
| .dsslideshow | Desktop Sidebar Slideshow Panel |
| .dst | Tajima Embroidery Format |
| .dstl | Acrobat Distiller |
| .dstudio | DownloadStudio Incomplete Download Format |
| .dsu | ProWORX Nxt Data Setup |
| .dsv | DeSmuME Saved Game Format |
| .dsw | Microsoft Visual Studio Workspace Format |
| .dsx | Diet Studio XML Format |
| .dsy | AJC Directory Synchronizer Project Format |
| .dsym | ArchiCAD For MAC Geometric Description Language Format |
| .dsz | Orchida (OES) Embroidery Format |
| .ds_store | Macintosh OS X Folder Information Format |
| .dt | Macintosh Format Data Fork |
| .dt0 | DTED Digital Terrain Elevation Data Level 0 Format |
| .dt1 | DTED Digital Terrain Elevation Data Level 1 Format |
| .dt2 | Microsoft Live Messenger Avatar Format |
| .dt4 | BioSonics Data |
| .dt? | LoseThos Data |
| .dta | Program Data Format |
| .dtapart | DownThemAll Download Part Format |
| .dtb | DataCAD Custom Toolbar |
| .dtb2 | Timbuku Pro DropIn |
| .dtc | Microsoft Windows Application Log |
| .dtd | Document Type Definition Format |
| .dtermlicence | DTerm Licence |
| .dtf | ACDSee Thumbnail Database Format |
| .dtg | Desktop Guitar Score |
| .dth | Microsoft Windows Application Log |
| .dti | Fifa 2001 Data |
| .dtj | Microsoft Windows Application Log |
| .dtl | The Sims |
| .dtm | Audio Module |
| .dtml | Zope Document Template Markup Language |
| .dtn | TunnelCAD Import Or Export |
| .dto | Directory Toolkit Output |
| .dtp | Page Express Desktop Publishing Document |
| .dtproj | SQL Integration Services Project |
| .dtr | DATroniC Data Recording |
| .dts | Digital Surround Audio File Format |
| .dtsconfig | Microsoft SQL Server Integration Services Configuration |
| .dtshd | DTS-HD Master Audio Format |
| .dtsx | DTS Settings Format |
| .dtt | IBM AS/400 Data Transfer |
| .dtv | DVD2AVI Mpeg2 |
| .dtw | My Better Desktop Wallpaper Format |
| .dtx | Documented LaTeX Source Format |
| .dt_ | Apple Macintosh Data Fork Format |
| .dua | FIFA 2001 Data Feart Legalscr |
| .dub | Tuningwrench Audio Utility Compressed |
| .duc | Action Replay Max DS Save Format |
| .ducf | DinkeyChange Update Code |
| .duck | Cyberduck Bookmark Format |
| .dumodule | Apple Mac OS X Disk Utility Plugin Module |
| .dump | Google BreakPad Crash Log Format |
| .dun | Dial-Up Network Config Format |
| .duo | Microsoft Access |
| .dup | Windows DUA Polling Reconfiguration |
| .dup0 | Samsung Kies Duplicate Media |
| .dup1 | Samsung Kies Duplicate Media |
| .dup2 | Samsung Kies Duplicate Media |
| .dus | Readiris Font Dictionary Format |
| .dv | Digital Video Format |
| .dv-avi | Microsoft DV-AVI Video Format |
| .dv2 | Divine Divinity 2 Game Format |
| .dv4 | Bosch Security Systems CCTV Video Format |
| .dvb | DVBLine Document |
| .dvc | Dragon NaturallySpeaking Voice Command Format |
| .dvd | Elby CloneDVD Image |
| .dvddata | TMPGEnc DVD Author Video |
| .dvdfab6 | DVDFab Key |
| .dvdfabhddecrypter | DVDFab HD Decrypter |
| .dvdmedia | RipIt DVD Backup Format |
| .dvdproj | Apple IDVD Project Format |
| .dvdr | DVD Master Image Format |
| .dvdrip-info | Dvd::rip Technical Information |
| .dvds | DVDStyler Project Format |
| .dvf | Sony DV Voice Format |
| .dvg | GraphicsWorks Vector Drawing Format |
| .dvi | TeX Text Document (TeX Device Independent File Format) |
