Alphabetically: D
Extension File Description File Type
.d
D Source Code File
Developer
.d00
OPL2 FM Audio File
Audio
.d01
OPL2 FM Audio File
Audio
.d2v
DVD2AVI File
Video
.d3d
Game Maker 3D File
3D Image
.d3v
Datel Video File
Video
.d64
Commodore 64 Disk Image
Disk Image
.d88
Toshiba Pasopia 7 Disk File
Disk Image
.da0
Windows Registry Backup File
Backup
.da2
DeepAnalysis Save File
Data
.daa
PowerISO Direct-Access-Archive
Disk Image
.dae
Digital Asset Exchange File
3D Image
.daf
Digital Anchor File
Data
.dal
Download Accelerator Plus URL List
Misc
.dam
DeltaMaster Analysis Model
Data
.dao
Disk at Once CD/DVD Image
Disk Image
.dap
Access Data Access Page
Web
.dar
DAR Disk Archive
Compressed
.das
DeltaMaster Analysis Session
Data
.dat
Data File
Data
.data
Analysis Studio Offline Data File
Data
.dav
DVR365 Video File
Video
.dax
PSP Compressed ISO Disc Image
Disk Image
.dazip
Dragon Age: Origins Game File
Game
.db
Database File
Database
.db2
dBASE II Database
Database
.db3
SQLite Database File
Database
.dba
Palm Datebook Backup File
Backup
.dbb
Skype User Information File
Settings
.dbc
FoxPro Database
Database
.dbd
DemoShield Project
Data
.dbf
Database File
Database
.dbg
FoxPro Debugger Configuration
Settings
.dbk
Sony Ericsson Mobile Phone Backup File
Backup
.dbm
ColdFusion Server File
Web
.dbml
Visual Studio OR Design File
Developer
.dbo
DarkBASIC Object
Developer
.dbproj
Visual Studio Database Project File
Developer
.dbt
Database Text File
Database
.dbv
Database Variable Field
Database
.dbx
Outlook Express E-mail Folder
Misc
.dc
DesignCAD Design File
CAD
.dc1
Bloomba E-mail Message
Misc
.dc2
DesignCAD 2D ASCII Drawing
CAD
.dc3
DesignCAD 3D ASCII Drawing
CAD
.dc4
ViaThinkSoft (De)Coder 4 File
Encoded
.dcd
DesignCAD Drawing
CAD
.dce
DriveCam Video
Video
.dcf
DRM Content Format File
Audio
.dck
Resolume Deck File
Video
.dcl
AutoCAD Dialog Definition File
Settings
.dcm
DICOM Image File
Raster Image
.dcmd
DiskCatalogMaker Thumbnail-Enabled Catalog
Data
.dco
DisCryptor Encrypted Virtual Disk Archive
Encoded
.dcover
Disc Cover File
Misc
.dcp
Adobe DNG Camera Profile
Settings
.dcpf
Disc Copier Project File
Data
.dcpr
Adobe DNG Camera Profile Recipe File
Data
.dcr
Kodak RAW Image File
Raster Image
.dcs
Desktop Color Separation File
Vector Image
.dcst
Adobe InDesign Document Presets File
Settings
.dct
FoxPro Database Memo
Database
.dctmp
DC++ Partially Downloaded File
Misc
.dcu
Delphi Compiled Unit
Developer
.dcx
FoxPro Database Index
Database
.dd
DiskDouber Archive
Compressed
.ddat
DivX Temporary Video File
Video
.ddb
Device Dependent Bitmap
Raster Image
.ddc
DivX Descriptor File
Data
.ddcx
DivX Descriptor 2 File
Data
.ddf
Diamond Directive File
Settings
.ddrw
ClarisDraw Drawing
Vector Image
.dds
DirectDraw Surface
Raster Image
.ddt
Football Manager Keep Player Data File
Game
.deb
Debian Software Package
Compressed
.dec
Declaration File
Developer
.ded
Dr. Engrave Document
Vector Image
.def
Module-Definition File
Developer
.dek
Memorize-It Flashcard Deck
Misc
.dem
Video Game Demo
Game
.des
Pro/DESKTOP CAD File
CAD
.design
Microsoft Expression Design Drawing
Vector Image
.desklink
Desktop Shortcut
System
.desktop
Desktop Entry File
Misc
.dev
Windows Device Driver File
System
.dewf
SoundEdit Recorded Instrument
Audio
.dex
DEXIS Digital X-ray File
Data
.df1
Omnis Native Datafile
Developer
.df2
Defractor 2 Instrument
Audio
.dfc
Defractor Instrument
Audio
.dff
RenderWare Model File
3D Image
.dfm
Delphi Form
Developer
.dfont
Mac OS X Data Fork Font
Font
.dfp
Fusion Plugin File
