| .DAC | Dynacom Technologies | Arquivos de dados | Dynacom Accounting Data | Dynacom Accounting | Dynacom Technologies |
| .DAF | Telecompute Integrated Systems Inc. | Arquivos de dados | Digital Anchor File | Digital Anchor | Telecompute Integrated Systems Inc. |
| .DAI | Dreamaquarium.com | Arquivos de dados | Dream Aquarium Patch File | Dream Aquarium | Dreamaquarium.com |
| .DAL | Mediachance | Arquivos de dados | DVD-lab Project File | DVD-lab | Mediachance |
| .DAN | DanMedical | Arquivos de dados | D-MAS Analysis System Patient Data File | D-MAS | DanMedical |
| .DAP | SpeedBit | Arquivos de dados | Download Accelerator Plus Partial Download | Download Accelerator Plus | SpeedBit |
| .DAS | Bissantz | Arquivos de dados | DeltaMaster Analysis Session | DeltaMaster | Bissantz |
| .DAT | Unknown Developer | Arquivos de dados | Game Data | Dragon UnPACKer | Open Source |
| .DATA | Appricon | Arquivos de dados | Analysis Studio Offline Data | Microsoft Excel | Microsoft Corporation |
| .DATAGRABBER | Apple | Arquivos de dados | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .DATE | Apple | Arquivos de dados | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .DAVE | Unknown Developer | Arquivos de dados | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .DAW | Hasbro | Arquivos de dados | Hasbro Scrabble CDROM OWL2 List File | Hasbro Scrabble CD-ROM | Hasbro |
| .DAYS | Unknown Developer | Arquivos de dados | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .DA_ | GkWare e.K. | Arquivos de dados | GKSetup Support Data | GkSetup | GkWare e.K. |
| .DB | Dwayne Richard Hipp | Arquivos de dados | Mobile Device Database File | SQLite | Dwayne Richard Hipp |
| .DB-MAIN | Rever | Arquivos de dados | DB-MAIN Project File | DB-MAIN | Rever |
| .DB0 | dBase, LLC | Arquivos de dados | dBASE Init File | dBase | dBase, LLC |
| .DBA | PDC (Prolog Development Center) | Arquivos de dados | Turbo Prolog Database | Visual Prolog | PDC (Prolog Development Center) |
| .DBB | GSC Game World | Arquivos de dados | S.T.A.L.K.E.R. Game File | S.T.A.L.K.E.R | GSC Game World |
| .DBC | Microsoft Corporation | Arquivos de dados | FoxPro Database File | Microsoft Visual FoxPro | Microsoft Corporation |
| .DBD | Macrovision Corporation | Arquivos de dados | DemoShield Project | DemoShield | Macrovision Corporation |
| .DBF | dBase, LLC | Arquivos de dados | Database File | Microsoft Excel | Microsoft Corporation |
| .DBO | The Game Creators | Arquivos de dados | DarkBASIC Object | The Game Creators DarkBASIC Pro | The Game Creators |
| .DBQ | Corel | Arquivos de dados | Corel Paradox Memo Data | Corel Paradox | Corel |
| .DBT | Abacus Data Systems | Arquivos de dados | AbacusLaw Data File | AbacusLaw | Abacus Data Systems |
| .DBU | Unknown Developer | Arquivos de dados | Client-Course Manager Database Expansion Update | Unknown Software | Unknown Developer |
| .DCF | Sony Mobile Communications | Arquivos de dados | DRM Content Format File | DRM Packager | Sony Mobile Communications |
| .DCI | AOL | Arquivos de dados | AOL Mail HTML Mail | AOL Mail | AOL |
| .DCK | Zeljko Juric and Samir Ribic | Arquivos de dados | Warajevo ZX Spectrum Emulation Data | Warajevo | Zeljko Juric and Samir Ribic |
| .DCL | Autodesk, Inc. | Arquivos de dados | AutoCAD Dialog Definition File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .DCM | National Electrical Manufacturers Association (NEMA) | Arquivos de dados | DICOM Image File Format | Adobe Photoshop | Adobe Systems Incorporated |
| .DCMD | Fujiwara Software | Arquivos de dados | DiskCatalogMaker Thumbnail-Enabled Catalog | DiskCatalogMaker | Fujiwara Software |