| .dvl | Dalim Virtual Library Format |
| .dvp | AutoCAD Device Parameter |
| .dvr | Microsoft Windows XP Media Center Recorded Television Format |
| .dvr-ms | Microsoft Digital Video Recording Format |
| .dvs | Enterprise Vault DVS |
| .dvsd | DVMaster Pro Video |
| .dvt | DepoView Digital Video Transcript |
| .dvtplugin | Apple Xcode DVT Extension |
| .dvx | DivX Movie |
| .dvz | Documents To Go Data |
| .dw | DavidWhittaker Audio Format |
| .dw1 | DeathWatch WebCrawler |
| .dw2 | DesignCAD Drawing Format |
| .dw3 | DeathWatch WebCrawler |
| .dwa | Digital Waveform Archiver Audio Format |
| .dwb | VariCAD Drawing |
| .dwc | Emulex DWC Firmware Update File Format |
| .dwd | DiamondWare Digitized Format |
| .dwdoc | DrawWell Document Format |
| .dwe | Creator Simulator Pattern |
| .dwf | Autodesk Design Web Format |
| .dwfx | Autodesk Design Web Format |
| .dwg | AutoCAD Drawing Format |
| .dwh | WaterGems Drawing |
| .dwi | Dance With Intensity Format |
| .dwk | DADiSP Worksheet |
| .dwl | AutoCAD Drawing Database Format Locking Information Format |
| .dwl2 | AutoCAD Drawing Lock |
| .dwlibrary | Mariner Paperless Document Library Format |
| .dwm | Digital Works Circuit Project |
| .dwn | CISCO Download Format |
| .dwo | Red Hat Linux DWARF Debugging Information |
| .dwp | DarkWave Studio Project Format |
| .dwproj | DataWindow Designer Project |
| .dws | AutoCAD Standardization Format |
| .dwt | Adobe Dreamweaver Template Format |
| .dwx | DesignWorks Viewer Tools |
| .dwz | Compressed AutoCAD Drawing Format |
| .dx | DEC WPS/DX Text Format |
| .dx2 | Oracle Siebel |
| .dx7 | Yamaha DX-series Raw Audio Data |
| .dxb | AutoCAD Drawing Exchange Format |
| .dxe | AutoCAD Data Extraction Template Format |
| .dxf | AutoCAD DXF Drawing Exchange Format |
| .dxg | Duxbury Braille Translator |
| .dxi | PayWindow Database |
| .dxl | Domino XML Format |
| .dxls | DashXL Skin Set Format |
| .dxml | V++ Graphics Image |
| .dxp | CDBurnerXP Data Compilation Format |
| .dxpack | DesktopX Object |
| .dxr | Adobe Director Protected Movie Format |
| .dxs | Deus Ex Saved Game Format |
| .dxstream | DX Studio Stream |
| .dxstudio | DX Studio Document |
| .dxt | LucasArts The Secret Of Monkey Island: Special Edition Texture |
| .dxt1 | S2TC Compressed Surface |
| .dxt5 | S2TC Compressed Surface File (texture) |
| .dxtheme | DesktopX Windows Desktop Theme |
| .dxtorylic | Dxtory Licence |
| .dxv | DocXchanger |
| .dxx | AutoCAD Drawing Interchange Attribute Format |
| .dxz | Trojan Backdoor Virus |
| .dyc | Xerox Printer Driver Configuration Format |
| .dylib | Xcode Dynamic Library Format |
| .dyn | Lotus 1-2-3 |
| .dyv | WORM_AUTORUN.DYV Worm |
| .dyz | Backdoor.Win32.ProRat.dyz Trojan |
| .dz | Dzip Format |
| .dzi | PhotoSynth Deep Zoom Image |
| .dzip | The Witcher 2 Game Archive |
| .dzl | DazzlerMAX |
| .dzm | Cyberlink DirectorZone Menu Template Format |
| .dzp | DirectorZone Particle Effect Format |
| .dzs | Download Accelerator Skin |
| .dzt | Cyberlink DirectorZone Title Template Format |
File extensions are not normally displayed to users. To change this, go to Control Panel, select Appearance and Personalization and Folder Options. Next, select the View and find the option "Hide extensions for known file types". The option should be deselected (cleared) and confirmed with OK.