Plugin
.dfproj
DVD Flick Project
Data
.dft
Solid Edge Draft Document
CAD
.dfx
Drafix CAD File
CAD
.dgb
FlashCAD Drawing Database
CAD
.dgc
TurboTax Tax Form
Misc
.dgk
Delcam 3D Model File
CAD
.dgn
MicroStation Design File
CAD
.dgs
Dagesh Pro Document
Text
.dhtml
Dynamic HTML file
Web
.diagcab
Troubleshooting Pack Cabinet File
System
.diagcfg
Troubleshooting Pack Configuration File
System
.diagpkg
Troubleshooting Pack File
System
.dib
Device Independent Bitmap File
Raster Image
.dic
Dictionary File
Misc
.dicproof
Microsoft Dictionary Proofing File
Settings
.dif
Data Interchange Format
Data
.dig
Digilink Audio File
Audio
.dii
Summation Batch Load File
Data
.dim
DIME File
Encoded
.dime
Direct Internet Message Encapsulation File
Encoded
.dinfo
DivX Temporary Video Info File
Settings
.dir
Adobe Director Movie
Video
.directory
KDE Folder View Properties File
Settings
.disco
DISCO Discovery Document
Web
.discomap
DISCO Discovery Output File
Web
.disk
Linux Virtual Hard Disk
Disk Image
.diskdefines
Linux LiveCD Information File
Misc
.dist
Mac OS X Distribution Script
Compressed
.div
DIVA-GIS Project File
GIS
.divx
DivX-Encoded Movie File
Video
.dix
DIVA-GIS Export File
GIS
.diz
Description in Zip File
Text
.djm
Dynojet Map File
Data
.djv
DjVu Image
Raster Image
.djvu
DjVu Image
Raster Image
.dke
DriveLock FDE Disk Key File
Misc
.dl
Zoo Tycoon 2 Data File
Game
.dlc
Download Link Container File
Encoded
.dld
EdLog Compiled Program
Executable
.dlg
Digital Line Graph
GIS
.dll
Dynamic Link Library
System
.dlm
Akamai Download Manager File
Misc
.dlo
3ds Max Plug-in
Plugin
.dls
Downloadable Sounds File
Audio
.dlu
3ds Max Utility Plug-in File
Plugin
.dlv
CATIA 4 Export File
CAD
.dlx
Sony VDU Video File
Video
.dm
DRM Delivery Message
Audio
.dm2
Toad Data Modeler 2 File
Data
.dmb
Digital Multimedia Broadcasting File
Video
.dmc
Datamartist Data Canvas File
Data
.dmf
Delusion Digital Music File
Audio
.dmg
Mac OS X Disk Image
Disk Image
.dmgpart
Mac OS X Disk Image Part
Disk Image
.dml
DynaScript File
Web
.dmo
Duke Nukem 3D Demo File
Game
.dmp
Windows Memory Dump
System
.dms
Disk Masher Image
Disk Image
.dmsa
Music Disc Creator Project File
Audio
.dmse
Sound Editor Project File
Audio
.dmsk
DivX Temporary Video Data File
Data
.dmsm
VideoWave Movie Project File
Video
.dmsm3d
VideoWave 3D Movie Project File
Video
.dmsp
PhotoSuite Project File
Data
.dmss
VideoWave SlideShow Project File
Video
.dm_82
Wolfenstein 1.00 Demo Movie File
Game
.dm_83
Wolfenstein 1.02 Demo Movie File
Game
.dm_84
Wolfenstein 2.06 Demo Movie File
Game
.dna
CA Backup and Migration Backup File
Backup
.dnc
Windows Dancer File
Video
.dne
Netica Text File
Text
.dng
Digital Negative Image File
Raster Image
.dnl
DNAML eBook File
Misc
.do
Java Servlet
Web
.dob
Visual Basic UserDocument
Developer
.doc
Microsoft Word Document
Text
.dochtml
Microsoft Word HTML Document
Web
.dockzip
ObjectDock File
Data
.docm
Word Open XML Macro-Enabled Document
Text
.docmhtml
Microsoft Word MIME HTML Document
Web
.docx
Microsoft Word Open XML Document
Text
.dol
Gamecube Executable File
Game
.dolphinview
Dolphin Folder View Settings File
Settings
.dot
Word Document Template
Layout
.dothtml
Microsoft Word HTML Document Template
Web
.dotm
Word Open XML Macro-Enabled Document Template
Text
.dotx
Word Open XML Document Template
Text
.dov
Temp File
Backup
.download
Partially Downloaded File
Web
.downloadhost
MSN Download Settings File
Settings
.dox
Visual Basic Binary UserDocument
Developer
.dp1
DataPower Database File
Database
.dpb
FaxMaster Document