| .DCP | Embarcadero Technologies | Arquivos de dados | Delphi Compiled Package | Delphi (IDE) | Embarcadero Technologies |
| .DCS | Quark Software Inc. | Arquivos de dados | Desktop Color Separation File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .DCT | Microsoft Corporation | Arquivos de dados | Dictionary File | QuarkXPress | Quark Software Inc. |
| .DCTX | Microsoft Corporation | Arquivos de dados | Microsoft Office IME Open Extended Dictionary | Microsoft Office | Microsoft Corporation |
| .DCTXC | Microsoft Corporation | Arquivos de dados | Microsoft Office IME Open Extended Dictionary File | Microsoft Office | Microsoft Corporation |
| .DD | Sage | Arquivos de dados | Sage MAS 90 Data File | Sage MAS 90 | Sage |
| .DDA | MicroImages | Arquivos de dados | TNTmips Import File Format | TNTmips | MicroImages |
| .DDB | Avid Technology | Arquivos de dados | Digidesign Database | Avid Pro Tools | Avid Technology |
| .DDC | Daren Softwares | Arquivos de dados | DivX Descriptor File | DivX | DivX, LLC. |
| .DDE | ABBYY | Arquivos de dados | File TypeLingvo Dictionary Error Log File | ABBYY Lingvo Dictionary | ABBYY |
| .DDT | Sports Interactive | Arquivos de dados | Football Manager Keep Player Data File | Football Manager 2016 | Sports Interactive |
| .DDW | Dream Design Entertainment Software | Arquivos de dados | GLBasic World File | GLBasic | Dream Design Entertainment Software |
| .DEBIAN | Debian | Arquivos de dados | Debian Related File | Debian software (dpkg) | Open Source |
| .DEBUG | Unknown Developer | Arquivos de dados | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .DEC | Various Developers | Arquivos de dados | Declaration File | Microsoft Notepad | Microsoft Corporation |
| .DEE | Simlab at Tufts University's Department of Electrical and Computer Engineering | Arquivos de dados | Creator Simulator Description Data File | Simulation Library Creator | Simlab at Tufts University's Department of Electrical and Computer Engineering |
| .DEF | Microsoft Corporation | Arquivos de dados | Module Definition File | Microsoft Visual Studio | Microsoft Corporation |
| .DEFAULT | Apple | Arquivos de dados | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .DEI | Open Source | Arquivos de dados | Gerber Design Engineered Interface | Altium Designer | Altium |
| .DEL | Apple | Arquivos de dados | Apple Safari | Apple Safari | Apple |
| .DESD | VIVA | Arquivos de dados | VIVA Designer Template | VIVA Designer | VIVA |
| .DET | Sage | Arquivos de dados | Sage ACT! 5 Email Message | Act! | Swiftpage, Inc. |
| .DEU | Adobe Systems Incorporated | Arquivos de dados | Adobe Reader German Language File | Adobe Reader | Adobe Systems Incorporated |
| .DEV | Bloodshed Software | Arquivos de dados | Dev-C++ Project File | Dev-C++ | Bloodshed Software |
| .DEZ | Datanamic Solutions BV | Arquivos de dados | DeZign For Databases Project | DeZign | Datanamic Solutions BV |
| .DFA | Unknown Developer | Arquivos de dados | Amateur Strip Poker Data | Amature Strip Poker | Unknown Developer |
| .DFD | Open Source | Arquivos de dados | ABC Dyadic Functions Data | ABC Programming langauge | Open Source |
| .DFL | Fresh Devices | Arquivos de dados | Fresh Download List | Fresh Download | Fresh Devices |
| .DFM | Open Source | Arquivos de dados | Pascal File | Notepad++ | Don Ho |
| .DFP | Blackmagic Design | Arquivos de dados | Fusion Plugin File | Fusion 9 | Blackmagic Design |
| .DFR | SmartWare Corporation | Arquivos de dados | SmartWare Report Definition File | SmartWare | SmartWare Corporation |
| .DFS | Open Source | Arquivos de dados | BrainSuite Surface File | BrainSuite | Open Source |
| .DFW | SmartWare Corporation | Arquivos de dados | SmartWare Cross-tab Definition | SmartWare | SmartWare Corporation |
