| 1 | D | N/A | D Source Code Format |
| 2 | D2V | N/A | DVD2AVI Format |
| 3 | D3C | Interplay Entertainment Corporation | Descent |
| 4 | D64 | N/A | Commodore 64 Disk Image |
| 5 | D80 | N/A | Commodore CBM-8050 Diskette Emulator Image |
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| 6 | DA | Procedimientos-Uno, S.L. | DAwin Project |
| 7 | DAA | PowerISO Computing | PowerISO Direct-Access-Archive |
| 8 | DAAP | N/A | Apple DAAP Playlist |
| 9 | DAE | Sony | Digital Asset Exchange Format |
| 10 | DAILY | N/A | Day log |
| 11 | DAO | N/A | Disk At Once CD/DVD Image |
| 12 | DAQ | MathWorks, Inc. | Data Acquisition Toolbox |
| 13 | DARKEST | N/A | Darkest Dungeon game script |
| 14 | DART | Google | Apple Mac OS X DiskImageMounter DART Image |
| 15 | DAS | Bissantz | DeltaMaster Analysis Session |
| 16 | DASH | Dashlane, Inc. | Dashlane Profile |
| 17 | DATA | Appricon | Analysis Studio Offline Data Format |
| 18 | DAU | NCH Software Pty Ltd | Express Dictate Dictate Record |
| 19 | DAV | DVR365 | DVR365 Video Format |
| 20 | DB | N/A | Database Format |
| 21 | DB-JOURNAL | SQLite Development Team | SQLite Database Journal |
| 22 | DB.CRYPT5 | N/A | WhatsApp Messenger encrypted message database backup |
| 23 | DB.CRYPT7 | N/A | WhatsApp Messenger encrypted message database backup |
| 24 | DB.CRYPT8 | WhatsApp | WhatsApp Encrypted Database File |
| 25 | DB1 | Tekla | Tekla Structures Model Format |
| 26 | DB2 | dataBased Intelligence | DBASE II Database |
| 27 | DB3 | SQLite | SQLite Database Format |
| 28 | DB5 | GSC Game World | S.T.A.L.K.E.R. Game |
| 29 | DB6 | GSC Game World | S.T.A.L.K.E.R. Game |
| 30 | DB7 | GSC Game World | S.T.A.L.K.E.R. Game |
| 31 | DB8 | GSC Game World | S.T.A.L.K.E.R. Game |
| 32 | DB9 | GSC Game World | S.T.A.L.K.E.R. Game |
| 33 | DBF | dBASE | Database Format |
| 34 | DBFSEVENTSD | N/A | Mac OS X data |
| 35 | DBG | Microsoft | FoxPro Debugger Configuration |
| 36 | DBK | Amrak Software | OrCAD Schematic Capture Backup Format |
| 37 | DBL | DAZ Productions | DAZ Brick Light Format |
| 38 | DBM | Adobe Systems | ColdFusion Server Format |
| 39 | DBML | Microsoft | Visual Studio OR Design Format |
| 40 | DBP | Microsoft Corporation | Microsoft Visual Studio Visual C++ Database Project |
| 41 | DBPF | N/A | Maxis Database Packed Format |
| 42 | DBPROJ | Microsoft | Visual Studio Database Project Format |
| 43 | DBQ | Corel Corporation | Paradox Memo Format |
| 44 | DBS | Unify | SQLBase Database Format |
| 45 | DBT | dBASE | Database Text Format |
| 46 | DBX | Microsoft | Outlook Express E-mail Folder |
| 47 | DC2 | Kodak | Kodak DC25 Digital Camera Format |
| 48 | DC3 | IMSI/Design | Medicine Image Format |
| 49 | DCM | NEMA | DICOM Image |
| 50 | DCO | COSECT, Ltd. | DisCryptor Encrypted Archive |
| 51 | DCPR | Adobe Systems | Adobe DNG Camera Profile Recipe Format |
| 52 | DCR | Kodak | Kodak RAW Image Format |
| 53 | DCS | Quark Software | Desktop Color Separation Format |
| 54 | DCT | N/A | Dictionary Format |
| 55 | DCT5 | Microsoft Corporation | Microsoft Word 5 For Mac Dictionary |
| 56 | DCTX | Microsoft Corporation | Microsoft Office IME Open Extended Dictionary |
| 57 | DCU | Embarcadero Technologies | Delphi Compiled Unit |
| 58 | DCX | ZSoft | FoxPro Database Index |
| 59 | DD | Symantec | Doodle C64 Image Format |
| 60 | DDD | Adobe | Adobe Distiller Format |
