| File extension | Developer/Producer | File description |
|---|---|---|
| D file extension | N/A | D Programming Language Source Code Format |
| D00 file extension | N/A | OPL2 FM Audio Format |
| D01 file extension | N/A | OPL2 FM Audio Format |
| D02 file extension | Cadence Design Systems, Inc. | MicroSim PCBoard NC Drill Data |
| D03 file extension | Cadence Design Systems, Inc. | MicroSim PCBoard NC Drill Data |
| D05 file extension | Cadence Design Systems, Inc. | MicroSim PCBoard NC Drill Data |
| D07 file extension | Cadence Design Systems, Inc. | MicroSim PCBoard NC Drill Data |
| D08 file extension | Cadence Design Systems, Inc. | MicroSim PCBoard NC Drill Data |
| D1 file extension | N/A | Progress Database |
| D10 file extension | Bob Baggerman | IRIG 106 Recording Directory |
| D11 file extension | NorthStar Solutions, LLC. | Macro Mania Data |
| D2 file extension | N/A | Progress Database |
| D2A file extension | N/A | Avisynth MPAsource Plugin Scan |
| D2CT file extension | John Norstadt | Disinfectant For Mac |
| D2H file extension | N/A | Diablo II Hack It Module |
| D2I file extension | Hakai no Tenshi | ATMA Diablo II |
| D2P file extension | Blizzard Entertainment, Inc. | Diablo 2 Packet |
| D2S file extension | Blizzard Entertainment | Diablo II Saved Map Seed Data Format |
| D2V file extension | N/A | DVD2AVI Format |
| D2X file extension | Blizzard Entertainment, Inc. | Diablo 2 Stash |
| D32 file extension | N/A | Lotus Visualisation |
| D3C file extension | Interplay Entertainment Corporation | Descent |
| D3D file extension | YoYo Games | Game Maker 3D Model Format |
| D3DBSP file extension | Activision | Call Of Duty Modern Warfare 2 Map Format |
| D3M file extension | Interplay Entertainment Corporation | Descent Game |
| D3S file extension | N/A | Nikon Image Format |
| D3V file extension | Datel | Datel Video Format |
| D3X file extension | N/A | Nikon Image Format |
| D4 file extension | N/A | Dataphor Source |
| D43 file extension | IAR Systems | IAR Debug |
| D5P file extension | Alexandre Devilliers | Dragon UnPACKer Language Pack |
| D64 file extension | N/A | Commodore Emulator Format |
| D67 file extension | VICE | VICE Disk Image |
| D71 file extension | N/A | Commodore Emulator |
| D80 file extension | N/A | Commodore CBM-8050 Diskette Emulator Image |
| D81 file extension | N/A | Commodore VC-1581 Diskette Emulator Image |
| D82 file extension | N/A | Commodore Emulator |
| D88 file extension | N/A | Toshiba Pasopia 7 Disk Format |
| DA file extension | Procedimientos-Uno, S.L. | DAwin Project |
| DA$ file extension | N/A | Microsoft Compressed DAT |
| DA0 file extension | Microsoft | Microsoft Windows 9x Registry Backup Format |
| DA1 file extension | Microsoft Corporation | Windows Registry Backup |
| DA2 file extension | HammerTap | DeepAnalysis 2 EBay Auction Data |
| DA3 file extension | Microprose | Star Trek Generations Saved Game |
| DA4 file extension | Naviter d.o.o. | SeeYou Waypoint |
| DA5 file extension | Microprose | Star Trek Generations Saved Game |
| DA6 file extension | Microprose | Star Trek Generations Saved Game |
| DA7 file extension | Microprose | Star Trek Generations Saved Game |
| DA8 file extension | Microprose | Star Trek: Generations Saved Game |
| DA9 file extension | Microprose | Star Trek Generations Autosave Game |
| DAA file extension | PowerISO Computing | PowerISO Direct-Access-Archive Format |
| DAAP file extension | N/A | Apple DAAP Playlist |
| DAB file extension | Firetongue Software | OrangeCD Catalog Database |
| DABRIEFCASE file extension | RemObjects | RemObjects Data Abstract File Briefcase |
| DAC file extension | Dynacom Technologies Inc. | Dynacom Accounting Data |
| DACONFIG file extension | RemObjects | RemObjects Data Abstract Configuration Format |
| DACONNECTIONS file extension | RemObjects | RemObjects Data Abstract Connections Format |
| DACPAC file extension | Microsoft | Database Deployment Format |
| DAD file extension | RemObjects | RemObjects Data Abstract Driver Format |
| DAD2 file extension | N/A | Canvas For Mac |
| DADIAGRAMS file extension | RemObjects | RemObjects Data Abstract Data Diagrams Format |
| DADX file extension | The Eclipse Foundation | Eclipse Document Access Definition Extension |
| DAE file extension | Sony | Collada 3D Digital Asset Format |
| DAEMONSCRIPT file extension | DT Soft Ltd | Daemon Tools Script |
| DAF file extension | Telecompute Integrated Systems | Digital Anchor Data Format |
| DAG file extension | Blue Leaf Software | Dagra Document |
| DAH file extension | Indigo Rose Corporation | AutoPlay Media Studio Splash Image |
| DAI file extension | Dream Aquarium | Dream Aquarium Patch |
| DAL file extension | SpeedBit | Download Accelerator Plus DAP List Format |
| DAM file extension | Bissantz | DeltaMaster Analysis Model Format |
| DAN file extension | DanMedical Ltd. | D-MAS Analysis System Patient |
| DAO file extension | N/A | Disk At Once CD/DVD Image Format |
| DAP file extension | Microsoft | Microsoft Access Data Access Page Format |
| DAPF file extension | Microcosm Ltd. | DinkeyAdd Parameter |
| DAPROJ file extension | DivX, LLC | DivX Author Project |
| DAQ file extension | MathWorks, Inc. | Data Acquisition Toolbox |
| DAR file extension | N/A | DAR Disk Archive |
| DART file extension | N/A | Apple Mac OS X DiskImageMounter DART Image |
| DARTCLIP file extension | Dartfish | Dartfish Metadata |
| DAS file extension | Bissantz | DeltaMaster Analysis Session Format |
| DASCHEMA file extension | RemObjects | Data Abstract Database Schema Format |
| DASH file extension | Dashlane, Inc. | Dashlane Profile |
| DAT file extension | N/A | Program Data Format |
| DAT-SHM file extension | eM Client Inc. | EmClient Data |
| DAT2 file extension | Donald Lessau | XYplorer Thumbnail Cache |
| DATA file extension | Appricon | Analysis Studio Offline Data Format |
| DATACONTRACT file extension | N/A | Web Service Software Factory Installer |
| DATASOURCE file extension | Microsoft Corporation | Microsoft Visual Studio Data Source |
| DATBAK0 file extension | Miranda IM Project | Miranda Data File Backup |
| DAT_MCR file extension | Mojang | Minecraft Backup Format |
| DAT_NEW file extension | Mojang | Minecraft Level Format |
| DAT_OLD file extension | Mojang | Minecraft Backup Format |
| DAT_TUREG_OLD file extension | Microsoft Corporation | Windows Registry |
| DAU file extension | NCH Software Pty Ltd | Express Dictate Dictate Record |
| DAV file extension | DVR365 | Mace DVR-1600HP Video Format |
| DAWG file extension | Eliot Development Team | Eliot Dictionary |
| DAX file extension | Sony | Compressed CD Image Format |
| DAY file extension | BrainBox Games | Day Of The Zombie Map Format |
| DAYZPROFILE file extension | Bohemia Interactive | DAYZ Profile |
| DAZ file extension | DAZ Productions | DAZ Studio Format |
| DAZIP file extension | BioWare | Dragon Age Origins Game Format |
| DA_ file extension | GkWare e.K. | GKSetup Support |
| DB file extension | N/A | Database Format |
| DB$ file extension | dataBased Intelligence, Inc. | DBASE Temporary |
