| Extension | File Description |
| .DC9 | Uncommon Files |
| .DCA | Uncommon Files |
| .DCC | Uncommon Files |
| .DCG | Uncommon Files |
| .DCH | Uncommon Files |
| .DCI | Uncommon Files |
| .DCIM | Uncommon Files |
| .DCJ | Uncommon Files |
| .DCLST | Uncommon Files |
| .DCN | Uncommon Files |
| .DCPIL | Uncommon Files |
| .DCQ | Uncommon Files |
| .DCV | Uncommon Files |
| .DCW | Uncommon Files |
| .DCY | Uncommon Files |
| .DCZ | Uncommon 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 |
| .DDE | Uncommon 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 |
| .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 |
| .DEBIAN | Uncommon Files |
| .DEBUG | Uncommon Files |
| .DECK | Uncommon Files |
| .DECOR | Uncommon Files |
| .DED | Uncommon Files |
| .DEE | Uncommon Files |
| .DEELITED | Uncommon Files |
| Extension | File Description |
| .DEFAULT | Uncommon Files |
| .DEFAULTS | Uncommon Files |
| .DEFENSE | Uncommon Files |
| .DEFI | Uncommon Files |
| .DEFS | Uncommon Files |
| .DEG | Uncommon Files |
| .DEH | Uncommon Files |
| .DEI | Uncommon Files |
| .DEJ | Uncommon Files |
| .DEJAVU-THE | Uncommon Files |
| .DEL | Uncommon Files |
| .DELAY | Uncommon Files |
| .DELETE | Uncommon Files |
| .DELTA | Uncommon Files |
| .DEMO | Uncommon Files |
| .DEMO2 | Uncommon Files |
| .DEMOPIC | Uncommon Files |
| .DEN | Uncommon Files |
| .DEO | Uncommon Files |
| .DEPLOY | Uncommon Files |
| .DEPOT | Uncommon Files |
| .DEPR | Uncommon Files |
| .DEPRO | Uncommon Files |
| .DEPROTECT | Uncommon Files |
| .DEPROTECTS | Uncommon Files |
| .DEQ | Uncommon Files |
| .DESCR | Uncommon Files |
| .DESD | Uncommon Files |
| .DESK | Uncommon Files |
| .DESKEDIT | Uncommon Files |
| .DESKTRCKR | Uncommon Files |
| .DET | Uncommon Files |
| .DETAILS | Uncommon Files |
| .DETECTOR | Uncommon Files |
| .DEU | Uncommon Files |
| .DEVEL | Uncommon Files |
| .DEVHELP | Uncommon Files |
| .DEVIATION | Uncommon Files |
| .DEVLIST | Uncommon Files |
| .DEW | Uncommon Files |
| .DEY | Uncommon Files |
| .DEZ | Uncommon Files |
| .DE_ | Uncommon Files |
| .DF | Uncommon Files |
| .DF$ | Uncommon Files |
| .DF0 | Uncommon Files |
| .DF10 | Uncommon Files |
| .DF3 | Uncommon Files |
| .DF4 | Uncommon Files |
| .DF5 | Uncommon Files |
| .DF6 | Uncommon Files |
| .DF7 | Uncommon Files |
| .DF8 | Uncommon Files |
| .DF9 | Uncommon Files |
| .DFA | Uncommon Files |
| .DFB | Uncommon Files |
| .DFCLASS | Uncommon Files |
| .DFCOMPONEN | Uncommon Files |
| .DFD | Uncommon Files |
| .DFE | Uncommon Files |
| .DFG | Uncommon Files |
| .DFH | Uncommon Files |
| .DFI | Uncommon Files |
| .DFJ | Uncommon Files |
| .DFK | Uncommon Files |
| .DFL | Uncommon Files |
| .DFN | Uncommon Files |
| .DFO | Uncommon Files |
| .DFPACKAGE | Uncommon Files |
| .DFQ | Uncommon Files |
| .DFR | Uncommon Files |
| .DFS | Uncommon Files |
| .DFSEQUENCE | Uncommon Files |
| .DFU | Uncommon Files |
| .DFV | Uncommon Files |
