| z96 | Microsoft Bookshelf 96 Update Package |
| zac | Zaurus Archive |
| zat | MSN Gaming Zone Data File |
| zbk | Zarafa Backup Archive |
| zet | ZET Compressed Archive |
| zfc | Back4Win Backup Archive |
| zfsendtotarget | Windows Zipped Folder |
| zfx | ZFX Archive |
| zgz | Zimbra Compressed Package |
| zip | ZIP Archive |
| zipe | Minecraft ZIPE Archive |
| zipx | WinZIP ZIPX Archive |
| zl | Zlib Compressed Data |
| zlib | Zlib Compressed Data |
| zom | Amiga Zoom Compressed Archive |
| zoo | Zoo Compressed Archive |
| zpaq | ZPAQ Compressed Archive |
| zpg | ZQuest Editor Graphics Pack |
| zpkg | Zyxel NSA-32x Application Package |
| zpp | ZPanel Package |
| zps | Zebra Portable Safe File |
| zpw | ZippedWeb Archive |
| zrp | VMware VCM UNIX Agent ZRP Archive |
| zsplit | Incredible Bee Archiver ZipSplit File |
| ztc | Vijeo Designer Exported Toolchest Folder |
| ztmp | Valve Steam Compressed Game Resource |
| zz | Zzip Compressed Archive |