| Extension |
File Type |
File Description |
| .d | Developer | D Source Code File |
| .d00 | Audio | OPL2 FM Audio File |
| .d01 | Audio | OPL2 FM Audio File |
| .d2v | Video | DVD2AVI File |
| .d3v | Video | Datel Video File |
| .d64 | Disk | Commodore 64 Disk Image |
| .d88 | Disk | Toshiba Pasopia 7 Disk File |
| .da0 | Backup | Windows Registry Backup File |
| .daa | Disk | PowerISO Direct-Access-Archive |
| .dae | Image | Digital Asset Exchange File |
| .daf | Data | Digital Anchor File |
| .dal | Misc | Download Accelerator Plus URL List (Most common) |
| .dam | Data | DeltaMaster Analysis Model |
| .dao | Disk | Disk at Once CD/DVD Image |
| .dap | Web | Access Data Access Page (Most common) |
| .dap | Web | Access Data Access Page (Most common) |
| .dar | Compressed | DAR Disk Archive |
| .das | Data | DeltaMaster Analysis Session |
| .dat | Data | Data File (Most common) |
| .dax | Disk | PSP Compressed ISO Disc Image |
| .db | Data | Database File <font color="#00AA33">(Most common)</font> |
| .db | Data | Database File (Most common) |
| .db2 | Data | dBASE II Database |
| .dbb | Settings | Skype User Information File |
| .dbc | Data | FoxPro Database |
| .dbd | Data | DemoShield Project |
| .dbf | Data | Database File (Most common) |
| .dbg | Settings | FoxPro Debugger Configuration |
| .dbk | Backup | dBASE Database Backup |
| .dbm | Web | ColdFusion Server File |
| .dbt | Text | Database Text File |
| .dbv | Misc | Database Variable Field |
| .dbx | Misc | Outlook Express E-mail Folder (Most common) |
| .dc | Image | DesignCAD Design File |
| .dc1 | Misc | Bloomba E-mail Message |
| .dc4 | Encoded | ViaThinkSoft (De)Coder 4 File |
| .dcd | Image | DesignCAD Drawing (Most common) |
| .dce | Video | DriveCam Video |
| .dcf | Data | Document Computation Format (Most common) |
| .dcl | Data | DumpSec Report File |
| .dcm | Image | DICOM Image File (Most common) |
| .dcmd | Data | DiskCatalogMaker Thumbnail-Enabled Catalog |
| .dco | Encoded | DisCryptor Encrypted Virtual Disk Archive |
| .dcp | Developer | Delphi Compiled Package |
| .dcr | Raster Image | Kodak RAW Image File (Most common) |
| .dcs | Vector Image | Desktop Color Separation File |
| .dct | Text | FoxPro Database Memo (Most common) |
| .dctmp | Misc | DC++ Partially Downloaded File |
| .dcu | Developer | Delphi Compiled Unit |
| .dcx | Misc | FoxPro Database Index (Most common) |
| .dd | Compressed | DiskDouber Archive |
| .ddb | Raster Image | Device Dependent Bitmap |
| .ddc | Data | DivX Descriptor File |
| .ddcx | Data | DivX Descriptor 2 File |
| .ddrw | Image | ClarisDraw Drawing |
| .dds | Raster Image | DirectDraw Surface |
| .deb | Compressed | Debian Software Package |
| .dec | Developer | Declaration File |
| .def | Developer | Module-Definition File (Most common) |
| .dek | Misc | Memorize-It Flashcard Deck (Most common) |
| .dem | Game | Video Game Demo (Most common) |
| .dem | Game | Video Game Demo (Most common) |
| .des | Image | Pro/DESKTOP CAD File (Most common) |
| .design | Vector Image | Microsoft Expression Design Drawing |
| .desklink | System | Desktop Shortcut |
| .desktop | Misc | Desktop Entry File |
| .dev | System | Windows Device Driver File (Most common) |
| .dewf | Audio | SoundEdit Recorded Instrument |
| .dex | Data | DEXIS Digital X-ray File (Most common) |
| .df1 | Developer | Omnis Native Datafile |
| .df2 | Audio | Defractor 2 Instrument |
| .dfc | Audio | Defractor Instrument |
| .dff | Image | RenderWare Model File |
| .dfm | Developer | Delphi Form (Most common) |
| .dfont | Font | Mac OS X Data Fork Font |
| .dfp | Plugin | Fusion Plugin File |
| .dfproj | Data | DVD Flick Project |
| .dft | Data | Solid Edge Draft Document |
| .dfx | Image | Drafix CAD File |
| .dgb | Data | FlashCAD Drawing Database |
| .dgc | Misc | TurboTax Tax Form (Most common) |
| .dgn | Vector Image | MicroStation Design File |
| .dgs | Text | Dagesh Pro Document |
| .dhtml | Web | Dynamic HTML file |
| .dib | Raster Image | Device Independent Bitmap File |
| .dic | Misc | Dictionary File |
| .dif | Data | Data Interchange Format (Most common) |
| .dig | Audio | Digilink Audio File (Most common) |
| .dii | Data | Summation Batch Load File |
| .dim | Encoded | DIME File |
| .dime | Encoded | Direct Internet Message Encapsulation File |
| .dir | Video | Adobe Director Movie |
| .directory | Settings | KDE Folder View Properties File |
| .disco | Web | DISCO Discovery Document |
| .discomap | Web | DISCO Discovery Output File |
| .disk | Disk | Linux Virtual Hard Disk |
| .diskdefines | Misc | Linux LiveCD Information File |
| .dist | Compressed | Mac OS X Distribution Script |
| .divx | Video | DivX-Encoded Movie File |
| .diz | Text | Description in Zip File |
