List of Extensions starting with the letter D
| File Extension | Description |
| .DAT | Generic Data Video CD MPEG movie MPEG1 Act of War game Antivitus Data AVG, Bitdefender AOL Messenger (AIM) BFTS database Apple Safari dictionary Clarion DOS database Corel WordPerfect merge LabVIEW binary datalog LEGO Star Wars game archive MapInfo native format Microsoft Internet Explorer cache Microsoft Word for DOS data Mozilla Firefox plug-in register Nero BackItUp drive image Skype local store Sony Digital Audio Tape SPOT graphic SPOT image format TomTom traffic data Yahoo! Instant Messenger settings |
| .DATA | Adobe Soundbooth Analysis Studio offline Apple iPhoto thumb segment Arena Wars game archive CoreFSIF database Generally SAM Sid Tune |
| .DB | Generally database ANSYS database Apple Safari cache database ArcView object Atari Jaguar debugger script Corel Paradox Smartware XTreeGold dBASE IV/dBFast configuration DIGIBooster module Microsoft Windows thumbnail database file format Mozilla (Netscape) client certificate Netscape security module Novell GroupWise address book S.T.A.L.K.E.R. X-Ray engine SmartWare Office pac SQL Anywhere Synopsys Design Compiler |
| .DBF | Common database AbacusLaw ACDSee thumbnail cache Act! Main Alpha Five table ArcView Shapefile attribute table FLAMES Recorder output JetForm FormFlow Nova Logic game dialog binary Oracle 8.x tablespace Palm Zire photo Psion Series 3 Visual FoxPro |
| .DJVU | DjVu image |
| .DLL | Dinamic Link Library |
| .DMG | Apple Mac OS X disk image Oracle binary format dump |
| .DO | 4oD Player playlist Apache Struts Digital Line Graph optional vector data ModelSim script |
| .DOC | Microsoft Word document |
| .DOCX | Microsoft Word extended document |
| .DOWNLOAD | Download |
| .DWG | AutoCAD Drawing BravoDRAFT Detailer |