| dbd | Modula-2 Debug Data |
| dbf | Alpha Five Table Data |
| dbf | Microsoft Visual FoxPro Database Table |
| dbg | IAR System XLink Debug Data |
| dbg | Microsoft Visual Studio Debug File |
| dbgdt | IAR System Debugger Desktop Data |
| dbgsym | Pidgin IM Debug Symbols Data |
| dbi | Data Explorer Information |
| dblink | Altium Designer Database Link |
| dblog | Debugview++ Debug Log |
| dbml | Database Markup Language File |
| dbo | DarkBASIC Object |
| dbp | Visual Studio Database Project |
| dbproj | Visual Studio 2010 Database Project |
| dcf | ProWorx NXT Database Configuration |
| dci | RAD Studio Delphi Code Insight |
| dcp | Delphi Component Package |
| dcpil | Delphi Compiler Symbolic Information Data |
| dcr | Delphi Component Resource |
| dct | Delphi Component Template |
| dct | Visual FoxPro Database Container Memo |
| dcu | Delphi Compiled Unit |
| dcuil | Delphi .NET Compiled Unit |
| dcurl | Curl Detached Applet |
| dd | DataFlex Data Dictionary |
| dd32 | x64dbg Data |
| dd64 | x64dbg Data |
| dda | GLBasic ASCII Scene Data |
| ddb | ProWorx NXT Descriptor Data with Blocking |
| ddb | Transputer Development System Occam Debugging Info |