| .djvu | Raster Image | DjVu Image |
| .dlc | Encoded | Download Link Container File |
| .dld | Executable | EdLog Compiled Program |
| .dlg | Data | Digital Line Graph |
| .dll | Data | Dynamic Link Library (Most common) |
| .dlm | Misc | Akamai Download Manager File |
| .dlo | Plugin | 3ds Max Plug-in |
| .dls | Audio | Downloadable Sounds File |
| .dm | Audio | DRM Delivery Message |
| .dm_82 | Game | Wolfenstein 1.00 Demo Movie File |
| .dm_83 | Game | Wolfenstein 1.02 Demo Movie File |
| .dm_84 | Game | Wolfenstein 2.06 Demo Movie File |
| .dm2 | Data | Toad Data Modeler 2 File (Most common) |
| .dmb | Video | Digital Multimedia Broadcasting File |
| .dmc | Executable | Medical Manager Script |
| .dmf | Audio | Delusion Digital Music File |
| .dmg | Disk | Mac OS X Disk Image |
| .dmo | Data | Derive Demo (Most common) |
| .dmp | System | Windows Memory Dump |
| .dms | Disk | Disk Masher Image (Most common) |
| .dne | Text | Netica Text File |
| .dng | Raster Image | Digital Negative Image File |
| .do | Web | Java Servlet |
| .dob | Developer | Visual Basic UserDocument |
| .doc | Text | Microsoft Word Document (Most common) |
| .dockzip | Data | ObjectDock File |
| .docm | Text | Word 2007 Macro-Enabled Document |
| .docx | Text | Microsoft Word Open XML Document |
| .dol | Game | Gamecube Executable File |
| .dolphinview | Settings | Dolphin Folder View Settings File |
| .dot | Text | Microsoft Word Template |
| .dotm | Text | Word 2007 Macro-Enabled Document Template |
| .dotx | Text | Word 2007 Document Template |
| .dov | Backup | Temp File |
| .download | Web | Partially Downloaded File |
| .downloadhost | Settings | MSN Download Settings File |
| .dox | Developer | Visual Basic Binary UserDocument |
| .dp1 | Data | DataPower Database File |
| .dpb | Misc | FaxMaster Document |
| .dpd | Page Layout | Ovation Pro File |
| .dpg | Video | Nintendo DS Movie File |
| .dpk | Developer | Delphi Package |
| .dpl | Developer | Delphi Package Library |
| .dpm | Plugin | Pro Tools Plugin File |
| .dpn | Data | Depiction Data File |
| .dpp | Vector Image | DrawPlus Drawing File |
| .dpr | Developer | Delphi Project (Most common) |
| .dpx | Raster Image | Digital Picture Exchange File |
| .dqy | Misc | Excel Query File |
| .dr | Misc | DRM Rights Object |
| .drc | Misc | DRM Rights Object |
| .drl | Data | Gerber Drill Rack File |
| .drm | Settings | Cubase Drum Map File |
| .drv | System | Device Driver |
| .drw | Vector Image | Drawing File (Most common) |
| .drwdot | Vector Image | SolidWorks Drawing Template |
| .ds | Executable | TWAIN Data Source |
| .ds_store | Settings | Mac OS X Folder Settings File |
| .dsb | Data | Orchida Embroidery File |
| .dsc | Misc | CoolPix Disk Identification File |
| .dsf | Audio | Delusion Digital Sound File |
| .dsk | Disk | Disk Image (Most common) |
| .dsm | Audio | Digital Sound Module |
| .dsp | Developer | Developer Studio Project (Most common) |
| .dss | Audio | Digital Speech Standard File (Most common) |
| .dst | Misc | Embroidery Format |
| .dstudio | Misc | DownloadStudio Incomplete Download |
| .dsw | Settings | Visual C++ Workspace File |
| .dsy | Data | Directory Synchronizer Project File (Most common) |
| .dsym | Developer | Xcode Debug Symbols File |
| .dsz | Data | Orchida (OES) Embroidery File |
| .dt_ | Misc | Macintosh Data Fork |
| .dtd | Developer | Document Type Definition |
| .dtm | Audio | DigiTrakker Module |
| .dtp | Page Layout | Publish-iT Document |
| .dtr | Data | DATroniC Data Recording |
| .dts | Audio | DTS Encoded Audio File |
| .dtw | Raster Image | Desktop Wallpaper |
| .dus | Misc | Readiris Font Dictionary |
| .dv | Video | Digital Video File |
| .dvd | System | DOS Device Driver <font color="#00AA33">(Most common)</font> |
| .dvd | System | DOS Device Driver (Most common) |
| .dvdproj | Data | iDVD Project File |
| .dvf | Audio | Sony Digital Voice File |
| .dvi | Text | Device Independent Format File |
| .dvl | Raster Image | Virtual Library File |
| .dvr-ms | Video | Microsoft Digital Video Recording |
| .dvx | Video | DivX Video File |
| .dwc | Misc | Emulex DWC Firmware Update File |
| .dwd | Audio | DiamondWare Digital Audio File |
| .dwf | Image | Design Web Format File |
| .dwfx | Image | Design Web Format XPS File |
| .dwg | Image | AutoCAD Drawing Database File |
| .dwi | Data | Dance With Intensity Song File |
| .dwn | Misc | Firmware Update File |
| .dwt | Web | Dreamweaver Web Page Template |
| .dx | Text | DEC WPS Plus File |
| .dxb | Vector Image | Drawing Exchange Binary |
| .dxf | Vector Image | Drawing Exchange Format File |
| .dxr | Video | Protected Macromedia Director Movie |
| .dxs | Game | Deus Ex Saved Game |
| .dylib | Developer | Dynamic Library |
