| dad | RemObjects Delphi Data Abstract Driver |
| dadiagrams | RemObjects Data Abstract Data Diagrams |
| dadx | Eclipse Document Access Definition Extension |
| dart | Dart Source Code |
| das | Atari Jaguar DSP Assembly Source |
| daschema | RemObjects Data Abstract Schema |
| datasource | Microsoft Visual Studio Data Source |
| db | Atari Jaguar Debugger Script |
| db2sp | Visual Studio DB2 Create Procedure Statement Data |
| db2tbl | Microsoft Visual Studio DB2 Table Script |
| db2tr | Microsoft Visual Studio DB2 Trigger Script |
| db2udf | Visual Studio DB2 User Defined Function Data |
| db2vw | Microsoft Visual Studio DB2 View Script |
| dba | Amazon Lumberyard Animation Database |
| dba | DarkBASIC Source Code |
| dbag | WinSQL DataBag Data |
| 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 |
| dbk | DocBook Source Code |
| dblink | Altium Designer Database Link |
| dblog | Debugview++ Debug Log |
| dbml | Database Markup Language File |
| dbo | DarkBASIC Object |
| dbp | Visual Studio Database Project |
