| DAT | Dynamic Link Library | 56619 | thumbs.dat |
| DATA | Data | 1140 | lastnames.data |
| DB | Database | 17822 | Kies3ImageDB17.db |
| DB-SHM | | 2139 | excel.exe.db-shm |
| DB-WAL | Database | 1091 | onenote.exe.db-wal |
| DBF | Database | 81 | FileType.dbf |
| DBL | System | 5 | wpa.dbl |
| DCP | Developer | 9479 | Olympus E-M1 Mark II Camera Portrait.dcp |
| DCT | Data | 210 | sonique.dct |
| DDS | Raster Image | 21055 | m16a4_3rd_silver.dds |
| DEFAULT | Internet Web | 74 | legacy.web_hightrust.config.default |
| DEP | Developer | 7 | activex.dep |
| DESKLINK | System | 7 | Desktop (create shortcut).DeskLink |
| DEU | Data | 6 | wbcache.deu |
| DGML | Developer | 3 | chstic.dgml |
| DHS | Vector Image | 1 | ID_028.DHS |
| DIA | Database | 4 | class-hierarchy.dia |
| DIAGPKG | System | 74 | DiagPackage.diagpkg |
| DIB | Raster Image | 26 | 3CEVEN.DIB |
| DIC | Dynamic Link Library | 633 | hangul.dic |
| DIR | Video | 41 | 0001000E.dir |
| DIT | | 1 | adamntds.dit |
| DLG | Game | 18 | Print.dlg |
| DLL | Dynamic Link Library | 312194 | pnpsetup.dll |
| DLM | Plugin | 38 | p1033.dlm |
| DLS | Audio | 23 | l_aquaduct.dls |
| DOC | Text | 87 | _2_Lucene41_0.doc |
| DOT | Page Layout | 90 | Contemporary Letter.dot |
| DOTX | Page Layout | 640 | OrielResume.Dotx |
| DPB | Backup | 97 | nehb1.dpb |
| DPC | Data | 7 | ID_10031.DPC |
| DPV | Settings | 576 | RESUME.DPV |
| DPX | Raster Image | 1 | InstallPackage_ETW.Log.dpx |
| DRV | Driver | 88 | sound.drv |
| DS | Executable Application | 11 | omDispStandardAttribs.ds |
| DTD | Developer | 302 | Item.dtd |
| DUN | Game | 11 | icwx25a.dun |
| DXT | Game | 233 | EP0NOE9C.DXT |
| DYC | System | 38 | XD555L_A.DYC |
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