| xiu | Chiasmus Configuration |
| xjb | JAXB Binding Customization |
| xjs | Jindent Settings File |
| xly | CMUD Settings Data |
| xpadder | Xpadder Settings Data |
| xpaddercontroller | Xpadder Controller Profile |
| xpf | LMMS Presets Data |
| xss | Sorenson Squeeze Presets Data |
| xvm | VMware Server Console Configuration |
| 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 |
| zaf | ZoneCentral Access List Data |
| zap | Windows Software Installation Settings |
| zc | ZipKey Settings |
| zcc | Zephyr Communication Configuration |
| zcfg | Zoom Search Engine Config |
| zcfg | HLGuard Z Config |
| zgv | Zephyr Eclipse Server Global Variables |
| zhs | Zephyr Eclipse Server Hotspot Data |
| zpf | Form Z Preferences File |
| zvt | Adobe Photoshop Zoomify Preset |
| zxk | ZX Spectrum Vega Keymap |
| zzb | MultiView Configurable Toolbar |
| zzc | MultiView Connection Details |
| zzd | MultiView Wizard Defaults |
| zze | MultiView Emulation Details |
