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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .DAE | Sony | 3D Image Files | Digital Asset Exchange File | Apple Preview | Apple |
| .DART | Developer Files | Dart Source Code File | DiskImageMounter | Apple | |
| .DATA | Appricon | Data Files | Analysis Studio Offline Data | Apple OS X | Apple |
| .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) | Apple IIGS | Apple |
| .DAYS | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .DB | Dwayne Richard Hipp | Database Files | Mobile Device Database File | Apple iOS | Apple |
| .DB-JOURNAL | Sublime HQ Pty Ltd | Database Files | SQLite Rollback Journal File | Apple TextEdit | Apple |
| .DBM | Adobe Systems Incorporated | Web Files | ColdFusion Server File | Apple Safari | Apple |
| .DBP | Microsoft Corporation | Developer Files | Microsoft Visual Studio Visual C++ Database Project | Apple TextEdit | Apple |
| .DEBUG | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .DEC | Various Developers | Developer Files | Declaration File | Apple TextEdit | Apple |
| .DEFAULT | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .DEL | Apple | Data Files | Apple Safari | Apple Safari | Apple |
| .DER | Mozilla | Web Files | DER Certificate File | Apple Safari | Apple |
| .DFONT | Open Source | Font Files | Mac OS X Data Fork Font | Font Book | Apple |
| .DFU | Apple | System Files | iOS DFU File | Apple iOS | Apple |
| .DGT | Interscape | Data Files | Digital Gallery File | Apple Preview | Apple |
| .DHR | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .DIF | Microsoft Corporation | Data Files | Data Interchange Format | Apple QuickTime Player | Apple |
| .DISTZ | Apple | Data Files | Apple Mac OS X Installer Distribution File | Apple OS X | Apple |
| .DIZ | Unknown Developer | Text Files | Description In Zip File | Apple TextEdit | Apple |
| .DMG | Apple | Disk Image Files | Mac OS X Disk Image File | Mac OS X Finder | Apple |
| .DML | Sybase, Inc | Web Files | DynaScript File | Apple Safari | Apple |
| .DNG | Adobe Systems Incorporated | Camera Raw Files | Digital Negative Image File | Apple Photos | Apple |
| .DNP | Apple | Settings Files | DRM Digital Rights Management Data | Apple QuickTime Player | Apple |
| .DO | Unknown Developer | Web Files | Java Servlet | Safari | Apple |
| .DOC | Microsoft Corporation | Text Files | Microsoft Word Document (before The 2007 Version) | iWork | Apple |
| .DOCX | Microsoft Corporation | Text Files | Microsoft Word Open XML Document | Apple Pages | Apple |
| .DOK | Nenad Hrg | Settings Files | DesktopOK Icons Layout File | Apple TextEdit | Apple |
| .DOTX | Microsoft Corporation | Page Layout Files | Word 2007 XML Template | Apple Preview | Apple |
| .DOWN | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .DPX | Kodak | Raster Image Files | Digital Picture Exchange File | Apple Final Cut Pro | Apple |
| .DRAFT | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .DRIVE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .DRIVERS | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .DRW | Corel | Vector Image Files | DESIGNER Drawing | Apple AppleWorks | Apple |
| .DSC | Kingsoft | Settings Files | Kingsoft Design Science Equation File | Apple TextEdit | Apple |
| .DSK | Power Software Ltd | Disk Image Files | General Disk Image | Apple Disk Utility | Apple |
| .DSN | Cadence Design Systems | CAD Files | OrCAD Design File | Apple ODBC Administrator | Apple |
| .DS_STORE | Apple | Settings Files | Mac OS X Folder Settings File | Mac OS X Finder | Apple |
| .DTD | Syncro Soft | Developer Files | Document Type Definition File | Apple TextEdit | Apple |
| .DTS | CyberLink | Audio Files | DTS Encoded Audio File | Apple iTunes | Apple |
| .DUMP | Microsoft Corporation | System Files | Dump File | macOS | Apple |
| .DV | Roxio | Video Files | Digital Video File | Apple QuickTime Player | Apple |
| .DVDPROJ | Apple | Data Files | iDVD Project File | Apple iDVD | Apple |
| .DVL | Dalim Software | Raster Image Files | Virtual Library File | Dalim Virtual Library | Apple |
| .DVX | DivX, LLC. | Video Files | DivX Video File | Apple QuickTime Player | Apple |
| .DYLIB | Apple | Developer Files | Mach-O Dynamic Library | Apple Xcode | Apple |
| .DYNAMO | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
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