| DB- file extension | Symantec | Norton Nprotect Database Format |
| DB-JOURNAL file extension | SQLite Development Team | SQLite Database Journal |
| DB-SHM file extension | SQLite | Google Android SQLite Temporary Database Format |
| DB-WAL file extension | SQLite | Google Android SQLite Temporary Database Format |
| DB0 file extension | dataBased Intelligence, Inc. | DBASE Init |
| DB1 file extension | Tekla | Tekla Structures Format |
| DB2 file extension | dBASE | DBASE II Database Format |
| DB2IND file extension | Microsoft Corporation | Microsoft Visual Studio DB2 Index |
| DB2MOV file extension | Astonsoft Ltd. | DeepDVD Movie Authoring Project |
| DB2P file extension | N/A | IBM Database Project |
| DB2SP file extension | Microsoft Corporation | Microsoft Visual Studio DB2 Create Procedure Statement |
| DB2TBL file extension | Microsoft Corporation | Microsoft Visual Studio DB2 Table Script |
| DB2TR file extension | Microsoft Corporation | Microsoft Visual Studio DB2 Trigger Script |
| DB2UDF file extension | Microsoft Corporation | Microsoft Visual Studio DB2 User Defined Function |
| DB2VW file extension | Microsoft Corporation | Microsoft Visual Studio DB2 View Script |
| DB3 file extension | SQLite | Database Format |
| DB3-JOURNAL file extension | SQLite Development Team | SQLite Temporary Database Journal |
| DB4 file extension | dataBased Intelligence, Inc. | DBase IV Data |
| DB5 file extension | GSC Game World | S.T.A.L.K.E.R. Game |
| DB6 file extension | GSC Game World | S.T.A.L.K.E.R. Game |
| DB7 file extension | GSC Game World | S.T.A.L.K.E.R. Game |
| DB8 file extension | GSC Game World | S.T.A.L.K.E.R. Game |
| DB9 file extension | GSC Game World | S.T.A.L.K.E.R. Game |
| DBA file extension | Palm | Palm Desktop For Windows Format |
| DBAG file extension | SYNAMETIRCS | WinSQL DataBag |
| DBAT file extension | Intuit Inc. | Quicken For Mac Data |
| DBB file extension | Skype | Skype User Data Format |
| DBC file extension | N/A | Microsoft Visual FoxPro Database Format |
| DBD file extension | Macrovision | DemoShield Project Format |
| DBF file extension | dBASE | Common Database Format |
| DBG file extension | N/A | Debug Format |
| DBGSYM file extension | N/A | Debug Symbols Format |
| DBH file extension | Freescale Semiconductor, Inc. | CodeWarrior Debug Preferences |
| DBHEADER file extension | BoostYourPC.com | Download Boost Header |
| DBI file extension | Electronic Arts, Inc. | FIFA World Cup Game Data Comin Fe |
| DBK file extension | Sony Ericsson | Sony Ericsson Mobile Phone Backup Format |
| DBL file extension | DAZ Productions | DAZ Brick Light Format |
| DBLIB file extension | Altium Limited. | Altium Designer Database Library |
| DBLINK file extension | Altium Limited. | Altium Designer Database Link |
| DBM file extension | Adobe Systems | Adobe ColdFusion Template Format |
| DBMANIFEST file extension | Microsoft Corporation | Database Manifest |
| DBMC file extension | AOL Inc. | Netscape Cache Log |
| DBMDL file extension | Microsoft Corporation | Microsoft Visual Studio Database Project |
| DBMG file extension | AOL Inc. | Netscale Navigator History |
| DBML file extension | Microsoft | Microsoft Visual Studio Object Relational OR Designer Format |
| DBNW file extension | AOL Inc. | Netscape News |
| DBNX file extension | AOL Inc. | Netscape For Mac Host |
| DBO file extension | The Game Creators | DarkBASIC Source Code Format |
| DBP file extension | Microsoft Corporation | Microsoft Visual Studio Visual C++ Database Project |
| DBPF file extension | N/A | Maxis Database Packed Format |
| DBPRO file extension | The Game Creators | DarkBASIC Project Format |
| DBPROJ file extension | Microsoft | Microsoft Visual Studio Visual C++ Database Project Format |
| DBQ file extension | Autodesk | AutoCAD Query Set |
| DBR file extension | Astonsoft | DeepBurner Burn List Format |
| DBS file extension | Unify | SQL Structured Query Language Database Command Format |
| DBSCHEMA file extension | Microsoft Corporation | Database Schema |
| DBT file extension | N/A | Database Text Memo Format |
| DBV file extension | N/A | Database Variable Field |
| DBW file extension | Microsoft Corporation | Microsoft Windows Database |
| DBX file extension | Microsoft | Microsoft Outlook Express E-mail Folder Format |
| DBZ file extension | Datanamic Solutions BV | DB Zipper Compressed Database |
| DC file extension | IMSI/Design | DesignCAD CAD Format |
| DC0 file extension | The OpenBSD Project | OpenBSD |
| DC1 file extension | N/A | Bloomba E-mail Message Format |
| DC2 file extension | IMSI/Design | DesignCAD CAD Format |
| DC3 file extension | IMSI/Design | DesignCAD 3D ASCII Drawing |
| DC4 file extension | ViaThinkSoft | ViaThinkSoft (De)Coder Format |
| DC42 file extension | Apple, Inc. | Apple Disk Copy 4.2 Disk Image |
| DC5 file extension | DATACAD LLC. | DataCAD Drawing Format |
| DC6 file extension | Blizzard Entertainment, Inc. | Diablo 2 Static Image |
| DCA file extension | IBM | DisplayWrite Document |
| DCB file extension | LexisNexis | Concordance Database Control Block Format |
| DCC file extension | Blizzard Entertainment, Inc. | Diablo 2 Animation |
| DCD file extension | IMSI/Design | DesignCAD Drawing Format |
| DCDC file extension | Gold Disk Inc. | Astound Presentation |
| DCE file extension | N/A | Drivecam Video File Format |
| DCF file extension | Sony Ericsson | DRM Content Format Delivery Format |
| DCG file extension | N/A | HSFX Map |
| DCK file extension | Resolume | Resolume Deck Format |
| DCL file extension | Autodesk | AutoCAD Dialog Definition Format |
| DCLS file extension | Dassault Systèmes S.A. | CATIA V4 Settings |
| DCM file extension | NEMA | Dicom Medicine Image File Format |
| DCMD file extension | Fujiwara Software | DiskCatalogMaker Catalog Database Format |
| DCMF file extension | Fujiwara Software | DiskCatalogMaker Catalog |
| DCN file extension | Autodesk, Inc. | Autodesk Depth Slope Definition |
| DCO file extension | COSECT | DisCryptor Encrypted Archive |
| DCOVER file extension | BeLight Software | BeLight Disc Cover Format |
| DCP file extension | Adobe Systems | Adobe Photoshop DNG Digital Negative Camera Profile Format |
| DCPF file extension | Sonic Solutions | Roxio Disc Copier Project Format |
| DCPIL file extension | Embarcadero Technologies, Inc. | Delphi Compiler Symbolic Information |
| DCPR file extension | Adobe Systems | Adobe Photoshop DNG Digital Negative Camera Profile Recipe Format |
| DCPROJ file extension | Apple | Dashcode Project |
| DCPY file extension | Apple, Inc. | Disk Copy |
| DCR file extension | Kodak | Kodak Digital Camera Raw Image Format |
| DCS file extension | Quark | QuarkXPress Desktop Color Separation Format |
| DCST file extension | Adobe Systems | Adobe InDesign Format |
| DCT file extension | N/A | Microsoft Visual FoxPro Database Container Memo Format |
| DCT5 file extension | Microsoft Corporation | Microsoft Word 5 For Mac Dictionary |
| DCTMP file extension | DC++ | DC++ Partially Downloaded Format |
| DCTX file extension | Microsoft Corporation | Microsoft Office IME Open Extended Dictionary |
