| .D0 | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .D01 | Yamaha Corporation | Fichiers audio | OPL2 FM Audio File | Winamp with Ganbatte! Plug-in | Unknown Developer |
| .D2D | Unknown Developer | Fichiers CAD | 3D Fassade Plus CAD Data | 3D Fassade Plus | Unknown Developer |
| .D2J | Unknown Developer | Fichiers de développeurs | D2jsp Script File | Unknown Software | Unknown Developer |
| .D2R | Unknown Developer | Fichiers de jeu | Dazzle Dazzle Realization File | Dazzle Dazzle Realization | Unknown Developer |
| .DA! | Unknown Developer | Fichiers divers | Uncommon File Extension | Unknown Software | Unknown Developer |
| .DA0 | Microsoft Corporation | Fichiers de sauvegarde | Windows Registry Backup File | Should Not Be Opened Manually | Unknown Developer |
| .DA5032 | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .DAB | Epigon Media Technologies | Fichiers audio | Digital Audio Broadcasting Audio Data | Unknown Software | Unknown Developer |
| .DANGER | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .DARBY | Unknown Developer | Fichiers divers | Uncommon File Extension | Unknown Software | Unknown Developer |
| .DATAGRABBER | Apple | Fichiers de données | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .DATALESS | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .DATALINKHE | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .DATE | Apple | Fichiers de données | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .DBU | Unknown Developer | Fichiers de données | Client-Course Manager Database Expansion Update | Unknown Software | Unknown Developer |
| .DBX | Microsoft Corporation | Fichiers divers | Outlook Express E-mail Folder | Formula Graphics | Unknown Developer |
| .DB_ | Unknown Developer | Fichiers CAD | CAD File | Unknown Software | Unknown Developer |
| .DCHB1 | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .DDA | MicroImages | Fichiers graphiques | TNTmips Import File Format | Unknown Software | Unknown Developer |
| .DDI | Unknown Developer | Fichiers d’image de disque | DiskDupe Disk Image | Unknown Software | Unknown Developer |
| .DDO | Unknown Developer | Fichiers de jeu | Tank3D Game Data | Unknown Software | Unknown Developer |
| .DE | Interscape | Fichiers de mise en page | DrawExpress Diagram File | Unknown Software | Unknown Developer |
| .DEFAULT | Apple | Fichiers de données | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .DFA | Unknown Developer | Fichiers de données | Amateur Strip Poker Data | Amature Strip Poker | Unknown Developer |
| .DFCOMPONEN | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .DFI | Unknown Developer | Fichiers de police d’écriture | Digifont Outline Font Description File | Unknown Software | Unknown Developer |
| .DFINE | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .DFM | Open Source | Fichiers textes | Pascal File | Unknown Software | Unknown Developer |
| .DHI | Unknown Developer | Fichiers de données | DriverHound Index File | DriverHound | Unknown Developer |
| .DHR | Apple | Fichiers de données | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .DIH | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .DISPOSITIO | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .DJE | Unknown Developer | Fichiers audio | MattBatt iAM-player Track List | Unknown Software | Unknown Developer |
| .DK | Unknown Developer | Fichiers divers | Danish Text/localization File | Unknown Software | Unknown Developer |
| .DLFA | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .DLR | cebas Visual Technology | Fichiers de plugin | FinalRender Plugin | TIB Browser | Unknown Developer |
| .DMJ | Unknown Developer | Fichiers divers | Dustman Selection for Delete File | Unknown Software | Unknown Developer |
| .DMV | Adobe Systems Incorporated | Fichiers de paramètres | Adobe Acrobat Catalog Data | Unknown Software | Unknown Developer |
| .DNA.XML | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .DNAXML | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .DOCS | Unknown Developer | Fichiers textes | Document | Unknown Software | Unknown Developer |
| .DOCUMENTAT | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .DOO | Atari Corporation | Fichiers Raster Image | Atari Doodle Image | Unknown Software | Unknown Developer |
| .DORE | Unknown Developer | Fichiers divers | Dore Raster Files Format | Unknown Software | Unknown Developer |
| .DOV | Safer Networking Ltd. | Fichiers divers | Temporary (Temp) File | Original Program That Created The File | Unknown Developer |
| .DOWN | Apple | Fichiers de données | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .DOYO000 | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .DP | Stefan Hagel | Fichiers textes | Text Document | Unknown Software | Unknown Developer |
| .DR9 | Unknown Developer | Fichiers divers | Directory Files | Unknown Software | Unknown Developer |
| .DRAFT | Apple | Fichiers de données | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .DRAGONSFUN | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .DRIVE | Apple | Fichiers de données | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .DRIVERS | Apple | Fichiers de données | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .DRN | Unknown Developer | Fichiers de données | Darn for DOS Data File | Darn software | Unknown Developer |
| .DRY | Unknown Developer | Fichiers de données | XAIRON Organizer Diary File | XAIRON Organizer | Unknown Developer |
| .DRZ | Unknown Developer | Fichiers Raster Image | Draz Paint File | Unknown Software | Unknown Developer |
| .DR_ | Unknown Developer | Fichiers divers | Compressed DRV File Of VFW | Unknown Software | Unknown Developer |
| .DSJ | Unknown Developer | Fichiers divers | Uncommon File Extension | Unknown Software | Unknown Developer |
| .DSSC | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .DST- | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .DTED | Unknown Developer | Fichiers graphiques | Digital Terrain Elevation Geographical Data File Format | Unknown Software | Unknown Developer |
| .DTR | Swisslog | Fichiers de données | Swisslog Downtime Analyzer Report | Unknown Software | Unknown Developer |
| .DUC | Datel | Fichiers de jeu | Action Replay Max DS Save File | Unknown Software | Unknown Developer |
| .DUPLICATEZ | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .DVDREGIONC | Unknown Developer | Fichiers divers | Unknown File Type | Unknown Software | Unknown Developer |
| .DVDRIP | Unknown Developer | Fichiers vidéo | DVD Disk Image | Unknown Software | Unknown Developer |
| .DWV | Unknown Developer | Fichiers divers | WAV File | Unknown Software | Unknown Developer |
| .DYNAMO | Apple | Fichiers de données | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .D_ | Unknown Developer | Fichiers audio | Seqmax Seqprest Compressed Audio File | Unknown Software | Unknown Developer |
| .D_3 | Unknown Developer | Fichiers de données | Polytext Ma'archot Meida Co. S"TaM | Unknown Software | Unknown Developer |
| .D_T | Unknown Developer | Fichiers divers | Eru/erd File | Unknown Software | Unknown Developer |
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