| ctz | Custody Toolbox Compressed Backup |
| cwu | Across crossWAN Package |
| cxarchive | CrossOver Bottle Archive |
| czar | Cherwell Archive Repository |
| czip | ZIPGenius CryptoZip Archive |
| czx | CZIP X Encrypted ZIP Archive |
| d01 | Jydivide Split |
| d02 | Jydivide Split |
| d03 | Jydivide Split |
| d5p | Dragon UnPACKer Language Pack |
| dalp | Intel Dynamic Application Loader Package |
| dar | DAR Disk Archive |
| darc | Darc Archive |
| dark | OpenDark Archiver Compressed File |
| data | Acronis True Image Backup |
| dca | DCA Archive |
| dcf | Safetica Free Encrypted Archive |
| ddap | DiskDoubler Compressed Data |
| ddz | Adaptec Compressed Driver Disk Image |
| deb | Debian Package |
| decrypt | Decrypted Microsoft ESD File |
| deskthemepack | Microsoft Windows 8 Desktop Theme Pack |
| devpak | Dev-C++ Developer Package |
| dfl | DEFLATE Compressed Data |
| dgc | DGCA File Archive |
| dicombz2 | BZip2 Compressed DICOM Image |
| dicomzip | Zipped DICOM Image |
| dix | DIVA-GIS Exported Project |
| djz | DJUCED Sample Package |
| dkb | PowerQuest DataKeeper Backup |
| dm | DRM Delivery Message |
| dmd | DreamMail Backup |
| dna | CA Backup and Migration Backup |
| dockzip | ObjectDock Docklet Archive |
| doz | Zardoz Archive |
