Writing file to desktop using HTML5 FileSystem API

I'm playing around a bit with the FileSystem API.

I've found a lot of examples where you generate a download link and let the user download the file the "browser way".

I would like to know two things:

Is there any way to write the ajax result in the fiddle as a file directly to the disk (without any type of prompt). Like to the user's desktop for example.
Is blob the most suitable format for this?

http://jsfiddle.net/FBGDe/

var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function(){
    if (this.readyState == 4 && this.status == 200){
        console.log(this.response, typeof this.response);
        var img = document.getElementById('img');
        var url = window.URL = window.webkitURL;
        img.src = url.createObjectURL(this.response);
    }
}
xhr.open('GET', 'http://www.newyorker.com/online/blogs/photobooth
                                                       /NASAEarth-01.jpg');
xhr.responseType = 'blob';
xhr.send();

Please note that Filesystem API is no longer part of the standard's specification, as specified at: http://www.w3.org/TR/file-system-api/

EDIT: Quoting the specification in case the link changes: "File API: Directories and System W3C Working Group Note 24 April 2014

Work on this document has been discontinued and it should not be referenced or used as a basis for implementation."

(This does not relate to the question directly, but it is essential to know not to use the FileSystem API further.)

Another link: http://www.html5rocks.com/en/tutorials/file/filesystem/

"In April 2014, it was announced on public-webapps that the Filesystem API spec should be considered dead. Other browsers have showed little interest in implementing it."

Unfortunately, writing to regular files is not currently possible (despite the accepted answer Modifying Local Files Using HTML5 and JavaScript).

You can only write to the sandboxed filesystem.

FYI, you can do this in a Chrome Packaged App: http://developer.chrome.com/apps/fileSystem.html But even then the user must at least choose the file first. Writing to any file would be a serious security hole.

What problem are you really trying to solve?

Writing file to desktop using HTML5 FileSystem API

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