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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .D02 | Cadence Design Systems | Data Files | MicroSim PCBoard NC Drill Data File | OrCAD PCB Designer | Cadence Design Systems |
| .D03 | Interscape | Data Files | Jydivide Split File | Jydivide | Interscape |
| .D04 | Cadence Design Systems | Data Files | MicroSim PCBoard NC Drill Data File | OrCAD PCB Designer | Cadence Design Systems |
| .D05 | Cadence Design Systems | Data Files | MicroSim PCBoard NC Drill Data File | OrCAD PCB Designer | Cadence Design Systems |
| .D06 | Cadence Design Systems | Data Files | MicroSim PCBoard NC Drill Data File | OrCAD PCB Designer | Cadence Design Systems |
| .D07 | Cadence Design Systems | Data Files | MicroSim PCBoard NC Drill Data File | OrCAD PCB Designer | Cadence Design Systems |
| .D10 | TaxAct | Data Files | Drake Software Data File | Drake Software | Drake Software |
| .D11 | NorthStar Solutions | Data Files | Macro Mania Data File | Macro Mania | NorthStar Solutions |
| .D3P | UnitedPrint.com | Data Files | DigitalPrintLab Data | DigitalPrintLab | UnitedPrint.com |
| .D4C | Open Source | Data Files | Dataphor Data File | Dataphor | Open Source |
| .D71 | Commodore International | Data Files | Commodore Emulator Data | VICE | Open Source |
| .D83 | GAEB | Data Files | GAEB 1990 Data | GAEB data exchange XML | GAEB |
| .DA2 | Microsoft Corporation | Data Files | Windows Dancer File | Windows Media Center | Microsoft Corporation |
| .DAB | Epigon Media Technologies | Data Files | Digital Audio Broadcasting Audio Data | DMB Player | Epigon Media Technologies |
| .DAC | Dynacom Technologies | Data Files | Dynacom Accounting Data | Dynacom Accounting | Dynacom Technologies |
| .DAF | Telecompute Integrated Systems Inc. | Data Files | Digital Anchor File | Digital Anchor | Telecompute Integrated Systems Inc. |
| .DAI | Dreamaquarium.com | Data Files | Dream Aquarium Patch File | Dream Aquarium | Dreamaquarium.com |
| .DAL | Mediachance | Data Files | DVD-lab Project File | DVD-lab | Mediachance |
| .DAN | DanMedical | Data Files | D-MAS Analysis System Patient Data File | D-MAS | DanMedical |
| .DAP | SpeedBit | Data Files | Download Accelerator Plus Partial Download | Download Accelerator Plus | SpeedBit |
| .DAS | Bissantz | Data Files | DeltaMaster Analysis Session | DeltaMaster | Bissantz |
| .DAT | Unknown Developer | Data Files | Game Data | Dragon UnPACKer | Open Source |
| .DATA | Appricon | Data Files | Analysis Studio Offline Data | Microsoft Excel | Microsoft Corporation |
| .DATAGRABBER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .DATE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .DAVE | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .DAW | Hasbro | Data Files | Hasbro Scrabble CDROM OWL2 List File | Hasbro Scrabble CD-ROM | Hasbro |
| .DAYS | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .DA_ | GkWare e.K. | Data Files | GKSetup Support Data | GkSetup | GkWare e.K. |
| .DB | Dwayne Richard Hipp | Data Files | Mobile Device Database File | SQLite | Dwayne Richard Hipp |
| .DB-MAIN | Rever | Data Files | DB-MAIN Project File | DB-MAIN | Rever |
| .DB0 | dBase, LLC | Data Files | dBASE Init File | dBase | dBase, LLC |
| .DBA | PDC (Prolog Development Center) | Data Files | Turbo Prolog Database | Visual Prolog | PDC (Prolog Development Center) |
| .DBB | GSC Game World | Data Files | S.T.A.L.K.E.R. Game File | S.T.A.L.K.E.R | GSC Game World |