| .DGC | Shin-ichi Tsuruta | Arquivos de dados | DGCA File Archive | DGCA | Shin-ichi Tsuruta |
| .DGI | Buzzqw | Arquivos de dados | HDConvertToX Input Data | HDConvertToX | Buzzqw |
| .DGM | IBM | Arquivos de dados | IBM Lotus Freelance Graphics Diagram Data | Lotus Freelance Graphics | IBM |
| .DGO | Dell Technologies | Arquivos de dados | EqualLogic Diagnostic Log | Dell EqualLogic | Dell Technologies |
| .DGS | TES | Arquivos de dados | Dagesh Pro Document | TES Dagesh Pro | TES |
| .DGSCHEME-WEB | GipsyMedia Ltd | Arquivos de dados | DigiGuide TV Scheme | DigiGuide | GipsyMedia Ltd |
| .DGT | Interscape | Arquivos de dados | Digital Gallery File | Digital Gallery | Interscape |
| .DGX | IBM | Arquivos de dados | IBM Rational XDE Diagram | Rational XDE | IBM |
| .DH | Geoworks Ensemble | Arquivos de dados | Dependency Information File | Breadbox Ensemble | Breadbox Computer Company |
| .DHCD | DHCD Computing | Arquivos de dados | DHCD Computing Application Data File | DHCD Computing File Sniffer | DHCD Computing |
| .DHI | Unknown Developer | Arquivos de dados | DriverHound Index File | DriverHound | Unknown Developer |
| .DHR | Apple | Arquivos de dados | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .DHT | APTECH | Arquivos de dados | GAUSS Data Set Header File | Aptech GAUSS | Interscape |
| .DHY | Adobe Systems Incorporated | Arquivos de dados | Adobe Bridge Information File | Adobe Bridge CC | Adobe Systems Incorporated |
| .DICT | Microsoft Corporation | Arquivos de dados | Dictionary File | QuarkXPress | Quark Software Inc. |
| .DID | RICOH | Arquivos de dados | IKON DISC Image Document Identifier | IKON DISC image | RICOH |
| .DIF | Microsoft Corporation | Arquivos de dados | Data Interchange Format | Microsoft Excel | Microsoft Corporation |
| .DII | Ken Hamilton | Arquivos de dados | TypeSummation Batch Load File | CT Summation iBlaze or WebBlaze | Ken Hamilton |
| .DIL | Embarcadero Technologies | Arquivos de dados | Delphi File | Delphi (IDE) | Embarcadero Technologies |
| .DIP | Microsoft Corporation | Arquivos de dados | Windows Bitmap Format | Microsoft Windows | Microsoft Corporation |
| .DIST | Apple | Arquivos de dados | Mac OS X Distribution Script | MacroMates TextMate | MacroMates |
| .DISTZ | Apple | Arquivos de dados | Apple Mac OS X Installer Distribution File | Apple OS X | Apple |
| .DIX | Robert Hijmans | Arquivos de dados | DIVA-GIS Export File | DIVA-GIS | Robert Hijmans |
| .DJM | Dynojet Research | Arquivos de dados | Dynojet Map File | Dynoject Research Power Commander Control Center | Dynojet Research |
| .DKL | Oleksandr TR Roslov | Arquivos de dados | DupKiller File List | DupKiller | Oleksandr TR Roslov |
| .DKT | d-lusion interactive media | Arquivos de dados | DiGiTIAL THUNDER Drum Kit File | Drum Station | d-lusion interactive media |
| .DL0 | ABBYY | Arquivos de dados | Abbyy Finereader 4.0 Sprint Data | ABBYY FineReader | ABBYY |
| .DLC | JDownloader Team | Arquivos de dados | Download Link Container File | JDownloader | JDownloader Team |
| .DLD | Campbell Scientific | Arquivos de dados | EdLog Compiled Program | LoggerNet | Campbell Scientific |
| .DLG | Crytek | Arquivos de dados | Crysis Dialogue Data File | Crysis | Crytek |
| .DLI | Interscape | Arquivos de dados | Win32.Sober.AD@mm File | Win32.Sober.AD@mm | Interscape |
| .DLR | cebas Visual Technology | Arquivos de dados | FinalRender Plugin | cebas Visual Technology finalRender | cebas Visual Technology |
| .DLT | Alstom | Arquivos de dados | VCTEditor Data | VCTEditor | Alstom |
| .DLW | Dalim Software | Arquivos de dados | DALiM LiTHO Line Work Bitmap | DALiM LiTHO | Dalim Software |
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