| DCTXC file extension | Microsoft Corporation | Microsoft Office IME Open Extended Dictionary |
| DCU file extension | N/A | Delphi Compiled Unit Format |
| DCUIL file extension | Embarcadero Technologies | Delphi Compiled Unit Format |
| DCV file extension | SecurStar | DriveCrypt Encrypted Volume |
| DCX file extension | N/A | Microsoft Visual FoxPro Database Container (DBC) |
| DD file extension | Symantec | DiskDoubler Compressed Archive Format |
| DD2 file extension | ProFantasy Software Ltd | Dungeon Designer 2 Map Design |
| DD3 file extension | Games Workshop Group PLC | Blood Bowl Game |
| DDA file extension | N/A | TNTmips Import |
| DDAP file extension | Symantec Corporation | DiskDoubler Compressed |
| DDAT file extension | DivX | DivX Web Player Temporary Download Format |
| DDC file extension | Daren Softwares | DivX Descriptor DVD Description Format |
| DDCX file extension | Daren Softwares | DivX Descriptor 2 Format |
| DDD file extension | Dream Design Entertainment | GLBasic 3D Data Format |
| DDE file extension | Microsoft Corporation | Dynamic Data Exchange |
| DDF file extension | Microsoft | Diamond Directive Format |
| DDJ file extension | Joymax Co., Ltd. | Silkroad Alchemy Page |
| DDK file extension | IBM | IBM OS/2 Saved SKF |
| DDL file extension | N/A | SQL Data Definition Language Format |
| DDM file extension | Alpha Software, Inc. | Alpha Five Table Objects |
| DDOC file extension | SK.ee | DigiDoc Client Container |
| DDP file extension | Embarcadero Technologies | Delphi Diagram Page From Compiler |
| DDPOKERSAVE file extension | Donohoe Digital LLC | DD Poker Save Game |
| DDR file extension | Microcosm Ltd. | DDRemote Parameter |
| DDRW file extension | Apple | Apple ClarisDraw Draw Format |
| DDS file extension | Microsoft | DirectDraw Surface Format |
| DDSX file extension | Firefly Studios Ltd. | Stronghold Kingdoms Data |
| DDT file extension | Sports Interactive | Football Manager Player Club And Nations Format |
| DDX file extension | Alpha Software, Inc. | Alpha Five Data Dictionary Index |
| DDZ file extension | N/A | Adaptec Unix Driver |
| DE file extension | N/A | German Language Translation |
| DEB file extension | N/A | Debian Linux Package Format |
| DEBIAN file extension | Debian Project Team | Debian Related |
| DEC file extension | N/A | VersaPro Declaration Format |
| DECK file extension | Microsoft Corporation | Microsoft Office For Mac Query |
| DECRYPT file extension | Microsoft | Microsoft Windows 8 Decrypted ESD Format |
| DED file extension | Roland | Dr. Engrave Document Format |
| DEE file extension | N/A | Creator Simulator Description |
| DEF file extension | N/A | Definition Format |
| DEFINITION file extension | Apple, Inc. | Apple Mac OS X Automator Data Type Definition |
| DEFORM file extension | Neuber Software | FontTwister Deform Guide Line |
| DEK file extension | Side-Eight | Memorize-It Flashcards Deck Format |
| DEL file extension | N/A | PCTracker Undelete Tracking |
| DELF file extension | N/A | Malicious Or Virus |
| DEM file extension | N/A | Recorded Game Format |
| DEMO file extension | Totem Entertainment | VirtuaGirl HD Model Demo |
| DEMO4 file extension | N/A | UT2004 Demo |
| DENY file extension | N/A | Linux Access |
| DEP file extension | Microsoft | Microsoft Visual Basic Setup Wizard Dependency Format |
| DEPEND file extension | Code Blocks | Code::Blocks Project Support Format |
| DEPLOYMENTOPTIONS file extension | Microsoft Corporation | SQL Server Deployment Options |
| DEPLOYMENTTARGETS file extension | Microsoft Corporation | SQL Server Deployment Target |
| DEPROJ file extension | NCH Software | Disketch Project Format |
| DER file extension | N/A | DER Encoded Internet Security Certificate Format |
| DES file extension | PTC | Pro/DESKTOP Design Format |
| DES-SE file extension | Google Inc. | Sony Ericsson XPERIA X10 |
| DESC file extension | Electronic Arts | Description Format |
| DESCRIPTION file extension | N/A | Multilizer PDF Translator Description |
| DESIGN file extension | Microsoft | Microsoft Expression Design Drawing Format |
| DESKLINK file extension | N/A | Desktop Shortcut |
| DESKTHEMEPACK file extension | Microsoft | Microsoft Windows 8 Theme Pack Format |
| DESKTOP file extension | N/A | DesktopX Windows Desktop Theme Format |
| DESS file extension | Microsoft Corporation | Microsoft Device Emulator Saved State |
| DET file extension | Sage | ACT! Format |
| DEU file extension | Adobe Systems Incorporated | Adobe Reader German Language |
| DEV file extension | N/A | Windows Device Driver Format |
| DEVELOPERPROFILE file extension | Apple | Apple Xcode Developer Profile Format |
| DEVELVE file extension | Develve | Develve Format |
| DEVICEIDS file extension | Apple | Apple IOS Device Identification Format |
| DEVICEINFO file extension | Apple | Apple IPhone Configuration Utility Format |
| DEVICEMANIFEST-MS file extension | Microsoft Corporation | Microsoft Windows Device Metadata |
| DEVICEMETADATA-MS file extension | Microsoft Corporation | Microsoft Windows 7 Device Metadata Package |
| DEVICESALT file extension | Barnes & Noble | Nook Encrypted Format |
| DEVPAK file extension | Bloodshed | Dev-C++ Developer Package |
| DEVX file extension | Rick Meyers | E-sword Devotional |
| DEWF file extension | N/A | SoundCap, SoundEdit Recorded Instrument |
| DEX file extension | DEXIS | DEXIS Dental Radiograph Format |
| DEXE file extension | Microsoft Corporation | Microsoft Virtual PC For Mac Executable |
| DEZ file extension | Datanamic Solutions BV | DeZign For Databases Project |
| DF file extension | Corel Corporation | Corel Paradox Table Filter |
| DF1 file extension | Raining Data | Omnis7 And Omnis Studio Database File Format |
| DF10 file extension | Bob Baggerman | IRIG 106 Recording Directory |
| DF2 file extension | N/A | Defractor 2 Instrument Audio Format |
| DF3 file extension | TigerLogic Corp. (Omnis Technology Corporation) | Omnis7 And Omnis Studio Database |
| DF4 file extension | TigerLogic Corp. (Omnis Technology Corporation) | Omnis7 And Omnis Studio Database |
| DF6 file extension | TigerLogic Corp. (Omnis Technology Corporation) | Omnis7 And Omnis Studio Database |
| DF7 file extension | TigerLogic Corp. (Omnis Technology Corporation) | Omnis Studio Database |
| DFB file extension | Interscape, Software Solutions | Data Flask Formula |
| DFC file extension | N/A | Defractor Instrument Format |
| DFE file extension | RISCOS Ltd. | RISC OS Comma Separated Value |
| DFF file extension | N/A | RenderWare Model Format |
| DFG file extension | Interscape | Data Flask Grid Format |
| DFH file extension | Cakewalk, Inc. | SONAR Kit |
| DFK file extension | Invisionsoft | Dark Flow Project Format |
| DFL file extension | N/A | OLE2 Doc |
| DFM file extension | Borland | Delphi Win32 Form Format |
| DFN file extension | N/A | Delphi Definition |
| DFONT file extension | N/A | Mac OS X Data Fork Suitcase Format |
| DFP file extension | eyeon | Eyeon Fusion Plugin Format |
| DFPROJ file extension | DVD Flick | DVD Flick Project Format |