| 61 | DDL | N/A | Data Definition Language Format |
| 62 | DDS | Microsoft | DirectDraw Surface |
| 63 | DE | DrawExpress | German Language Translation |
| 64 | DEA | N/A | Generic |
| 65 | DEB | Debian Project | Debian Software Package |
| 66 | DECTEST | N/A | Decimal test data |
| 67 | DEF | Elecbyte | Module-Definition Format |
| 68 | DEFAULTSITE | N/A | 1&1 defaultsite |
| 69 | DEFINITION | Apple, Inc. | Apple Mac OS X Automator Data Type Definition |
| 70 | DELF | N/A | Malicious Or Virus |
| 71 | DEM | Valve | Video Game Demo Format |
| 72 | DEMO4 | N/A | UT2004 Demo |
| 73 | DEP | Microsoft | Windows Dependency Format |
| 74 | DER | N/A | DER Certificate Format |
| 75 | DES | Corel | Corel Designer Format |
| 76 | DESC | Electronic Arts | Battlefield 2 Map Description Format |
| 77 | DESIGN | Microsoft | Microsoft Expression Design Drawing |
| 78 | DESKSOFTLICENSE | N/A | DeskSoft License |
| 79 | DESKTHEMEPACK | Microsoft | Windows 8 Desktop Theme Pack Format |
| 80 | DESKTOP | N/A | Desktop Entry Format |
| 81 | DEVICEIDS | Apple | Device Identification FIle |
| 82 | DEVICEINFO | Apple | Device Record |
| 83 | DEVICEMETADATA-MS | Microsoft Corporation | Microsoft Windows 7 Device Metadata Package |
| 84 | DEVPAK | Bloodshed | Dev-C++ Developer Package |
| 85 | DEVX | Rick Meyers | E-sword Devotional |
| 86 | DEWF | N/A | SoundEdit Recorded Instrument |
| 87 | DEX | Google | Dalvik Executable Format |
| 88 | DF | Corel Corporation | Corel Paradox Table Filter |
| 89 | DFE | RISCOS Ltd. | RISC OS Comma Separated Value |
| 90 | DFF | N/A | RenderWare Model Format |
| 91 | DFN | N/A | Delphi Definition |
| 92 | DFONT | N/A | Mac OS X Data Fork Font |
| 93 | DFU | Apple | IOS DFU Format |
| 94 | DFV | Microsoft Corporation | MS Office Word Print Format Template |
| 95 | DFX | Autodesk | Drafix CAD Format |
| 96 | DFXP | N/A | Timed Text Markup Language |
| 97 | DGF | Trimble Navigation Limited | GPS Pathfinder Office Geoid Grid |
| 98 | DGN | Bentley Systems | MicroStation Design Format |
| 99 | DHE | Microsoft Corporation | Microsoft Help Workshop Dialog Box Help Editor Document |
| 100 | DHTML | N/A | Dynamic HTML Format |
| 101 | DIAGCAB | Microsoft | Troubleshooting Pack Cabinet Format |
| 102 | DIAGCFG | Microsoft | Troubleshooting Pack Configuration Format |
| 103 | DIAGPKG | Microsoft | Troubleshooting Pack Format |
| 104 | DIAGSESSION | Microsoft | Diagnostics Session File |
| 105 | DIB | Microsoft | Device Independent Bitmap Format |
| 106 | DIC | N/A | Dictionary Format |
| 107 | DICM | N/A | Medicine Image |
| 108 | DICOM | NEMA | DICOM Image Format |
| 109 | DIE | Blizzard Entertainment, Inc. | Diablo Item |
| 110 | DIF | Microsoft | Data Interchange Format |
| 111 | DIFF | Matt Mackall | Diff Source |
| 112 | DIMG | N/A | Mac Disk Image |
| 113 | DIR | Adobe Systems | Adobe Director Movie |
| 114 | DIR00 | N/A | Disk Defrag Error Or Dump |
| 115 | DISK | N/A | Linux Virtual Hard Disk |
| 116 | DISKDEFINES | N/A | Linux LiveCD Information Format |
| 117 | DIST | Apple | Mac OS X Distribution Script |
| 118 | DIVX | DivX | DivX-Encoded Movie Format |
| 119 | DIZ | N/A | Description In Zip Format |
| 120 | DJV | LizardTech | DjVu Image |
| 121 | DJVU | LizardTech | DjVu Image |
| 122 | DKZ | N/A | ZIP Description Text |
| 123 | DLB | N/A | Troj/Dloadr-AHT |
| 124 | DLI | N/A | Win32.Sober.AD@mm |
| 125 | DLL | Microsoft | Dynamic Link Library |
