title: How to load/import dll with MEF out of metro app?
body: <p>I've trying to write a extendable metro app using MEF. I got it working with a local extension (inside of the current assembly). Now I want to load a external dll. The <code>DirectoryCatalog</code> seems to be not present in .net 4.5. So I tried to use <code>ApplicationCatalog</code> but I got the following error while calling <code>SatisfyImportsOnce</code>: <code>Assembly.LoadFrom is not supported in AppX.</code>.</p>
  
  <p>Here's me code:</p>
  
  <pre><code>var catalog = new AssemblyCatalog(GetType().GetTypeInfo().Assembly);
  ApplicationCatalog catApp = new ApplicationCatalog();
  AggregateCatalog cat = new AggregateCatalog(catalog, catApp);
  _compositionService = cat.CreateCompositionService();
  _compositionService.SatisfyImportsOnce(this);
  </code></pre>
  
  <p>Any suggestions what's going wrong?</p>
  
  <p>I've placed the dll in the Appx directory and run VS11 Beta as administrator.</p>