| dbw | Alfrin Pedigree Database |
| dbw | DataBoss Database |
| dbwal | iOS CalDAV Temporary Sync Data |
| dbx | Autodesk AutoCAD Database Extension |
| dbx | Microsoft Outlook Express Folder Database |
| dby | Dolby CP650 Data |
| dbz | DB Zipper Archive |
| dc | Microsoft SMS Collection Evaluator Deletion Data |
| dc4 | ViaThinkSoft DeCoder 4 File |
| dca | Visual Basic Active Designer Cache |
| dcb | Concordance Database |
| dcb | DAZ Studio Custom Brick |
| dcb | TrialDirector Concordance Database |
| dcd | CHARMM DCD File |
| dcd | DisCryptor Encrypted Database |
| dce | Autodesk AutoCAD DCL Error Log |
| dcext | DC++ Extension Plugin |
| dcf | DOpus Command File |
| dcf | OMA DRM Content Format |
| dcf | WordExpress Dictionary Data |
| dcf | WRAP Daily Flows Columnar Data |
| dck | Resolume Deck |
| dck | Warajevo Emulator Data |
| dcl | Autodesk AutoCAD Dialog Definition Data |
| dcl | DesignComposer Design Command Language File |
| dcl | DumpSec Report |
| dcm | DiskCatalogMaker Catalog Data |
| dcmd | DiskCatalogMaker Thumbnail-Enabled Catalog Data |
| dcmf | DiskCatalogMaker Catalog Data |
| dcn | Autodesk AutoCAD Civil 3D Depth Slope Definition |
