silverlight 2 also allows limited filesystem access to silverlight applications. it can use the operating system's native file dialog box to browse to any file (to which the user has access). the file is sanitized of path information, to prevent the application from getting access to information such as user name, and can be opened only in read-only mode. for local storage of data, silverlight provides "isolated local storage" (isostorage), namely, outside the browser cache, in a folder hidden inside the private user-profile folder. it is set to 1 mb per url by default, but this can be changed by the user. data stored by a silverlight application in the isostorage is identified by the url from which it loads, and can be accessed by that application only. all instances of silverlight share the same isostorage, so all instances of the same silverlight application can share the saved data, even if they are running on different browsers.