| File Extension | Description |
| Z | Archive |
| Z01-Z99 | Split WinRAR Archive |
| Z2S | Zoo Tycoon 2 saved game |
| Z3 | Infocom game module |
| Z3D | Zmodeler-file |
| Z64 | Nintendo 64 ROM |
| Z80 | Snapshot |
| ZAD | ZFax digitized voice file |
| ZDG | Compressed ZiffNet text document |
| ZED | BitTorrent Link |
| ZER | Data file |
| ZIP | Archive |
| ZOO | Zoo Tycoon saved game |
| ZZT | ZZT World |
