| xwk | Crosstalk Communicator Keyboard Mapping |
| xwms | WMS Server Connection Data |
| xxe_gui | XMLmind XML Editor GUI Settings Data |
| yardopts | YARD Settings |
| ysm | Yamaha Studio Manager Settings Data |
| yt | yt Project Configuration |
| z7d | BlueZone ICL 7561 Display Settings Data |
| zaf | ZoneCentral Access List Data |
| zap | Windows Software Installation Settings |
| zc | ZipKey Settings |
| zcc | Zephyr Communication Configuration |
| zcfg | HLGuard Z Config |
| zcfg | Zoom Search Engine Config |
| zfg | ZOC Settings Data |
| zft | BlueZone FTP Configuration |
| zgv | Zephyr Eclipse Server Global Variables |
| zhs | Zephyr Eclipse Server Hotspot Data |
| zmd | BlueZone Mainframe Display Settings Data |
| znn | ZNN Network Architecture Configuration |
| zoc | ZOC Client Configuration Data |
| zpf | Form Z Preferences File |
| zprf | ZipIt Preferences Data |
| zsc | Zend Studio Server Settings Data |
| ztd | BlueZone T27 Display Settings Data |
| ztn | ZOC SSH Tunnel Settings Data |
| zud | BlueZone UTS Display Settings Data |
| zvt | Adobe Photoshop Zoomify Preset |
| zvt | BlueZone VT Settings Data |
| zxk | ZX Spectrum Vega Keymap |
| zz0 | NetBSD ZZ0 Interface Configuration |
