| zak | Carlson Survey Coordinate Data |
| zapc | ArcSoft Print Creations |
| zar | Zemax Archive |
| zargo | ArgoUML Model Data |
| zav | MT-Card Saved Game Data |
| zbb | Zemax Black Box Data |
| zbd | Canon ZoomBrowser EX Database |
| zbf | Radiance Z-buffer File |
| zbf | Zemax Beam File |
| zbin | Report Server Localization Data |
| zbp | Boardmaker Compressed Package |
| zch | ZIG Game Construction Kit Data |
| zcode | Z-Suite Code |
| zcr | ZenCrack Data |
| zcv | Zortech 3 Tools Readme Document |
| zda | GP32 ZDA Compressed Archive |
| zdb | Zimbra Database |
| zdb | NEPLAN Network Topology Data |
| 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 |
| zgraph | L3DT ZeoGraph XML Data |
| zgy | Petrel Compressed Seismic 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 |
| zjv | PARTsolutions 3D Model |
