| zdf | Zone Definition File |
| zdm | SIPINA Zlib Compressed FDM Data |
| zdt | Zhongwen Development Tool Data |
| zdtc | Adobe After Effects Language Settings |
| zec | Zemax Encrypted Coating File |
| zen | Zemax Face Number File |
| zeon | VUE Installation Data |
| zer | Zerberus Data |
| zes | Zemax Emission Spectrum Data |
| zes | ZigBee Event System Data |
| zex | Zemax Excitation Spectrum Data |
| zfo | 602XML Form Filler Data |
| zfp | Zoner Photo Studio Exported Presets Data |
| zfx | ZipForm Exported Data |
| zgraph | L3DT ZeoGraph XML Data |
| zgy | Petrel Compressed Seismic Data |
| zhp | CRiSP Harvest Help Data |
| zh_tw | Netscape Communicator Java Language Classes |
| zib | ZX-Editor Graphic Library |
| zic | ZooImage Categories Data |
| zid | ZooImage Data |
| zif | Adobe Photoshop Zoomify Image Format Data |
| zig | ZIG Game Construction Kit Game Data |
| zil | DMDX ZIL Output Data |
| zim | OpenZIM Archive |
| zimaa | Kiwix Data |
| zimaa | OpenZIM Splitted Archive |
| zimab | OpenZIM Splitted Archive |
| zimac | OpenZIM Splitted Archive |
| zin | ZINDO Input Data |