| DFQ file extension | SmartWare Corporation | SmartWare Query Definition |
| DFR file extension | SmartWare Corporation | SmartWare Report Definition |
| DFS file extension | BrainSuite | BrainSuite 3D Surface Format |
| DFT file extension | N/A | Solid Edge Drawing Format |
| DFU file extension | Apple | Apple IOS Firmware Update Format |
| DFV file extension | Microsoft Corporation | MS Office Word Print Format Template |
| DFW file extension | SmartWare Corporation | SmartWare Cross-tab Definition |
| DFX file extension | Autodesk | Drafix CAD Format |
| DFXP file extension | N/A | Timed Text Markup Language |
| DG file extension | The Database Managers, Inc. | Source Code For A Dialog Box |
| DG-KEY file extension | GipsyMedia Ltd | DigiGuide Key |
| DG3 file extension | RockWare, Inc. | DeltaGraph |
| DGB file extension | Digitarch | FlashCAD Drawing Database Format |
| DGC file extension | N/A | TurboTax Tax Form Format |
| DGDAT file extension | 2GIS | DoubleGIS Database |
| DGF file extension | Trimble Navigation Limited | GPS Pathfinder Office Geoid Grid |
| DGI file extension | N/A | HDConvertToX Input |
| DGK file extension | Delcam | Delcam PowerMILL Format |
| DGL file extension | GipsyMedia Ltd | DigiGuide Language |
| DGM file extension | IBM | Lotus Freelance Diagram |
| DGMAKER file extension | GipsyMedia Ltd | DigiGuide Marker |
| DGML file extension | Microsoft | Microsoft Visual Studio Directed Graph Markup Language Format |
| DGN file extension | Bentley Systems | MicroStation Design Format |
| DGNLIB file extension | Bentley Systems, Incorporated | MicroStation Design Library |
| DGPD file extension | RockWare, Inc. | DeltaGraph Document |
| DGPRINT file extension | GipsyMedia Ltd | DigiGuide Print Template |
| DGR file extension | RockWare, Inc. | DeltaGraph Document |
| DGRH file extension | RockWare, Inc. | DeltaGraph For Mac |
| DGS file extension | TES | TES Dagesh Pro Document Format |
| DGSL file extension | Microsoft | Microsoft Visual Studio Visual Shader Graph Format |
| DGT file extension | N/A | Digital Gallery Format |
| DGX file extension | IBM | IBM Rational XDE |
| DGZ file extension | N/A | Dega Saved State |
| DHCD file extension | DHCD Computing | DHCD Computing Format |
| DHE file extension | Microsoft Corporation | Microsoft Help Workshop Dialog Box Help Editor Document |
| DHF file extension | N/A | AMIGA Emulator Disk Image ROM |
| DHS file extension | Hyperionics | HyperSnap Drawing |
| DHT file extension | Aptech | GAUSS Data Set Header Format |
| DHTML file extension | N/A | Dynamic HTML Format |
| DHW file extension | ACE CAD Enterprise Co., Ltd. | ACECAD Digimemo Memo |
| DHY file extension | Adobe Systems Incorporated | Adobe Bridge |
| DI file extension | N/A | D Programming Language Source Code |
| DIA file extension | Dia | DIA Drawing Format |
| DIAGCAB file extension | Microsoft | Microsoft Windows Troubleshooting CAB Format |
| DIAGCFG file extension | Microsoft | Microsoft Windows Troubleshooting Configuration Format |
| DIAGPKG file extension | Microsoft | Microsoft Windows Troubleshooting Package Format |
| DIB file extension | N/A | Device-Independent Bitmap Graphic |
| DIC file extension | N/A | Dictionary Format |
| DICM file extension | N/A | Medicine Image |
| DICOM file extension | NEMA | DICOM Image Format |
| DICPROOF file extension | Microsoft | Microsoft Office Dictionary Proofing Format |
| DICT file extension | Sunnysoft s.r.o. | Sunnysoft InterWrite |
| DID file extension | Adobe Systems Incorporated | Adobe Distiller/Bridge |
| DIE file extension | Blizzard Entertainment, Inc. | Diablo Item |
| DIF file extension | Microsoft | Digital Interface Format |
| DIFF file extension | N/A | Diff Source |
| DIG file extension | N/A | Audio Format |
| DII file extension | CT Summation | CT Summation Document Image Information Load Format |
| DIL file extension | Embarcadero Technologies, Inc. | Delphi |
| DIM file extension | N/A | Direct Internet Message Encapsulation DIME Format |
| DIMAX file extension | Massoth Electronics | DiMAX Firmware Format |
| DIME file extension | N/A | Direct Internet Message Encapsulation Format |
| DIMG file extension | N/A | Mac Disk Image |
| DIN file extension | Sapphire Group | DataEase Installation Script |
| DINERDASH2SAVEDGAME file extension | Playfirst | Diner Dash 2 Saved Game |
| DINERDASHSAVEDGAME file extension | Playfirst | Diner Dash Saved Game |
| DINFO file extension | DivX | DivX Web Player Temporary Download Format |
| DIP file extension | N/A | Windows Bitmap Format |
| DIR file extension | Adobe Systems | Adobe (Macromedia) Director Format |
| DIR00 file extension | N/A | Disk Defrag Error Or Dump |
| DIRECTORY file extension | KDE | KDE Folder View Properties Format |
| DIS file extension | Oracle | Oracle Discoverer Workbook Format |
| DISABLED file extension | Safer Networking | Spybot - Search & Destroy Disabled Format |
| DISC file extension | Roxio | Toast Document |
| DISCO file extension | Microsoft | DISCO Discovery Document |
| DISCOMAP file extension | Microsoft | Microsoft DISCO Discovery Output Format |
| DISK file extension | N/A | Linux Virtual Hard Disk Format |
| DISKCOPY42 file extension | Apple, Inc. | Apple Disk Copy 4.2 Disk Image |
| DISKDEFINES file extension | N/A | Linux LiveCD Information Format |
| DIST file extension | Apple | Apple Mac OS X Installer Distribution Format |
| DIST-RDB file extension | Richard Hughey - Kevin Karplus - Anders Krogh | SAM Scoring |
| DISTZ file extension | Apple, Inc. | Apple Mac OS X Installer Distribution |
| DIT file extension | Microsoft | Microsoft Windows 2000 Active Directory Schema Format |
| DITA file extension | OASIS | DITA Output Format |
| DITAMAP file extension | OASIS | DITAmap Format |
| DITAVAL file extension | International Standards Organization | DITA Conditions Format |
| DIV file extension | N/A | DivX Movie |
| DIVA file extension | SEGA | Project DIVA Song Format |
| DIVX file extension | DivX | DivX Media Format |
| DIX file extension | N/A | DIVA-GIS Export Format |
| DIY file extension | Huntersoft | My Drivers Backup Format |
| DIZ file extension | N/A | Description In ZIP Format |
| DJ file extension | Delorie Software | DJGPP Docs |
| DJA file extension | Dundjinni Enterprises, Inc. | DunDjinni |
| DJANIMATIONS file extension | N/A | Digital Juice Animation |
| DJF file extension | NTI Corporation | NTI Drive Backup |
| DJG file extension | Delorie Software | DJGPP Compiler Makefile |
| DJM file extension | Dynoject Research | Dynojet Map Format |
| DJPROJECTS file extension | Digital Juice, Inc. | Digital Juice Compressed |
| DJR file extension | Avanquest Software | Ringtone Media Studio Ringtone Format |
| DJS file extension | Electronic Arts, Inc. | NASCAR Thunder 2004 Game Music |
| DJV file extension | LizardTech | DjVu Image Format |
| DJVU file extension | LizardTech | DjVu Image Format |
| DJX file extension | Dundjinni Enterprises, Inc. | Dundjinni Art |
| DK@P file extension | N/A | DocMaker Standalone Document |
| DKB file extension | Persistence of Vision Raytracer Pty. Ltd. | DKBTrace Raytraced Graphics |
