Use this property to set and get and XmlDocument representing your app's Preference Window. Default locations are Win32 ~/[appname]_preferences/[appname]_preferences folder's visible property is set to false Linux ~/.[appname]_preferences Mac OSX saved as an entry in ~/Library/Preferences/[app identifier].plist with the key "PreferenceWindowSettings" Be sure to set your app identifier or nothing will be saved! You can override these by using GetPreferencesDoc and SetPreferencesDoc and passing a FolderItem(Win32/Linux) or Key String(MacOS), this also allows for multiple preference windows.