| .DAH | Indigo Rose | Raster Image Files | AutoPlay Media Studio Splash Image | AutoPlay Media Studio | Indigo Rose |
| .DAT | Unknown Developer | Raster Image Files | Game Data | Dragon UnPACKer | Open Source |
| .DC2 | Kodak | Raster Image Files | Kodak Digital Camera RAW Image File | Adobe Photoshop | Adobe Systems Incorporated |
| .DCM | National Electrical Manufacturers Association (NEMA) | Raster Image Files | DICOM Image File Format | Adobe Photoshop | Adobe Systems Incorporated |
| .DCX | ZSoft Corporation | Raster Image Files | Zsoft Multi-Page Paintbrush File | Adobe Photoshop | Adobe Systems Incorporated |
| .DDB | Avid Technology | Raster Image Files | Digidesign Database | Avid Pro Tools | Avid Technology |
| .DDS | Microsoft Corporation | Raster Image Files | DirectDraw Surface | Adobe Photoshop | Adobe Systems Incorporated |
| .DDT | Sports Interactive | Raster Image Files | Football Manager Keep Player Data File | Football Manager 2016 | Sports Interactive |
| .DGC | Shin-ichi Tsuruta | Raster Image Files | DGCA File Archive | DGCA | Shin-ichi Tsuruta |
| .DGT | Interscape | Raster Image Files | Digital Gallery File | Digital Gallery | Interscape |
| .DIB | The GIMP Development Team | Raster Image Files | Device Independent Bitmap File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .DIC | National Electrical Manufacturers Association (NEMA) | Raster Image Files | DICOM Image File | GIMP | The GIMP Development Team |
| .DICOM | National Electrical Manufacturers Association (NEMA) | Raster Image Files | DICOM Image File | GIMP | The GIMP Development Team |
| .DJV | LizardTech | Raster Image Files | DjVu Compressed Image Format | Canvas X | ACD Systems |
| .DJVU | LizardTech | Raster Image Files | DjVu Image | ACD Systems ACDSee | ACD Systems |
| .DM3 | Gatan | Raster Image Files | DigitalMicrograph Image | ImageJ | National Institutes of Health (NIH) |
| .DMI | BYOND | Raster Image Files | BYOND Dream Maker Icon File | BYOND | BYOND |
| .DOL | Nintendo | Raster Image Files | GameCube Executable File | Dolphin (emulator) | Dolphin Emulator Project |
| .DOO | Atari Corporation | Raster Image Files | Atari Doodle Image | Unknown Software | Unknown Developer |
| .DPX | Kodak | Raster Image Files | Digital Picture Exchange File | Adobe SpeedGrade | Adobe Systems Incorporated |
| .DRL | Gerber Technology | Raster Image Files | Gerber Drill Rack File | Altium Designer | Altium |
| .DRZ | Unknown Developer | Raster Image Files | Draz Paint File | XnView MP | XnSoft |
| .DT2 | Microsoft Corporation | Raster Image Files | Windows Live Messenger Emoticon Image File | Microsoft Windows Live Messenger | Microsoft Corporation |
| .DTW | Netzwelt | Raster Image Files | Desktop Wallpaper | My Better Desktop Full Suite | Netzwelt |
| .DVL | Dalim Software | Raster Image Files | Virtual Library File | Dalim Virtual Library | Apple |
| .DZI | Microsoft Corporation | Raster Image Files | PhotoSynth Deep Zoom Image File | Microsoft PhotoSynth | Microsoft Corporation |
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