| .DBC | Microsoft Corporation | Data Files | FoxPro Database File | Microsoft Visual FoxPro | Microsoft Corporation |
| .DBD | Macrovision Corporation | Data Files | DemoShield Project | DemoShield | Macrovision Corporation |
| .DBF | dBase, LLC | Data Files | Database File | Microsoft Excel | Microsoft Corporation |
| .DBO | The Game Creators | Data Files | DarkBASIC Object | The Game Creators DarkBASIC Pro | The Game Creators |
| .DBQ | Corel | Data Files | Corel Paradox Memo Data | Corel Paradox | Corel |
| .DBT | Abacus Data Systems | Data Files | AbacusLaw Data File | AbacusLaw | Abacus Data Systems |
| .DBU | Unknown Developer | Data Files | Client-Course Manager Database Expansion Update | Unknown Software | Unknown Developer |
| .DCF | Sony Mobile Communications | Data Files | DRM Content Format File | DRM Packager | Sony Mobile Communications |
| .DCI | AOL | Data Files | AOL Mail HTML Mail | AOL Mail | AOL |
| .DCK | Zeljko Juric and Samir Ribic | Data Files | Warajevo ZX Spectrum Emulation Data | Warajevo | Zeljko Juric and Samir Ribic |
| .DCL | Autodesk, Inc. | Data Files | AutoCAD Dialog Definition File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .DCM | National Electrical Manufacturers Association (NEMA) | Data Files | DICOM Image File Format | Adobe Photoshop | Adobe Systems Incorporated |
| .DCMD | Fujiwara Software | Data Files | DiskCatalogMaker Thumbnail-Enabled Catalog | DiskCatalogMaker | Fujiwara Software |
| .DCP | Embarcadero Technologies | Data Files | Delphi Compiled Package | Delphi (IDE) | Embarcadero Technologies |
| .DCS | Quark Software Inc. | Data Files | Desktop Color Separation File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .DCT | Microsoft Corporation | Data Files | Dictionary File | QuarkXPress | Quark Software Inc. |
| .DCTX | Microsoft Corporation | Data Files | Microsoft Office IME Open Extended Dictionary | Microsoft Office | Microsoft Corporation |
| .DCTXC | Microsoft Corporation | Data Files | Microsoft Office IME Open Extended Dictionary File | Microsoft Office | Microsoft Corporation |
| .DD | Sage | Data Files | Sage MAS 90 Data File | Sage MAS 90 | Sage |
| .DDA | MicroImages | Data Files | TNTmips Import File Format | TNTmips | MicroImages |
| .DDB | Avid Technology | Data Files | Digidesign Database | Avid Pro Tools | Avid Technology |
| .DDC | Daren Softwares | Data Files | DivX Descriptor File | DivX | DivX, LLC. |
| .DDE | ABBYY | Data Files | File TypeLingvo Dictionary Error Log File | ABBYY Lingvo Dictionary | ABBYY |
| .DDT | Sports Interactive | Data Files | Football Manager Keep Player Data File | Football Manager 2016 | Sports Interactive |
| .DDW | Dream Design Entertainment Software | Data Files | GLBasic World File | GLBasic | Dream Design Entertainment Software |
| .DEBIAN | Debian | Data Files | Debian Related File | Debian software (dpkg) | Open Source |
| .DEBUG | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .DEC | Various Developers | Data Files | Declaration File | Microsoft Notepad | Microsoft Corporation |
| .DEE | Simlab at Tufts University's Department of Electrical and Computer Engineering | Data Files | Creator Simulator Description Data File | Simulation Library Creator | Simlab at Tufts University's Department of Electrical and Computer Engineering |
| .DEF | Microsoft Corporation | Data Files | Module Definition File | Microsoft Visual Studio | Microsoft Corporation |
