| cru | Crush Compressed Archive |
| crx | Chrome Extension |
| cryptomite | CryptoMite Encrypted Archive |
| ctw | CTW Compressed File |
| ctz | Custody Toolbox Compressed Backup |
| cxarchive | CrossOver Bottle Archive |
| czar | Cherwell Archive Repository |
| czip | ZipGenius CryptoZip |
| czx | CZIP X Encrypted ZIP Archive |
| d01 | Jydivide Split |
| d02 | Jydivide Split |
| d03 | Jydivide Split |
| dalp | Intel Dynamic Application Loader Package |
| dar | DAR Disk Archive |
| darc | Darc Archive |
| dark | OpenDark Archiver Compressed File |
| dca | DCA Archive |
| dcf | Safetica Free Encrypted Archive |
| ddap | DiskDoubler Compressed Data |
| ddz | Adaptec Compressed Driver Disk Image |
| deb | Debian Package |
| deskthemepack | Microsoft Windows 8 Desktop Theme Pack |
| dfl | DEFLATE Compressed Data |
| dgc | DGCA File Archive |
| djz | DJUCED Sample Package |
| dkb | PowerQuest DataKeeper Backup |
| dm | DRM Delivery Message |
| dna | CA Backup and Migration Backup |
| doz | Zardoz Archive |
| dp | mToolkit Deployment Package |
