| zdb | NEPLAN Network Topology Data |
| zdb | Zimbra Database |
| zdc | CD Catalog Expert Database |
| zdct | Adobe Localization Dictionary |
| zdt | Zhongwen Development Tool Data |
| zec | Zemax Encrypted Coating File |
| zen | Zemax Face Number File |
| zfo | 602XML Form Filler Data |
| zfp | Zoner Photo Studio Exported Presets Data |
| zib | ZX-Editor Graphic Library |
| zic | ZooImage Categories Data |
| zid | ZooImage Data |
| zim | OpenZIM Archive |
| zis | ZooImage Series Description |
| zit | ZIT File Tracking Repository Data |
| zix | Quicken Data |
| zks | ZK Stereo Data |
| zkx | ZixCorp Signature Data |
| zlb | Form Z Symbol Library File |
| zlg | e-Surveiller Compressed Log |
| zlic | KeyShot License Data |
| zlog | ZTreeWin Log |
| zmc | ZoneAlarm Quarantine |
| zmesh | Imagine 3D Mesh Data |
| zmf | Zemax Lens Catalog File |
| zmg | ZENworks Desktop Management Image |
| zml | Zooming Markup Language |
| zmm | Zemax Multi-mode File |
| zmt | MOPAC Z-Matrix Molecule Data |
| zmx | Zemax Lens Data |
| zna | Zinio Annotation File |
| zncn | RMCProfile List Data. |
| znl | Number Lines Lesson Data |
| zof | Zemax Object Format File |
| zon | OmniPage Zone Template |
