| .D0 | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .D2J | Unknown Developer | Ficheiros de Desenvolvedor | D2jsp Script File | Unknown Software | Unknown Developer |
| .DA! | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .DA5032 | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .DAB | Epigon Media Technologies | Ficheiros de Áudio | Digital Audio Broadcasting Audio Data | Unknown Software | Unknown Developer |
| .DANGER | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .DARBY | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .DATAGRABBER | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .DATALESS | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .DATALINKHE | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .DATE | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .DBU | Unknown Developer | Ficheiros de Dados | Client-Course Manager Database Expansion Update | Unknown Software | Unknown Developer |
| .DB_ | Unknown Developer | Ficheiros CAD | CAD File | Unknown Software | Unknown Developer |
| .DCHB1 | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .DDA | MicroImages | Ficheiros Gráficos | TNTmips Import File Format | Unknown Software | Unknown Developer |
| .DDI | Unknown Developer | Ficheiros de Imagem de Disco | DiskDupe Disk Image | Unknown Software | Unknown Developer |
| .DDO | Unknown Developer | Ficheiros de Jogo | Tank3D Game Data | Unknown Software | Unknown Developer |
| .DE | Interscape | Ficheiros de Layout de Página | DrawExpress Diagram File | Unknown Software | Unknown Developer |
| .DEFAULT | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .DFCOMPONEN | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .DFI | Unknown Developer | Ficheiros de Fonte | Digifont Outline Font Description File | Unknown Software | Unknown Developer |
| .DFINE | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .DFM | Open Source | Ficheiros de Texto | Pascal File | Unknown Software | Unknown Developer |
| .DHR | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .DIH | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .DISPOSITIO | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .DJE | Unknown Developer | Ficheiros de Áudio | MattBatt iAM-player Track List | Unknown Software | Unknown Developer |
| .DK | Unknown Developer | Uncommon Files | Danish Text/localization File | Unknown Software | Unknown Developer |
| .DLFA | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .DMJ | Unknown Developer | Uncommon Files | Dustman Selection for Delete File | Unknown Software | Unknown Developer |
| .DMV | Adobe Systems Incorporated | Ficheiros de Configurações | Adobe Acrobat Catalog Data | Unknown Software | Unknown Developer |
| .DNA.XML | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .DNAXML | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .DOCS | Unknown Developer | Ficheiros de Texto | Document | Unknown Software | Unknown Developer |
| .DOCUMENTAT | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .DOO | Atari Corporation | Ficheiros de Imagem Raster | Atari Doodle Image | Unknown Software | Unknown Developer |
| .DORE | Unknown Developer | Uncommon Files | Dore Raster Files Format | Unknown Software | Unknown Developer |
| .DOWN | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .DOYO000 | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .DP | Stefan Hagel | Ficheiros de Texto | Text Document | Unknown Software | Unknown Developer |
| .DR9 | Unknown Developer | Uncommon Files | Directory Files | Unknown Software | Unknown Developer |
| .DRAFT | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .DRAGONSFUN | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .DRIVE | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .DRIVERS | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .DRZ | Unknown Developer | Ficheiros de Imagem Raster | Draz Paint File | Unknown Software | Unknown Developer |
| .DR_ | Unknown Developer | Uncommon Files | Compressed DRV File Of VFW | Unknown Software | Unknown Developer |
| .DSJ | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .DSSC | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .DST- | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .DTED | Unknown Developer | Ficheiros Gráficos | Digital Terrain Elevation Geographical Data File Format | Unknown Software | Unknown Developer |
| .DTR | Swisslog | Ficheiros de Dados | Swisslog Downtime Analyzer Report | Unknown Software | Unknown Developer |
| .DUC | Datel | Ficheiros de Jogo | Action Replay Max DS Save File | Unknown Software | Unknown Developer |
| .DUPLICATEZ | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .DVDREGIONC | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .DVDRIP | Unknown Developer | Ficheiros de Vídeo | DVD Disk Image | Unknown Software | Unknown Developer |
| .DWV | Unknown Developer | Uncommon Files | WAV File | Unknown Software | Unknown Developer |
| .DYNAMO | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .D_ | Unknown Developer | Ficheiros de Áudio | Seqmax Seqprest Compressed Audio File | Unknown Software | Unknown Developer |
| .D_3 | Unknown Developer | Ficheiros de Dados | Polytext Ma'archot Meida Co. S"TaM | Unknown Software | Unknown Developer |
| .D_T | Unknown Developer | Uncommon Files | Eru/erd File | Unknown Software | Unknown Developer |
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