copy png from assetbundle into another folder

Is it possible to copy a png from an assetbundle into another folder or directory?

I know how to copy a file using the IO commands but not when it involves an assetbundle. How would I change this code to deal with the bundle. Or is there an easier way?

 import System.IO;
     function getandcopyPropFile(){
     var download : WWW;
     var propbytes:byte[];
     var url = "http://www.someurl.com/info.txt";
     download = new WWW (url);
     yield download;
     propbytes=download.bytes;
     Debug.Log(download.data);
       File.WriteAllBytes(Application.streamingAssetsPath + "/propinfo.txt", propbytes);
 
         
     }