Open a document through FileSystem

Question

Hello guys,
I'm building an HTML5 extension for Photoshop that will serve as a version control for your PSD files. It will soon be avaliable in GitHub =)
The thing is, when the user click on a previous version, the extension should open that version as a new document in Photoshop.
Since Photoshop's API can only open files that exists on the disk (at least that is what i found out), i tried to use FileSystem and FileWriter to retrieve the data from the web and write it into a new PSD on the user's local disk.
Whoever, when i try to get the path from the file i just created (using fileEntry.fullPath), it returns me a path from inside the sandbox (quite a lot of googling told me that's the way things works when writing files from javascript). Then, Photoshop can't find the file.
What should i do?
I am using Photoshop CC, Eclipse, Mac OSX 10.7.5.
The code on my JS is that:
window.requestFileSystem(window.TEMPORARY,1024*1024*1024,onInitFs,errorHandler);
function on InitFs(fs){
     fs.root.getFile('tempVersion.psd',{create:true,exclusive:true},function(fileEntry){
          fileEntry.createWriter(function(fileWriter){
               fileWriter.onwriteend = function(e){
                    new CSInterface().evalScript("$._ext_PHXS,openDocument('"+fileEntry.fullPath+"')");
               var blob = new Blob([toWriteData]);
               //the toWriteData is an Uint8Array of the original PSD file.
               fileWriter.write(blob);
          },errorHandler);
     },errorHandler);
And my jsx it's like that:
openDocument : function(file){
     app.open(File(file));
Thanks for your time!

Answer 1

Hi,
You can manipulate local file with CEPEngine extension libreries, can download below:
http://forums.adobe.com/message/5894888#5894888
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