android serialization weird path issue " IsolatedStorageException ", javascript

Hello , i've been struggling with this for days evertyhings works fine on pc but it returns an error on the android device , "IsolatedStorageException " Could not find a part of the path i've been looking for a solution on the forums with no luck , seams like this android serialization subject is not really well covered , well i hope someone can help me with this

  // save function
     public function Save(){
  
          
         var MySerializer :XmlSerializer = new XmlSerializer(typeof(Data) );
         MyData.SavedHealth =Health;
         var MySaveFile :FileStream = new FileStream( Application.streamingAssetsPath+ "/Data.xml",FileMode.OpenOrCreate);
         MySerializer.Serialize(MySaveFile,MyData);
   
     
         MySaveFile.Close();
           
     }
         // Open function
     public function Open()
     {
  
         var MySerializer :XmlSerializer= new XmlSerializer(typeof(Data));
  
  
   
         if(File.Exists( Application.streamingAssetsPath+"/Data.xml" ) ){ 
 
  
             Debug.Log("File Exits");
 
             var linkstream : WWW  ;
 
             if(Application.platform==RuntimePlatform.WindowsEditor)
             linkstream = new WWW("file://"+Application.streamingAssetsPath+"/Data.xml" );
             else if(Application.platform==RuntimePlatform.Android)
                 linkstream = new WWW("file://"+ Application.streamingAssetsPath + "/Data.xml" );
 
 
             while ( ! linkstream.isDone) {}
             
    
             var  RealRootFolder : String = Application.persistentDataPath+"/Data.xml"  ;
 
             File.WriteAllBytes(RealRootFolder, linkstream.bytes);
             var MySaveFile :FileStream = File.Open(RealRootFolder,FileMode.Open); 
  
             
             MyData= MySerializer.Deserialize(MySaveFile) as Data;
             MySaveFile.Close();
  
             Health =MyData.SavedHealth ;
  
 
 
         }