| 126 | DLLX | N/A | Backdoor.Bot |
| 127 | DLL_NON_OPT | Adobe Systems Incorporated | Adobe |
| 128 | DLM | Akamai | Akamai Download Manager Format |
| 129 | DLP | Microsoft Corporation | DirectMusic Producer DLS |
| 130 | DLS | N/A | Downloadable Sounds Format |
| 131 | DLV | Dassault Systemes | CATIA 4 Export Format |
| 132 | DLV4 | Dassault Systèmes S.A. | Catia |
| 133 | DMG | Apple | Mac OS X Disk Image |
| 134 | DMGPART | Apple | Mac OS X Disk Image Part |
| 135 | DML | Dynascript Technologies | DynaScript Format |
| 136 | DMP | Microsoft | Windows Memory Dump |
| 137 | DMV | Adobe Systems Incorporated | Adobe Acrobat Catalog |
| 138 | DNG | Adobe Systems | Digital Negative Image Format |
| 139 | DNI | Cyan Worlds, Inc. | RealMyst 3D Game Archive |
| 140 | DNP | N/A | DRM Digital Rights Management |
| 141 | DNX | IBM | IBM Rational Software |
| 142 | DO | N/A | Java Servlet |
| 143 | DOB | N/A | Visual Basic UserDocument |
| 144 | DOC | Microsoft | Microsoft Word Document |
| 145 | DOC# | LibreOffice | LibreOffice Document Lock File |
| 146 | DOCHTML | Microsoft | Microsoft Word HTML Document |
| 147 | DOCKTILEPLUGIN | N/A | Apple Mac OS X app plugin file |
| 148 | DOCM | Microsoft | Word Open XML Macro-Enabled Document |
| 149 | DOCSET | Doxygen | Doxygen Document Set Format |
| 150 | DOCSTATES | Microsoft Corporation | Microsoft Visual Studio Document Tab Well |
| 151 | DOCX | Microsoft | Microsoft Word Open XML Document |
| 152 | DOF | DOSBox | DOSBox Capture Movie |
| 153 | DOK | SoftwareOK | ASCII Text |
| 154 | DOLPHINVIEW | Dolphin | Dolphin Folder View Settings Format |
| 155 | DOM | N/A | Generic |
| 156 | DONOTPRESENT | Apple, Inc. | Apple Mac OS X Time Machine Resource Fork |
| 157 | DOO | N/A | Atari Doodle Image |
| 158 | DOS | Microsoft Corporation | WIN95/ DOS 7 System |
| 159 | DOST | Sony Corporation | DoStudio Subtitle Format |
| 160 | DOT | Microsoft | Word Document Template |
| 161 | DOTHTML | Microsoft | Microsoft Word HTML Document Template |
| 162 | DOTM | Microsoft | Word Open XML Macro-Enabled Document Template |
| 163 | DOTX | Microsoft | Word Open XML Document Template |
| 164 | DOWNLOAD | Apple | Partially Downloaded Format |
| 165 | DOX | N/A | Visual Basic Binary UserDocument |
| 166 | DPG | MoonShell | Nintendo DS Movie Format |
| 167 | DPK | Embarcadero Technologies | Delphi Package |
| 168 | DPKW | Embarcadero Technologies | Delphi Package |
| 169 | DPLT | Apple, Inc. | AppleScript Droplet |
| 170 | DPR | Embarcadero Technologies | Delphi Project |
| 171 | DPROJ | Embarcadero Technologies | Delphi Project |
| 172 | DPX | SMPTE | Digital Picture Exchange Format |
| 173 | DQY | Microsoft | Excel Query Format |
| 174 | DRAW | N/A | Acorn Vector Draw |
| 175 | DREAM | Stardock | Dream Animated Wallpaper Format |
| 176 | DRO | DOSBox | DOSBox Raw OPL Format |
| 177 | DROPBOX | Dropbox team | Dropbox |
| 178 | DRP | Blackmagic Design | DaVinci Resolve Project |
| 179 | DRS | Corel Corporation | Corel WordPerfect Driver Resource |
| 180 | DRT | Cadence Design Systems, Inc. | PSpice Or PCB Designer Custom Derating |
| 181 | DRW | Corel | Drawing Format |
| 182 | DRX | Adobe Systems Incorporated | Adobe Photoshop Tutorial |
| 183 | DS1 | Blizzard Entertainment, Inc. | Diablo 2 Map |
| 184 | DS2 | Olympus | Olympus DSS Pro Audio Format |
| 185 | DS4 | Corel Corporation | Micrografx Designer Graphic |
