| dcext | DC++ Extension Plugin |
| dcf | DisCryptor Encrypted Archive |
| dcf | DOpus Command File |
| dcf | OMA DRM Content Format |
| dcf | WordExpress Dictionary Data |
| dcf | WRAP Daily Flows Columnar Data |
| dch | Draft Choice Drawing |
| dck | Resolume Deck |
| dck | Warajevo Emulator Data |
| dcl | Autodesk AutoCAD Dialog Definition Data |
| dcl | BricsCAD Dialog Control Language Data |
| dcl | DesignComposer Design Command Language File |
| dcl | DumpSec Report |
| dclst | DC++ Direct Connect List |
| dcm | DiskCatalogMaker Catalog Data |
| dcmd | DiskCatalogMaker Thumbnail-Enabled Catalog Data |
| dcmf | DiskCatalogMaker Catalog Data |
| dcn | Autodesk AutoCAD Civil 3D Depth Slope Definition |
| dcn | VerdiCash Digital Cash Note |
| dco | DisCryptor Encrypted Data |
| dcover | Belight Disc Cover Data |
| dcp | DCP2 DCP Data |
| dcp | OS/2 Warp Data Codepage |
| dcpie | DocumentsCorePack Import/Export Tool Data |
| dcpy | Disk Copy Data |
| dcr | Adobe Director Shockwave Media Data |
| dcr | AstroVIEW X Data Log |
| dcs | AcaStat Data |
| dcs | Act! Activity Data |
| dcs | QuarkXPress Desktop Color Separation Data |