Misc
.dpd
Ovation Pro File
Layout
.dpg
Nintendo DS Movie File
Video
.dpk
Delphi Package
Developer
.dpl
Delphi Package Library
Developer
.dpm
Pro Tools Plugin File
Plugin
.dpn
Depiction Data File
Data
.dpp
Serif DrawPlus Drawing File
Vector Image
.dpr
Delphi Project
Developer
.dps
DivX Player 2 Skin File
Settings
.dpx
Digital Picture Exchange File
Raster Image
.dqy
Excel Query File
Database
.dr
DRM Rights Object
Misc
.drc
DRM Rights Object
Misc
.dream
Dream Animated Wallpaper File
Video
.drg
I-Doser Audio Drug File
Audio
.drl
Gerber Drill Rack File
Data
.drm
Cubase Drum Map File
Settings
.drv
Device Driver
System
.drw
Drawing File
Vector Image
.drwdot
SolidWorks Drawing Template
CAD
.ds
LMMS DrumSynth File
Audio
.dsb
Orchida Embroidery File
Data
.dsc
CoolPix Disk Identification File
Misc
.dsd
AutoCAD Drawing Set Description File
Settings
.dsf
Delusion Digital Sound File
Audio
.dsg
Control Studio Document
CAD
.dsk
Disk Image
Disk Image
.dskin
DockX Skin
Misc
.dsm
Digital Sound Module
Audio
.dsn
Database Source Name File
Database
.dsp
Visual C++ 6 Project
Developer
.dss
Digital Speech Standard File
Audio
.dst
AutoCAD Sheet Set File
CAD
.dstudio
DownloadStudio Incomplete Download
Misc
.dsv
DeSmuME Save File
Text
.dsw
Visual C++ 6 Workspace File
Settings
.dsx
Diet Studio XML File
Data
.dsy
Directory Synchronizer Project File
Data
.dsym
Xcode Debug Symbols File
Developer
.dsz
Orchida (OES) Embroidery File
Data
.ds_store
Mac OS X Folder Settings File
Settings
.dt0
DTED Level 0 File
GIS
.dt1
DTED Level 1 File
GIS
.dt2
Windows Live Messenger Emoticon Image File
Raster Image
.dta
Chain Engineering Database
Data
.dtd
Document Type Definition File
Developer
.dtf
Domino Temporary File
Misc
.dtm
DigiTrakker Module
Audio
.dtp
Publish-iT Document
Layout
.dtr
DATroniC Data Recording
Data
.dts
DTS Encoded Audio File
Audio
.dtshd
DTS-HD Master Audio File
Audio
.dtw
Desktop Wallpaper
Raster Image
.dt_
Macintosh Data Fork
Misc
.dus
Readiris Font Dictionary
Misc
.dv
Digital Video File
Video
.dv-avi
Microsoft DV-AVI Video File
Video
.dv2
Divinity 2 Data File
Game
.dv4
Bosch Security Systems CCTV Video File
Video
.dvd
DOS Device Driver
System
.dvdmedia
RipIt DVD Package
Video
.dvdproj
iDVD Project File
Data
.dvds
DVDStyler Project File
Data
.dvf
Sony Digital Voice File
Audio
.dvi
Device Independent Format File
Text
.dvl
Virtual Library File
Raster Image
.dvo
Cook'n Cookbook File
Data
.dvr-ms
Microsoft Digital Video Recording
Video
.dvx
DivX Video File
Video
.dwc
Emulex DWC Firmware Update File
Misc
.dwd
DiamondWare Digital Audio File
Audio
.dwf
Design Web Format File
3D Image
.dwfx
Design Web Format XPS File
CAD
.dwg
AutoCAD Drawing Database File
CAD
.dwi
Dance With Intensity Song File
Data
.dwl
TurboCAD Drawing Lock File
Misc
.dwlibrary
Paperless Document Library
Misc
.dwn
Firmware Update File
Misc
.dwp
DarkWave Studio Project File
Data
.dws
AutoCAD Drawing Standards File
CAD
.dwt
Dreamweaver Web Page Template
Web
.dwz
DVD MovieFactory Project File
Data
.dx
DEC WPS Plus File
Text
.dxb
Drawing Exchange Binary
Vector Image
.dxe
AutoCAD Data Extraction Template
CAD
.dxf
Drawing Exchange Format File
CAD
.dxp
CDBurnerXP Data Disc Compilation File
Settings
.dxr
Protected Macromedia Director Movie
Video
.dxs
Deus Ex Saved Game
Game
.dxx
AutoCAD Drawing Interchange Attribute File
CAD
.dyc
Xerox Printer Driver Configuration File
System
.dylib
Mach-O Dynamic Library
Developer
.dzm
DirectorZone Menu Template
Video
.dzp
DirectorZone Particle Effect File
Video
.dzt
DirectorZone Title File
Video