| zkx | ZixCorp Signature Data |
| zl | Easy CD Creator Drag to Disk Data |
| zl | Money S3 Temporary Data |
| zlb | Form Z Symbol Library File |
| zlg | e-Surveiller Compressed Log |
| zlic | KeyShot License Data |
| zlog | ZTreeWin Log |
| zlorb | Frotz Interactive Fiction Engine Data |
| zlx | Atlantis Word Processor Spellchecker Dictionary |
| zma | Room EQ Wizard Impendance Data |
| zma | ZMA Impedance Response Data |
| zmat | ACES II Z-Matrix 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 |
| znc | Zinc Emulator Plugin |
| zncn | RMCProfile Zinc Neighbours Data |
| znl | Number Lines Lesson Data |
| znm | ZBrush NoiseMaker Data |
| znt | SigmaWin+ Zone Table Data |
| znx | RS ZND Vector Network Analyzer Data |
| zn~ | Zinio Reader Temporary Data |
| zof | Zemax Object Format File |
| zol | Zoll RescueNet Code Review Data |
| zon | OmniPage Zone Template |
| zon | Verity Collection Building Custom Zone |
| zone | ISC Bind Zone Data |
| zook | BAMZOOKi Zook Data |
| zoommtg | Zoom Meetings Data |
