title: Unpacking rar on iPhone
body: <p>I created little download application with music player and now I want it to unpack archives, because quite often mp3s are packed in archive and you can play them before you unpack the archive.
  I found solution for .zip files on iPhone here on stackoverflow, but I'm wondering if there's a way to unpack .rar files, or other than .zip formats.. Many times, I red about creating own utility to do this, but I don't know whether I am able to create it or not. 
  Could you please tell me if there's any solution for unpacking .rar(or simply other than .zip) archives on iPhone?
  Thanks</p>