| DKD file extension | Ellipse Studios | Submarine Titans Battle Map |
| DKE file extension | CenterTools | DriveLock FDE Disk Key Format |
| DKLANG file extension | DK Software | DKLang Translation Editor Translation |
| DKT file extension | d-lusion interactive media | DiGiTIAL THUNDER Drum Kit Format |
| DKZ file extension | N/A | ZIP Description Text |
| DL file extension | Microsoft | Zoo Tycoon 2 Game Format |
| DL0 file extension | ABBYY | Abbyy Finereader 4.0 Sprint |
| DLB file extension | N/A | Troj/Dloadr-AHT |
| DLC file extension | N/A | JDownloader Download Link Container |
| DLCT file extension | Apple, Inc. | AppleScript Dialect |
| DLD file extension | Campbell Scientific | EdLog Compiled Program |
| DLE file extension | Autodesk, Inc. | 3D Studio Max Plugin |
| DLF file extension | DATACAD LLC. | DataCAD Double Precision Layer |
| DLG file extension | N/A | Digital Line Graph Vector Image Format |
| DLI file extension | N/A | Win32.Sober.AD@mm |
| DLK file extension | Milestone Systems | Xprotect License Code List |
| DLL file extension | Microsoft | Dynamic Link Library Format |
| DLL1 file extension | Splashtop Inc. | ASUS ExpressGate (Splashtop) |
| DLLS file extension | N/A | UFO: Alien Invasion Plugin |
| DLLX file extension | N/A | Backdoor.Bot |
| DLL_NON_OPT file extension | Adobe Systems Incorporated | Adobe |
| DLL_RESP file extension | Microsoft Corporation | Microsoft Windows Live Messenger Contact Related |
| DLM file extension | Akamai | Akamai Download Manager Format |
| DLO file extension | N/A | 3D Studio Max Plugin Format |
| DLP file extension | Microsoft Corporation | DirectMusic Producer DLS |
| DLPF file extension | Microcosm Ltd. | DinkeyLook Diagnostic Information |
| DLS file extension | N/A | DownLoadable Sound Format |
| DLU file extension | Autodesk | 3D Studio Max Utility Plug-in Format |
| DLV file extension | Dassault Systemes | CATIA Export Format |
| DLV4 file extension | Dassault Systèmes S.A. | Catia |
| DLX file extension | Sony | Sony VDU File Format Importer |
| DLZ file extension | CPT | Crossword Power Tools Crossword Library |
| DL_ file extension | Microsoft | Microsoft Windows DLL Backup Format |
| DM file extension | Sony Ericsson | DRM Delivery Message |
| DM1 file extension | Embarcadero Technologies | ER/Studio Database Model Format |
| DM2 file extension | Charonware | Toad Data Modeler Format |
| DM3 file extension | Gatan | Gatan Digital Micrograph Format |
| DMB file extension | N/A | Digital Multimedia Broadcasting Format |
| DMC file extension | nModal Solutions | Datamartist Data Canvas Format |
| DMD file extension | Oracle | Oracle SQL Developer Data Modeler Data Format |
| DMF file extension | XTracker | Delusion/Xtracker Audio Format |
| DMFR file extension | WestByte Software | Download Master Incomplete Download |
| DMG file extension | Apple | Apple Mac OS X Disk Image Format |
| DMGPART file extension | Apple | Apple Mac OS X UDIF Split Disk Image Format |
| DMI file extension | BYOND | DreamMaker Format |
| DMKIT file extension | Image-Line | Drumaxx |
| DML file extension | Dynascript Technologies | DynaScript Markup Language Format |
| DMM file extension | Seavus | DropMind Mind Map Format |
| DMMS file extension | Seavus DOOEL | DropMind Map Style |
| DMMX file extension | Seavus | DropMind XML Map Bundle Format |
| DMN file extension | SAS Institute Inc. | SAS Metadata |
| DMO file extension | Apogee Software | Demo Format |
| DMP file extension | Microsoft | Memory Dump, Screen Dump, Junk Files |
| DMPATCH file extension | Image Line Software BVBA | Fruity Loops Studio |
| DMPR file extension | e3 Software | Direct Mail Project Format |
| DMPTRN file extension | Image Line Software BVBA | Fruity Loops Studio Pattern |
| DMR file extension | BrainVoyager | BrainVoyager QX Project Format |
| DMS file extension | N/A | Disk Masher Image |
| DMSA file extension | Sonic Solutions | Roxio Music Disc Creator Project Format |
| DMSD file extension | Sonic Solutions | Roxio Creator MyDVD DVD Project Format |
| DMSD3D file extension | Sonic Solutions | Roxio MyDVD 3D Project |
| DMSE file extension | Sonic Solutions | Roxio Sound Editor Project Format |
| DMSK file extension | DivX | DivX Web Player Temporary Download Format |
| DMSM file extension | Sonic Solutions | Roxio Creator VideoWave Movie Project Format |
| DMSM3D file extension | Sonic Solutions | VideoWave 3D Movie Project Format |
| DMSP file extension | Sonic Solutions | Roxio PhotoSuite Project Format |
| DMSS file extension | Sonic Solutions | Roxio Creator VideoWave Slideshow Project Format |
| DMT file extension | DeLorme | DeLorme Transfer Format |
| DMTEMPLATE file extension | e3 Software | Direct Mail E-mail Template Format |
| DMU file extension | N/A | DigitalMugician Audio |
| DMV file extension | Adobe Systems Incorporated | Adobe Acrobat Catalog |
| DMX file extension | Valve | Source Filmmaker Project Format |
| DMX-INFO file extension | Innovative Solutions | DriverMax Driver Information Format |
| DMY file extension | PhysioNet | SEMIA LTST DB Time Series Data |
| DM_1 file extension | Activision | Call Of Duty Demo |
| DM_57 file extension | id Software LLC | Return To Castle Wolfenstein Demo |
| DM_68 file extension | id Software | Quake 3 Demo Format |
| DM_82 file extension | Splash Damage | Wolfenstein Enemy Territory Demo Format |
| DM_83 file extension | Splash Damage | Wolfenstein Enemy Territory Demo Format |
| DM_84 file extension | Splash Damage | Wolfenstein Enemy Territory Demo Format |
| DN1 file extension | Apogee Software | Duke Nukem Episode 1 Game Format |
| DN2 file extension | Apogee Software | Duke Nukem Episode 2 Game Format |
| DN3 file extension | Apogee Software | Duke Nukem Episode 3 Game Format |
| DNA file extension | Computer Associates | CA Backup And Migration Backup Format |
| DNC file extension | Microsoft | Microsoft Windows XP Dancers Dancer Database Format |
| DND file extension | European Bioinformatics Institute | ClustalW2 Tree |
| DNE file extension | N/A | Netica Bayesian Network Text Format |
| DNF file extension | 3D Realms | Duke Nukem Forever Map Format |
| DNG file extension | Adobe Systems | Adobe Digital Negative Format |
| DNH file extension | Danmakufu | Touhou Danmakufu Game Script Format |
| DNI file extension | Cyan Worlds, Inc. | RealMyst 3D Game Archive |
| DNL file extension | DNAML | DNAML EBook Format |
| DNN file extension | DotNetNuke Corp. | DotNetNuke Manifest |
| DNP file extension | N/A | DRM Digital Rights Management |
| DNS file extension | 3D Realms | Duke Nukem Forever Save Format |
| DNT file extension | Rockwell Automation, Inc. | RSNetWorx Project |
| DNX file extension | IBM | IBM Rational Software |
| DO file extension | N/A | Java Servlet Format |
| DO2 file extension | N/A | Resident Evil 2 Door |
| DO7 file extension | Microsoft Corporation | DOS 7 |
| DOB file extension | N/A | Microsoft Visual Basic User Document Form Format |
| DOC file extension | Microsoft | Microsoft Word 97 To 2003 Document Format |
