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The most important file types used in Windows, Mac OS and Linux/ Unix, grouped by their extension's first letter.

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File types by extension - D

These are all file name extensions starting with letter D.


  • .dat - Generic data file
  • .db - Generic database file
  • .dbc - Visual FoxPro database file
  • .dbf - DBase III database file / FoxPro database file / ArcView dBASE file
  • .dbg - MS-Dev debug file
  • .dbi - Delphi Database Explorer file
  • .dbx - FoxPro table file / Outlook Express file
  • .dci - Delphi code template file
  • .dcp - Delphi component package
  • .dcr - Delphi component resource file / Shockwave file
  • .dct - Delphi file / FoxPro file / Aurora dictionary
  • .dcu - Delphi compiled unit
  • .dcx - FoxPro database index
  • .ddp - Delphi diagram portfolio file
  • .ddi - DiskDupe image file
  • .deb - Package file
  • .def - Windows library definition file
  • .dem - Delphi file / Descent 1/2 demo file
  • .dep - Dependency file
  • .det - Descent Manager file
  • .dfm - Delphi form file
  • .dfn - Delphi support file for integrated translation environment
  • .dft - Solid Edge drafting file
  • .dir - Shockwave file
  • .dlg - Windows dialog resource file
  • .dll - Dynamic Linked Library
  • .dmg - Macintosh Disk Image
  • .dmp - (Windows) Dump file
  • .dmt - Delphi menu template file
  • .doc - Word document / Word Perfect document
  • .dof - Delphi options file
  • .dot - Microsoft word template
  • .dpk - Delphi package
  • .dpl - Delphi 3 package library
  • .dro - Delphi object repository file
  • .dpr - Delphi project file
  • .drv - Driver file
  • .dsk - Delphi desktop file
  • .dsm - Delphi symbol module / Visual Studio macro file
  • .dsn - Tiny CAD file / ODBC File DSN
  • .dst - Delphi desktop settings file OR (see next line)
  • .dst - AutoCAD Sheet Set file
  • .dti - Delphi 5 diagram portfolio file
  • .dtp - Timeworks publisher text file, an older desktop publishing program
  • .dun - Dial-up networking configuration file
  • .dwf - Autocad drawing
  • .dwg - Autocad drawing
  • .dxb - Autocad drawing, binary exchange format file
  • .dxf - Autocad drawing exchange format file
  • .dxr - Shockwave file



Generated 8:02:07 on May 26, 2018