| 186 | DSD | Autodesk | AutoCAD Drawing Set Description Format |
| 187 | DSF | DAZ Productions | DAZ Studio Asset Format |
| 188 | DSK | N/A | Disk Image |
| 189 | DSM | N/A | Digital Sound Module |
| 190 | DSML | N/A | Directory Services Markup Language (DSML) Identity Feed |
| 191 | DSN | Cadence Design Systems | Database Source Name Format |
| 192 | DSR | Corel Corporation | Micrografx Designer Graphic |
| 193 | DSS | International Voice Association | Digital Speech Standard Format |
| 194 | DSW | Microsoft | Visual C++ 6 Workspace Format |
| 195 | DSZ | Orchida Soft | Orchida (OES) Embroidery Format |
| 196 | DS_STORE | Apple | Mac OS X Folder Settings Format |
| 197 | DT0 | National Geospatial-Intelligence Agency | DTED Level 0 Format |
| 198 | DT1 | National Geospatial-Intelligence Agency | DTED Level 1 Format |
| 199 | DTA | IWIS | Data Format |
| 200 | DTD | N/A | Document Type Definition Format |
| 201 | DTI | N/A | Fifa 2001 Data |
| 202 | DTL | Electronic Arts, Inc. | The Sims |
| 203 | DTM | N/A | Audio Module |
| 204 | DTSCONFIG | Microsoft Corporation | Microsoft SQL Server Integration Services Configuration |
| 205 | DTX | N/A | Documented LaTeX Format |
| 206 | DU2 | N/A | Atari ST picture image |
| 207 | DUMP | Google | Google BreakPad Crash Log Format |
| 208 | DUN | Trendy Entertainment | Dungeon Defenders Saved Game Format |
| 209 | DUO | Microsoft Corporation | Microsoft Access |
| 210 | DUP0 | Samsung Group | Samsung Kies Duplicate Media |
| 211 | DUP1 | Samsung Group | Samsung Kies Duplicate Media |
| 212 | DUP2 | Samsung Group | Samsung Kies Duplicate Media |
| 213 | DV | N/A | Digital Video Format |
| 214 | DV-AVI | Microsoft | Microsoft DV-AVI Video Format |
| 215 | DV4 | Bosch Security Systems | Bosch Security Systems CCTV Video Format |
| 216 | DVB | Autodesk | DVBLine Document |
| 217 | DVD | SlySoft | CloneCD DVD Information Format |
| 218 | DVDFAB6 | Fengtao Software Inc. | DVDFab Key |
| 219 | DVDMEDIA | The Little App Factory | RipIt DVD Package |
| 220 | DVDR | N/A | DVD/CD-R Master Image |
| 221 | DVF | Sony | Sony Digital Voice Format |
| 222 | DVI | N/A | Device Independent Format |
| 223 | DVR | Microsoft | Microsoft Recorded TV Show |
| 224 | DVR-MS | Microsoft | Microsoft Digital Video Recording |
| 225 | DVX | DivX | DivX Video Format |
| 226 | DWF | Autodesk | Design Web Format |
| 227 | DWFX | Autodesk | Design Web Format XPS Format |
| 228 | DWG | Autodesk | AutoCAD Drawing Database Format |
| 229 | DWL | IMSI | TurboCAD Drawing Lock Format |
| 230 | DWP | ExperimentalScene | DarkWave Studio Project Format |
| 231 | DWT | Adobe Systems | Dreamweaver Web Page Template |
| 232 | DXB | Autodesk | Drawing Exchange Binary |
| 233 | DXF | Autodesk | Drawing Exchange Format |
| 234 | DXG | Duxbury Systems, Inc. | Duxbury Braille Translator |
| 235 | DXI | ZPAY Payroll Systems, Inc. | PayWindow Database |
| 236 | DXPACK | Stardock Corporation | DesktopX Object |
| 237 | DXR | Adobe Systems | Protected Macromedia Director Movie |
| 238 | DXSTUDIO | Worldweaver | DX Studio Document |
| 239 | DXTHEME | Stardock Corporation | DesktopX Windows Desktop Theme |
| 240 | DXZ | N/A | Trojan Backdoor Virus |
| 241 | DYV | N/A | WORM_AUTORUN.DYV Worm |
| 242 | DYZ | N/A | Backdoor.Win32.ProRat.dyz Trojan |
| 243 | DZ | Dzip | Dzip Format |
| 244 | DZIP | CD Projekt | The Witcher 2 Game Archive |