| DOC# file extension | Microsoft | Microsoft Word Document |
| DOCC file extension | TLA Systems Ltd. | DragThing Color Settings |
| DOCENX file extension | Egis Technology Inc. | Egis Encrypted Word DOC |
| DOCHTML file extension | Microsoft | Microsoft Word HTML Document Format |
| DOCK file extension | TLA Systems Ltd. | DragThing Dock |
| DOCKLET file extension | Stardock Corporation | ObjectDock Docklet |
| DOCKZIP file extension | Stardock | Stardock ObjectDock Format |
| DOCM file extension | Microsoft | Microsoft Word 2007/2010 Open XML Macro-enabled Document Format |
| DOCMHTML file extension | Microsoft | Microsoft Word MIME HTML Document Format |
| DOCSET file extension | Doxygen | Doxygen Source Code Documentation Format |
| DOCSTATES file extension | Microsoft Corporation | Microsoft Visual Studio Document Tab Well |
| DOCX file extension | Microsoft | Microsoft Word 2007/2010 Open XML Document Format |
| DOCXENX file extension | Egis Technology Inc. | Egis Encrypted Word DOCX |
| DOCXML file extension | Microsoft | Microsoft Word XML Document |
| DOCZ file extension | Hancom | ThinkFree Online Note Document |
| DOE file extension | Rockwell Automation, Inc. | Rockwell Arena Model |
| DOF file extension | Embarcadero Technologies, Inc. | Delphi Project Options |
| DOH file extension | Berkeley Softworks | Geoworks GEOS Dependency Information |
| DOI file extension | Actuate Corporation | BiRT Data Object Instance |
| DOK file extension | N/A | ASCII Text |
| DOL file extension | Nintendo | Nintendo GameCube Executable Format |
| DOLPHINVIEW file extension | Dolphin | Dolphin For KDE Folder View Settings Format |
| DON file extension | N/A | OpenOffice.org Log |
| DONE file extension | Red Hat, Inc. | Cygwin Post-install |
| DONOTPRESENT file extension | Apple, Inc. | Apple Mac OS X Time Machine Resource Fork |
| DOO file extension | N/A | Atari Doodle Image |
| DOP file extension | Voyetra Turtle Beach, Inc. | Digital Orchestrator Pro |
| DOR file extension | Digita | Digita Organiser |
| DOS file extension | Microsoft Corporation | WIN95/ DOS 7 System |
| DOST file extension | Sony Corporation | DoStudio Subtitle Format |
| DOT file extension | Microsoft | Microsoft Word 97 To 2003 Document Template Format |
| DOTHTML file extension | Microsoft | Microsoft Word HTML Document Template Format |
| DOTM file extension | Microsoft | Microsoft Word 2007/ 2010 Open XML Macro-enabled Document Template Format |
| DOTMENX file extension | Egis Technology Inc. | Egis Encrypted Word DOTM |
| DOTX file extension | Microsoft | Microsoft Word 2007 Or Word 2010 XML Document Template Format |
| DOTXENX file extension | Egis Technology Inc. | Egis Encrypted Word DOTX |
| DOV file extension | N/A | Temporary Format |
| DOWNLOAD file extension | N/A | Chrome Partial Download Format |
| DOWNLOADED file extension | ICQ LLC | ICQ 6 Hash |
| DOWNLOADHOST file extension | Microsoft | MSN Explorer Download View |
| DOWNLOADING file extension | Pando Networks | Pando Incomplete Download Format |
| DOX file extension | N/A | Microsoft Visual Basic User Document Binary Form Format |
| DOXY file extension | Dimitri van Heesch | Doxygen |
| DP file extension | N/A | Text |
| DP1 file extension | Logotron | DataPower Database Format |
| DPA file extension | Serif | Serif DrawPlus Animation Format |
| DPB file extension | N/A | FaxMaster Document |
| DPC file extension | Microsoft Corporation | Microsoft Office Resource |
| DPCACHE file extension | Apple, Inc. | Apple IPhoto Cache |
| DPD file extension | David Pilling | Ovation Pro Document |
| DPE file extension | Procedimientos-Uno, S.L. | DPwinEHE Project |
| DPF file extension | The Dargon Project | Dargon Package |
| DPG file extension | MoonShell | NDs-mPeG Video Format |
| DPI file extension | Adlib Software | Adlib Express Document Processing Information Settings |
| DPJ file extension | Embarcadero Technologies, Inc. | Borland Delphi Project |
| DPK file extension | N/A | Delphi Package Source Format |
| DPKW file extension | Embarcadero Technologies | Delphi Package |
| DPL file extension | N/A | Delphi Packed Library Format |
| DPLT file extension | Apple, Inc. | AppleScript Droplet |
| DPM file extension | Digidesign | Pro Tools Plugin Format |
| DPN file extension | Depiction | Depiction Format |
| DPO file extension | DECAdry | DECAdry Express Business Cards Business Card |
| DPP file extension | Serif | Serif DrawPlus Drawing Format |
| DPQ file extension | SoftVelocity | Clarion |
| DPR file extension | N/A | Delphi Project Format |
| DPRJ file extension | DRD Systems, Inc. | VideoReDo TVSuite DVD Project |
| DPRO file extension | Apple, Inc. | MacDraw Pro |
| DPROJ file extension | Embarcadero Technologies | Delphi Project Format |
| DPS file extension | DivX | DivX Player Skin |
| DPT file extension | Kingsoft | Kingsoft Presentation Template |
| DPV file extension | Siemens PLM Software | Siemens NX Drafting Standard Format |
| DPX file extension | Kodak | Digital Moving Picture Exchange Bitmap Format |
| DQA file extension | Interstellar Research | Daqarta Extended WAV Data |
| DQL file extension | Sapphire Group | DataEase Database |
| DQY file extension | Microsoft | Microsoft Excel ODBC Query Format |
| DR file extension | N/A | OMA Open Mobile Alliance DRM Rights Object Format |
| DR3 file extension | VMAN | V-Control Import Driver |
| DR3D file extension | Corel Corporation | CorelDream 3D Graphics |
| DR4 file extension | Knowledge Base Software | AllyCAD Drawing |
| DR8 file extension | FXpansion™ Audio UK Ltd. | DR-008 Drumkit |
| DRA file extension | Cadence Design Systems | OrCAD PCB Drawing Format |
| DRAW file extension | N/A | Acorn Vector Draw |
| DRAWING file extension | Mapdiva | Artboard Drawing Format |
| DRAWIT file extension | Bohemian Coding | DrawIt Drawing |
| DRB file extension | Dr. Software LLC | Dr. Beam |
| DRC file extension | N/A | OMA Open Mobile Alliance DRM Rights Object Format |
| DRD file extension | Allen & Heath | Allen & Heath PL Designer Document |
| DRE file extension | DÖRR EDV-Beratung | DReport Exported Report |
| DREAM file extension | Stardock | DreamMaker Animated Wallpaper Format |
| DREAMCHRONICLESSAVEDGAME file extension | KatGames | Dream Chronicles Saved Game |
| DRES file extension | Embarcadero Technologies | Delphi Compiled Resource Format |
| DRF file extension | Autodesk | VIZ Render Format |
| DRG file extension | I-Doser Labs | I-Doser Audio Drug Format |
| DRI file extension | Microsoft Corporation | Microsoft SQL Server Replication |
| DRL file extension | N/A | Gerber Drill Rack Format |
| DRM file extension | Steinberg | Cubase Drum Map Setup Format |
| DRMMETA file extension | Adobe Systems Incorporated | Adobe HTTP Dynamic Streaming DRM Additional Header |
| DRMX file extension | Drumlin Security | Drumlin Fully Secured PDF Document Format |
| DRMZ file extension | Drumlin Security | Drumlin Secured PDF Format |
| DRO file extension | DOSBox | DOSBox Raw OPL Format |
| DROPBOX file extension | Dropbox team | Dropbox |
| DRPF file extension | N/A | DinkeyRemote Parameter |
