| Extension | File Description |
| .DBB | Settings Files |
| .DBC | Database Files |
| .DBD | Data Files |
| .DBE | Uncommon Files |
| .DBF | Database Files |
| .DBG | Settings Files |
| .DBH | Uncommon Files |
| .DBI | Uncommon Files |
| .DBJ | Uncommon Files |
| .DBK | Backup Files |
| .DBKIT | Uncommon Files |
| .DBL | 3D Image Files |
| .DBLS | Uncommon Files |
| .DBM | Web Files |
| .DBN | Uncommon Files |
| .DBNML | Uncommon Files |
| .DBO | Developer Files |
| .DBOOK | Uncommon Files |
| .DBP | Uncommon Files |
| .DBPRO | Developer Files |
| .DBQ | CAD Files |
| .DBR | Disk Image Files |
| .DBS | 3D Image Files |
| .DBSONG | Uncommon Files |
| .DBT | Database Files |
| .DBTOOLS | Uncommon Files |
| .DBU | Uncommon Files |
| .DBV | Database Files |
| .DBW | Uncommon Files |
| .DBWRITER | Uncommon Files |
| .DBX | Plugin Files |
| .DBY | Uncommon Files |
| .DBZ | Uncommon Files |
| .DB_ | Uncommon Files |
| .DC | CAD Files |
| .DC$ | Uncommon Files |
| .DC+ | Uncommon Files |
| .DC0 | Uncommon Files |
| .DC1 | CAD Files |
| .DC2 | CAD Files |
| .DC3 | CAD Files |
| .DC4 | Uncommon Files |
| .DC5 | Uncommon Files |
| .DC6 | Uncommon Files |
| .DC7 | Uncommon Files |
| .DC8 | Uncommon Files |
| .DC9 | Uncommon Files |
| .DCA | Uncommon Files |
| .DCB | Database Files |
| .DCC | Uncommon Files |
| .DCD | CAD Files |
| .DCE | Video Files |
| .DCF | Encoded Files |
| .DCG | Uncommon Files |
| .DCH | Uncommon Files |
| .DCI | Uncommon Files |
| .DCIM | Uncommon Files |
| .DCJ | Uncommon Files |
| .DCK | Video Files |
| .DCL | Settings Files |
| .DCLST | Uncommon Files |
| .DCM | Raster Image Files |
| .DCMD | Data Files |
| .DCN | Uncommon Files |
| .DCO | Encoded Files |
| .DCP | Developer Files |
| .DCPIL | Uncommon Files |
| .DCQ | Uncommon Files |
| .DCR | Video Files |
| .DCS | Vector Image Files |
| .DCT | Misc Files |
| .DCTMP | Misc Files |
| .DCU | Developer Files |
| .DCUIL | Developer Files |
| .DCURL | Text Files |
| Extension | File Description |
| .DCV | Uncommon Files |
| .DCW | Uncommon Files |
| .DCX | Page Layout Files |
| .DCY | Uncommon Files |
| .DCZ | Uncommon Files |
| .DC~ | CAD Files |
| .DD | Compressed Files |
| .DD0 | Uncommon Files |
| .DD1 | Uncommon Files |
| .DD2 | Uncommon Files |
| .DD3 | Uncommon Files |
| .DD3E | Uncommon Files |
| .DD4 | Uncommon Files |
| .DD5 | Uncommon Files |
| .DD6 | Uncommon Files |
| .DD7 | Uncommon Files |
| .DD8 | Uncommon Files |
| .DD9 | Uncommon Files |
| .DDA | Uncommon Files |
| .DDATA | Uncommon Files |
| .DDB | Data Files |
| .DDC | Data Files |
| .DDD | 3D Image Files |
| .DDE | Uncommon Files |
| .DDF | Settings Files |
| .DDG | Uncommon Files |
| .DDH | Uncommon Files |
| .DDI | Uncommon Files |
| .DDIF | Uncommon Files |
| .DDJ | Uncommon Files |
| .DDK | Uncommon Files |
| .DDL | Uncommon Files |
| .DDM | Uncommon Files |
| .DDN | Uncommon Files |
| .DDNA | Uncommon Files |
| .DDO | Uncommon Files |
| .DDOC | Uncommon Files |
| .DDP | Uncommon Files |
| .DDPOKERSAV | Uncommon Files |
| .DDQ | Uncommon Files |
| .DDR | Uncommon Files |
| .DDRT | Uncommon Files |
| .DDS | Raster Image Files |
| .DDT | Data Files |
| .DDU | Uncommon Files |
| .DDV | Uncommon Files |
| .DDW | Uncommon Files |
| .DDX | Uncommon Files |
| .DDY | Uncommon Files |
| .DDZ | Uncommon Files |
| .DE | Uncommon Files |
| .DE$ | Uncommon Files |
| .DE0 | Uncommon Files |
| .DE1 | Uncommon Files |
| .DE2 | Uncommon Files |
| .DE3 | Uncommon Files |
| .DE4 | Uncommon Files |
| .DE5 | Uncommon Files |
| .DE6 | Uncommon Files |
| .DE7 | Uncommon Files |
| .DE8 | Uncommon Files |
| .DE9 | Uncommon Files |
| .DEA | Uncommon Files |
| .DEAD | Uncommon Files |
| .DEAR | Uncommon Files |
| .DEB | Compressed Files |
| .DEBIAN | Uncommon Files |
| .DEBUG | Uncommon Files |
| .DEC | Developer Files |
| .DECK | Uncommon Files |
| .DECOR | Uncommon Files |
| .DED | Uncommon Files |
| .DEE | Uncommon Files |
| .DEELITED | Uncommon Files |
| .DEF | Developer Files |