| .DEFAULT | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .DEI | Open Source | Data Files | Gerber Design Engineered Interface | Altium Designer | Altium |
| .DEL | Apple | Data Files | Apple Safari | Apple Safari | Apple |
| .DESD | VIVA | Data Files | VIVA Designer Template | VIVA Designer | VIVA |
| .DET | Sage | Data Files | Sage ACT! 5 Email Message | Act! | Swiftpage, Inc. |
| .DEU | Adobe Systems Incorporated | Data Files | Adobe Reader German Language File | Adobe Reader | Adobe Systems Incorporated |
| .DEV | Bloodshed Software | Data Files | Dev-C++ Project File | Dev-C++ | Bloodshed Software |
| .DEZ | Datanamic Solutions BV | Data Files | DeZign For Databases Project | DeZign | Datanamic Solutions BV |
| .DFA | Unknown Developer | Data Files | Amateur Strip Poker Data | Amature Strip Poker | Unknown Developer |
| .DFD | Open Source | Data Files | ABC Dyadic Functions Data | ABC Programming langauge | Open Source |
| .DFL | Fresh Devices | Data Files | Fresh Download List | Fresh Download | Fresh Devices |
| .DFM | Open Source | Data Files | Pascal File | Notepad++ | Don Ho |
| .DFP | Blackmagic Design | Data Files | Fusion Plugin File | Fusion 9 | Blackmagic Design |
| .DFR | SmartWare Corporation | Data Files | SmartWare Report Definition File | SmartWare | SmartWare Corporation |
| .DFS | Open Source | Data Files | BrainSuite Surface File | BrainSuite | Open Source |
| .DFW | SmartWare Corporation | Data Files | SmartWare Cross-tab Definition | SmartWare | SmartWare Corporation |
| .DGC | Shin-ichi Tsuruta | Data Files | DGCA File Archive | DGCA | Shin-ichi Tsuruta |
| .DGI | Buzzqw | Data Files | HDConvertToX Input Data | HDConvertToX | Buzzqw |
| .DGM | IBM | Data Files | IBM Lotus Freelance Graphics Diagram Data | Lotus Freelance Graphics | IBM |
| .DGO | Dell Technologies | Data Files | EqualLogic Diagnostic Log | Dell EqualLogic | Dell Technologies |
| .DGS | TES | Data Files | Dagesh Pro Document | TES Dagesh Pro | TES |
| .DGSCHEME-WEB | GipsyMedia Ltd | Data Files | DigiGuide TV Scheme | DigiGuide | GipsyMedia Ltd |
| .DGT | Interscape | Data Files | Digital Gallery File | Digital Gallery | Interscape |
| .DGX | IBM | Data Files | IBM Rational XDE Diagram | Rational XDE | IBM |
| .DH | Geoworks Ensemble | Data Files | Dependency Information File | Breadbox Ensemble | Breadbox Computer Company |
| .DHCD | DHCD Computing | Data Files | DHCD Computing Application Data File | DHCD Computing File Sniffer | DHCD Computing |
| .DHI | Unknown Developer | Data Files | DriverHound Index File | DriverHound | Unknown Developer |
| .DHR | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .DHT | APTECH | Data Files | GAUSS Data Set Header File | Aptech GAUSS | Interscape |
| .DHY | Adobe Systems Incorporated | Data Files | Adobe Bridge Information File | Adobe Bridge CC | Adobe Systems Incorporated |
| .DICT | Microsoft Corporation | Data Files | Dictionary File | QuarkXPress | Quark Software Inc. |
| .DID | RICOH | Data Files | IKON DISC Image Document Identifier | IKON DISC image | RICOH |
| .DIF | Microsoft Corporation | Data Files | Data Interchange Format | Microsoft Excel | Microsoft Corporation |
| .DII | Ken Hamilton | Data Files | TypeSummation Batch Load File | CT Summation iBlaze or WebBlaze | Ken Hamilton |
| .DIL | Embarcadero Technologies | Data Files | Delphi File | Delphi (IDE) | Embarcadero Technologies |
| .DIP | Microsoft Corporation | Data Files | Windows Bitmap Format | Microsoft Windows | Microsoft Corporation |
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