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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .D01 | Yamaha Corporation | Audio Files | OPL2 FM Audio File | Winamp with Ganbatte! Plug-in | Unknown Developer |
| .DAB | Epigon Media Technologies | Audio Files | Digital Audio Broadcasting Audio Data | DMB Player | Epigon Media Technologies |
| .DAW | Hasbro | Audio Files | Hasbro Scrabble CDROM OWL2 List File | Hasbro Scrabble CD-ROM | Hasbro |
| .DB | Dwayne Richard Hipp | Audio Files | Mobile Device Database File | SQLite | Dwayne Richard Hipp |
| .DCF | Sony Mobile Communications | Audio Files | DRM Content Format File | DRM Packager | Sony Mobile Communications |
| .DCM | National Electrical Manufacturers Association (NEMA) | Audio Files | DICOM Image File Format | Adobe Photoshop | Adobe Systems Incorporated |
| .DCT | Microsoft Corporation | Audio Files | Dictionary File | QuarkXPress | Quark Software Inc. |
| .DDA | MicroImages | Audio Files | TNTmips Import File Format | TNTmips | MicroImages |
| .DDT | Sports Interactive | Audio Files | Football Manager Keep Player Data File | Football Manager 2016 | Sports Interactive |
| .DEWF | Macromedia | Audio Files | SoundEdit Recorded Instrument | Awave Studio | FMJ-Software |
| .DF2 | Jenner Fusari | Audio Files | Defractor 2 Instrument | Neurotix Defractor | Jenner Fusari |
| .DFC | Jenner Fusari | Audio Files | Defractor Instrument | Neurotix Defractor | Jenner Fusari |
| .DFF | Zanoza Software | Audio Files | RenderWare Model File | Zanoza ZModeler | Zanoza Software |
| .DFM | Open Source | Audio Files | Pascal File | Notepad++ | Don Ho |
| .DFU | Apple | Audio Files | iOS DFU File | Apple iOS | Apple |
| .DHP | Media Cybernetics | Audio Files | Dr. Halo II-III Bitmap File | Dr. Halo III paint program | Media Cybernetics |
| .DIG | Various Developers | Audio Files | Sound Designer Audio File | Awave Studio | FMJ-Software |
| .DJE | Unknown Developer | Audio Files | MattBatt iAM-player Track List | Unknown Software | Unknown Developer |
| .DJR | Avanquest Software | Audio Files | Ringtone Media Studio DJ Ringtone Project | Avanquest Ringtone Media Suite | Avanquest Software |
| .DKD | Interscape | Audio Files | Karaoke Music File | JBK Karaoke Player | Interscape |
| .DLP | Microsoft Corporation | Audio Files | DirectMusic Producer DLS Data | DirectMusic Producer | Neowin |
| .DLS | Not a Hat / Pete Yandell | Audio Files | Downloadable Sounds File | SimpleSynth | Not a Hat / Pete Yandell |
| .DMC | nModal Solutions Inc. | Audio Files | Datamartist Data Canvas File | nModal Solutions Datamartist | nModal Solutions Inc. |
| .DMF | Geosystem | Audio Files | Geosystem Digitals Map File | Geosystem Digitals | Geosystem |
| .DRA | Nuance | Audio Files | Dragon NaturallySpeaking Voice | Dragon NaturallySpeaking | Nuance |
| .DRO | Open Source | Audio Files | DOSBox Raw OPL Format | DOSBox | Open Source |
| .DRX | Adobe Systems Incorporated | Audio Files | Adobe Photoshop Tutorial Data | Adobe Photoshop | Adobe Systems Incorporated |
| .DS | DAZ 3D | Audio Files | DAZ Studio 1/2 Script | DAZ Studio | DAZ 3D |
| .DSF | DAZ 3D | Audio Files | DAZ Studio Asset File | DAZ Studio | DAZ 3D |
| .DSM | Open Source | Audio Files | Digital Sound Module | ModPlug Player | Open Source |
| .DSP | Open Source | Audio Files | Dynamic Studio Professional Module | ModPlug Player | Open Source |
| .DSS | The International Voice Association (IVA) | Audio Files | Digital Speech Standard File | DSS Player Lite | Olympus Corporation |
| .DTG | Desktop Music | Audio Files | Desktop Guitar Score File | Desktop Guitar | Desktop Music |
| .DTM | Prodatron | Audio Files | DigiTrakker Audio Module | CocoModX | Open Source |
| .DTS | CyberLink | Audio Files | DTS Encoded Audio File | CyberLink PowerDVD | CyberLink |
| .DTSHD | Digital Theater Systems (DTS) Inc. | Audio Files | DTS-HD Master Audio File | DTS-HD MASTER AUDIO SUITE | Digital Theater Systems (DTS) Inc. |
| .DUB | Interscape | Audio Files | Tuningwrench Audio Utility Compressed Audio | Tuningwrench | Interscape |
| .DVA | Leitch Technology | Audio Files | DPS Velocity Split Audio | DPS Velocity | Leitch Technology |
| .DVC | IBM | Audio Files | Lotus 1-2-3 Data | Lotus 1-2-3 | IBM |
| .DVF | Sony | Audio Files | Sony Digital Voice File | Microsoft Windows Media Player | Microsoft Corporation |
| .DVW | Dektron | Audio Files | Dektron Digital Voice Recorder Audio Data | Dektron Digital Voice Recorder | Dektron |
| .DW | Un4seen Developments | Audio Files | David Whittaker Audio File | DeliPlayer | Open Source |
| .DWA | Alex Gavrilov | Audio Files | Digital Waveform Archiver Audio File | DWA Coder | DWA Coder |
| .DWD | DiamondWare Ltd. | Audio Files | DiamondWare Digital Audio File | Wi-Fone | DiamondWare Ltd. |
| .D_ | Unknown Developer | Audio Files | Seqmax Seqprest Compressed Audio File | Unknown Software | Unknown Developer |
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