| .* | Program | Prohlížeč | Popis |
| D16 | Borland Delphi | | Delphi Component Resources 16-bit |
| D32 | Borland Delphi | | Delphi Component Resources 32-bit |
| D3D | Ray Dream 3D v3 | | Ray Dream 3D soubor |
| DAA | PowerISO | | CD/DVD image file |
| DB | Corel Paradox | | Paradox Database |
| DBC | M$ Visual FoxPro | | Visual FoxPro Database |
| DBF | FoxPro, Visual FoxPro | | FoxPro Database |
| DBF | dBase, Visual dBase | | dBase database |
| DBG | ArchiCAD | | ArchiCAD Debug soubor |
| DBT | dBase | | dBase BLOb Data soubor |
| DCE | AutoCAD | | AutoCAD Dialog Error Report |
| DCL | AutoCAD | | AutoCAD Dialog Definition |
| DCP | Borland Delphi, Kylix, C++Buil | | Delphi Components Package |
| DCR | Borland Delphi, Kylix, C++Buil | | Delphi Component Resources |
| DCT | M$ Visual FoxPro | | Visual FoxPro Database memo |
| DCU | Borland Delphi, C++Builder, Ky | | Delphi Compiled Unit |
| DCX | M$ Visual FoxPro | | Database index |
| DDL | Borland InterBase | | Data Definition Language |
| DDS | M$ DirectX | | DirectDraw hladina |
| DEB | Debian Linux | | Debian instalační balíček |
| DESKTOP | GNOME | | GNOME Application Info |
| DFM | Borland Delphi, C++Builder | | Delphi Form |
| DGN | Micro Station | Bentley wiev | vektorová grafika |
| DIV | DivX | | DivX Video soubor |
| DIVX | DivX | | DivX Video soubor |
| DJVU | Document Express | pro různé OS najdete zde | DjVu ("déjà vu") je kompresovaný dokument (obr.) |
| DLL | | | Dynamicky připojovaná knihovna (Dynamic Linking Library) |
| DML | Borland InterBase | | Data Manipulation Language |
| DOC | | Libovolný textový editor | Plain Text Dokument |
| DOC | M$ Word | | Textový dokument |
| DOF | Borland Delphi | | Delphi Options soubor |
| DOR | ArchiCAD | | ArchiCAD Door soubor |
| DOT | M$ Word | | Šablona dokumentu |
| DPR | Borland Delphi, Kylix | | Delphi Projekt |
| DRV | M$ Windows | | Ovladač zařízení |
| DSK | Borland Delphi, C++Builder | | Desktop Settings |
| DSM | M$ Developer Studio | | Developer Studio Macros |
| DSP | M$ Developer Studio | | Developer Studio Projekt |
| DSW | M$ Developer Studio | | Developer Studio Workspace |
| DTD | | | XML Schema |
| DWF | AutoCAD | | Drawing Web soubor |
| DWG | AutoCAD | | Drawing |
| DWT | AutoCAD | | Drawing šablona |
| DXB | AutoCAD | | Binary Drawing Interchange soubor |
| DXF | AutoCAD | | Drawing Interchange soubor |
| DXR | Macromedia Director | | Director Executable Resources |
| DXT | AutoCAD | | AutoCAD DXFIX Support |
| DXX | AutoCAD | | DXF Attribute Extract soubor |
DB přípon souborů stále rozšiřujeme a můžete k tomu pomoci i Vy.
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