| zis | ZooImage Series Description |
| zit | ZIT File Tracking Repository Data |
| zix | Quicken Data |
| zjv | PARTsolutions 3D Model |
| zkn | Adobe RoboHelp WebHelp Skin Definition |
| zks | ZK Stereo Data |
| zktx | libGDX Compressed Texture Data |
| zkx | ZixCorp Signature Data |
| zlb | Form Z Symbol Library File |
| zlg | e-Surveiller Compressed Log |
| zlic | KeyShot License Data |
| zlog | ZTreeWin Log |
| zma | ZMA Impedance Response Data |
| 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 Zinc Neighbours Data |
| znl | Number Lines Lesson Data |
| znm | ZBrush NoiseMaker Data |
| znt | SigmaWin+ Zone Table Data |
| zof | Zemax Object Format File |
| zon | OmniPage Zone Template |
| zon | Verity Collection Building Custom Zone |
| zone | ISC Bind Zone Data |
| zot | Zoot Information Processor Database |
| zpa | Vielklang Audio Metadata |
| zpac | Marvelous Designer 3D Garment |
| zpc | ZappR Compiled Patch |
| zpic | Zoom Player Install Center Text Data |