| DRPM file extension | The Fedora Project | Delta RPM Format |
| DRR file extension | Altium Limited. | Altium Designer Drill Report |
| DRS file extension | Corel Corporation | Corel WordPerfect Driver Resource |
| DRSCAN file extension | Prosoft Engineering | Data Rescue Scans Format |
| DRT file extension | Micrografx, Inc. | Micrografix Windows Draw Template |
| DRU file extension | CadSoft Computer, Inc. | EAGLE Design Rules |
| DRV file extension | N/A | Microsoft Windows Device Driver |
| DRW file extension | N/A | Vector Drawing Format |
| DRW2 file extension | N/A | Canvas 3.5 Drawing |
| DRW5 file extension | ACD Systems International Inc. | Canvas 5 Drawing |
| DRWDOT file extension | Dassault Systemes | SolidWorks Drawing Template Format |
| DRWPRP file extension | SolidWorks Corporation | SolidWorks Drawing Custom Properties Tab Template |
| DRWR file extension | Sig Software | Drop Drawers Drawer |
| DRX file extension | Adobe Systems Incorporated | Adobe Photoshop Tutorial |
| DRZ file extension | Space Telescope Science Institute | PyDrizzle Data Format |
| DS file extension | LMMS | LMMS DrumSynth Format |
| DS1 file extension | Blizzard Entertainment, Inc. | Diablo 2 Map |
| DS2 file extension | Olympus | Olympus Digital Speech Standard Format |
| DS2RES file extension | Gas Powered Games | Dungeon Siege 2 Data |
| DS4 file extension | Corel Corporation | Micrografx Designer Graphic |
| DSA file extension | DAZ Productions | DAZ Studio 3+ Script |
| DSB file extension | Orchida Soft | Orchida Embroidery System Format |
| DSC file extension | Nikon | Nikon Coolpix Disk Identification Format |
| DSD file extension | Autodesk | Autodesk AutoCAD Drawing Set Description Format |
| DSDB file extension | ANSYS Inc. | ANSYS CFX Simulation Database |
| DSE file extension | DAZ Productions | DAZ Studio Encrypted Script |
| DSF file extension | N/A | Delusion/XTracker Digital Sample |
| DSFT file extension | Microsoft Corporation | Microsoft Application Virtualization Differential SFT |
| DSG file extension | New Wave Concepts | Control Studio Document Format |
| DSGM file extension | Invisionsoft | DS Game Maker Project |
| DSH file extension | SnoopSoft | Dashboard PDA Wallpaper |
| DSI file extension | DAZ Productions | DAZ Studio Layered Image Set |
| DSIM file extension | Andreas Herz | Digital Simulator |
| DSJT= file extension | N/A | Adobe Director For Resources |
| DSK file extension | N/A | Disk Image Format |
| DSKIN file extension | Mr. Gecko | DockX Skin Format |
| DSL file extension | MacUpdate LLC | Damaged Sector List |
| DSLSETUP file extension | N/A | Domain Specific Language Setup |
| DSM file extension | N/A | Digital Sound Module Format |
| DSML file extension | N/A | Directory Services Markup Language (DSML) Identity Feed |
| DSN file extension | N/A | Microsoft Database Source Name And Settings Format |
| DSO file extension | DAZ Productions | DAZ Studio Object Format |
| DSP file extension | Microsoft | Microsoft Developer Studio Project Format |
| DSPROTOTYPE file extension | Microsoft Corporation | Microsoft Visual Studio Prototype |
| DSQ file extension | Corel Corporation | Corel Query Language |
| DSR file extension | Microsoft Corporation | Microsoft Visual Basic Active Designer |
| DSS file extension | International Voice Association | Olympus DSS Voice Format |
| DSSLIDESHOW file extension | Idea2 s.c. | Desktop Sidebar Slideshow Panel |
| DST file extension | Autodesk | AutoCAD Sheet Set Format |
| DSTL file extension | N/A | Acrobat Distiller |
| DSTUDIO file extension | Conceiva | DownloadStudio Incomplete Download Format |
| DSU file extension | Schneider Electric S.A. | ProWORX Nxt Data Setup |
| DSV file extension | DeSmuME | DeSmuME Saved Game Format |
| DSW file extension | Microsoft | Microsoft Visual Studio Workspace Format |
| DSX file extension | Numerical Computing | Diet Studio XML Format |
| DSY file extension | AJC | AJC Directory Synchronizer Project Format |
| DSYM file extension | Apple | Apple Xcode Debug Symbols Format |
| DSZ file extension | Orchida Soft | Orchida (OES) Embroidery Format |
| DS_STORE file extension | Apple | Macintosh OS X Folder Information Format |
| DT file extension | d-lusion interactive media | Drum Station Machine State Format |
| DT0 file extension | National Geospatial-Intelligence Agency | DTED Digital Terrain Elevation Data Level 0 Format |
| DT1 file extension | National Geospatial-Intelligence Agency | DTED Digital Terrain Elevation Data Level 1 Format |
| DT2 file extension | Microsoft | Microsoft Live Messenger Avatar Format |
| DT4 file extension | N/A | BioSonics Data |
| DT? file extension | Terry A. Davis | LoseThos Data |
| DTA file extension | IWIS | Chain Engineering Database Format |
| DTAPART file extension | MMIV-MMVII | DownThemAll Download Part Format |
| DTB file extension | DATACAD LLC. | DataCAD Custom Toolbar |
| DTB2 file extension | Netopia, Inc., a Motorola Company | Timbuku Pro DropIn |
| DTC file extension | Microsoft Corporation | Microsoft Windows Application Log |
| DTD file extension | N/A | Document Type Definition Format |
| DTERMLICENCE file extension | Decimus Software, Inc. | DTerm Licence |
| DTF file extension | IBM | Lotus Domino Server Temporary Format |
| DTG file extension | Desktop Music, LLC. | Desktop Guitar Score |
| DTH file extension | Microsoft Corporation | Microsoft Windows Application Log |
| DTI file extension | N/A | FIFA 2001 Data |
| DTJ file extension | Microsoft Corporation | Microsoft Windows Application Log |
| DTL file extension | Electronic Arts, Inc. | The Sims |
| DTM file extension | N/A | Audio Module |
| DTML file extension | N/A | Zope Document Template Markup Language |
| DTN file extension | IQSoft | TunnelCAD Import Or Export |
| DTO file extension | Funduc Software | Directory Toolkit Output |
| DTP file extension | Poster | Page Express Desktop Publishing Document |
| DTPROJ file extension | Microsoft Corporation | SQL Integration Services Project |
| DTR file extension | AFT | DATroniC Data Recording |
| DTS file extension | N/A | Digital Surround Audio File Format |
| DTSCONFIG file extension | Microsoft Corporation | Microsoft SQL Server Integration Services Configuration |
| DTSHD file extension | DTS | DTS-HD Master Audio Format |
| DTSX file extension | Microsoft | DTS Settings Format |
| DTT file extension | IBM | IBM AS/400 Data Transfer |
| DTV file extension | N/A | DVD2AVI Mpeg2 |
| DTW file extension | Morgan Wireless | My Better Desktop Wallpaper Format |
| DTX file extension | N/A | Documented LaTeX Source Format |
| DT_ file extension | N/A | Apple Macintosh Data Fork Format |
| DUA file extension | Electronic Arts, Inc. | FIFA 2001 Data Feart Legalscr |
| DUB file extension | N/A | Tuningwrench Audio Utility Compressed |
| DUC file extension | Datel | Action Replay Max DS Save Format |
| DUCF file extension | Microcosm Ltd. | DinkeyChange Update Code |
| DUCK file extension | Cyberduck | Cyberduck Bookmark Format |
| DUMODULE file extension | Apple, Inc. | Apple Mac OS X Disk Utility Plugin Module |
| DUMP file extension | Google BreakPad Crash Log Format | |
