| dbtmsg | DB/TextWorks Messages Textbase |
| dbu | Client-Course Manager Database Expansion Update |
| dbv | dBase Database Variable Field |
| dbv | FlexFile Memo Field Data |
| dbw | Alfrin Pedigree Database |
| dbw | DataBoss Database |
| dbwal | iOS CalDAV Temporary Sync Data |
| dbx | Alteros 3D Thumbnail Cache |
| dbx | Autodesk AutoCAD Database Extension |
| dbx | Dropbox Encrypted Database |
| dbx | Microsoft Outlook Express Folder Database |
| dby | Dolby CP650 Data |
| dbz | DB Zipper Archive |
| dc | Microsoft SMS Collection Evaluator Deletion Data |
| dc | SPICE DC Data |
| dc1 | Bloomba E-mail Message |
| dc2 | Kodak Photo-Enhancer DC2 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 |
| dcd | Document Content Description for XML Data |
| dce | Autodesk AutoCAD DCL Error Log |
| dce | BricsCAD Dialog Error Log |
| dcext | DC++ Extension Plugin |
| dcf | DisCryptor Encrypted Archive |
| dcf | DOpus Command File |