| DUN file extension | Trendy Entertainment | Dungeon Defenders Saved Game Format |
| DUO file extension | Microsoft Corporation | Microsoft Access |
| DUP file extension | Microsoft Corporation | Windows DUA Polling Reconfiguration |
| DUP0 file extension | Samsung Group | Samsung Kies Duplicate Media |
| DUP1 file extension | Samsung Group | Samsung Kies Duplicate Media |
| DUP2 file extension | Samsung Group | Samsung Kies Duplicate Media |
| DUS file extension | N/A | Readiris Font Dictionary Format |
| DV file extension | N/A | Digital Video Format |
| DV-AVI file extension | Microsoft | Microsoft DV-AVI Video Format |
| DV2 file extension | Larian Studios | Divine Divinity 2 Game Format |
| DV4 file extension | Bosch Security Systems | Bosch Security Systems CCTV Video Format |
| DVB file extension | Autodesk, Inc. | Autodesk AutoCAD VBA Source Code |
| DVC file extension | Nuance Communications | Dragon NaturallySpeaking Voice Command Format |
| DVD file extension | N/A | DOS Device Driver |
| DVDDATA file extension | Pegasys Inc. | TMPGEnc DVD Author Video |
| DVDFAB6 file extension | Fengtao Software Inc. | DVDFab Key |
| DVDFABHDDECRYPTER file extension | Fengtao Software Inc. | DVDFab HD Decrypter |
| DVDMEDIA file extension | The Little App Factory | RipIt DVD Backup Format |
| DVDPROJ file extension | Apple | Apple IDVD Project Format |
| DVDR file extension | N/A | DVD Master Image Format |
| DVDRIP-INFO file extension | dvd::rip team | Dvd::rip Technical Information |
| DVDS file extension | DVDStyler | DVDStyler Project Format |
| DVF file extension | Sony | Sony DV Voice Format |
| DVG file extension | Data Becker | GraphicsWorks Vector Drawing Format |
| DVI file extension | N/A | TeX Text Document (TeX Device Independent File Format) |
| DVL file extension | Dalim | Dalim Virtual Library Format |
| DVO file extension | DVO Enterprises | Cookn Cookbook Format |
| DVP file extension | Autodesk, Inc. | AutoCAD Device Parameter |
| DVR file extension | Microsoft | Microsoft Windows XP Media Center Recorded Television Format |
| DVR-MS file extension | Microsoft | Microsoft Digital Video Recording Format |
| DVS file extension | Symantec Corporation | Enterprise Vault DVS |
| DVSD file extension | N/A | DVMaster Pro Video |
| DVT file extension | inData Corporation | DepoView Digital Video Transcript |
| DVTPLUGIN file extension | Apple, Inc. | Apple Xcode DVT Extension |
| DVX file extension | DivX | DivX Movie |
| DVZ file extension | DataViz Inc. | Documents To Go Data |
| DW file extension | N/A | DavidWhittaker Audio Format |
| DW1 file extension | Matthew Walker | DeathWatch WebCrawler |
| DW2 file extension | IMSI/Design, LLC. | DesignCAD Drawing |
| DW3 file extension | Matthew Walker | DeathWatch WebCrawler |
| DWA file extension | DWA coder | Digital Waveform Archiver Audio Format |
| DWB file extension | VariCAD, s.r.o. | VariCAD Drawing |
| DWC file extension | Emulex | Emulex DWC Firmware Update File Format |
| DWD file extension | N/A | DiamondWare Digitized Format |
| DWDOC file extension | DrawWell Technologies | DrawWell Document Format |
| DWE file extension | N/A | Creator Simulator Pattern |
| DWF file extension | Autodesk | Autodesk Design Web Format |
| DWFX file extension | Autodesk | Autodesk Design Web Format |
| DWG file extension | Autodesk | AutoCAD Drawing Format |
| DWH file extension | Bentley Systems, Incorporated | WaterGems Drawing |
| DWI file extension | N/A | Dance With Intensity Format |
| DWK file extension | DSP Development Corporation | DADiSP Worksheet |
| DWL file extension | IMSI | AutoCAD Drawing Database Format Locking Information Format |
| DWL2 file extension | Autodesk, Inc. | AutoCAD Drawing Lock |
| DWLIBRARY file extension | Mariner Software | Mariner Paperless Document Library Format |
| DWM file extension | D.J. Barker | Digital Works Circuit Project |
| DWN file extension | N/A | Firmware Update Format |
| DWO file extension | N/A | Red Hat Linux DWARF Debugging Information |
| DWP file extension | ExperimentalScene | DarkWave Studio Project Format |
| DWPROJ file extension | Sybase Inc. | DataWindow Designer Project |
| DWS file extension | Autodesk | AutoCAD Standardization Format |
| DWT file extension | Adobe Systems | Adobe Dreamweaver Template Format |
| DWX file extension | Capilano Computing Systems Ltd. | DesignWorks Viewer Tools |
| DWZ file extension | Corel | Ulead DVD MovieFactory Project Format |
| DX file extension | N/A | DEC WPS/DX Text Format |
| DX2 file extension | Oracle Corporation | Oracle Siebel |
| DX7 file extension | N/A | Yamaha DX-series Raw Audio Data |
| DXB file extension | Autodesk | AutoCAD Drawing Exchange Format |
| DXE file extension | Autodesk | AutoCAD Data Extraction Template Format |
| DXF file extension | Autodesk | AutoCAD DXF Drawing Exchange Format |
| DXG file extension | Duxbury Systems, Inc. | Duxbury Braille Translator |
| DXI file extension | ZPAY Payroll Systems, Inc. | PayWindow Database |
| DXL file extension | IBM | Domino XML Format |
| DXLS file extension | Palmer Performance Engineering | DashXL Skin Set Format |
| DXML file extension | Digital Optics Limited | V++ Graphics Image |
| DXP file extension | Canneverbe | CDBurnerXP Data Compilation Format |
| DXPACK file extension | Stardock Corporation | DesktopX Object |
| DXR file extension | Adobe Systems | Adobe Director Protected Movie Format |
| DXS file extension | N/A | Deus Ex Saved Game Format |
| DXSTREAM file extension | Worldweaver | DX Studio Stream |
| DXSTUDIO file extension | Worldweaver | DX Studio Document |
| DXT file extension | LucasArts Entertainment Company, LLC | LucasArts The Secret Of Monkey Island: Special Edition Texture |
| DXT1 file extension | Microsoft Corporation | S2TC Compressed Surface |
| DXT5 file extension | N/A | S2TC Compressed Surface File (texture) |
| DXTHEME file extension | Stardock Corporation | DesktopX Windows Desktop Theme |
| DXTORYLIC file extension | Dxtory Software | Dxtory Licence |
| DXV file extension | Condrey Corporation | DocXchanger |
| DXX file extension | Autodesk | AutoCAD Drawing Interchange Attribute Format |
| DXZ file extension | N/A | Trojan Backdoor Virus |
| DYC file extension | Xerox | Xerox Printer Driver Configuration Format |
| DYLIB file extension | Apple | Xcode Dynamic Library Format |
| DYN file extension | IBM | Lotus 1-2-3 |
| DYV file extension | N/A | WORM_AUTORUN.DYV Worm |
| DYZ file extension | N/A | Backdoor.Win32.ProRat.dyz Trojan |
| DZ file extension | Dzip | Dzip Format |
| DZI file extension | Microsoft Corporation | PhotoSynth Deep Zoom Image |
| DZIP file extension | CD Projekt | The Witcher 2 Game Archive |
| DZL file extension | Dazzler Soft | DazzlerMAX |
| DZM file extension | CyberLink | Cyberlink DirectorZone Menu Template Format |
| DZP file extension | CyberLink | DirectorZone Particle Effect Format |
| DZS file extension | SpeedBit Ltd. | Download Accelerator Skin |
| DZT file extension | CyberLink | Cyberlink DirectorZone Title Template Format |
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