title: A registered tlb file on Windows 7 (64bit) isn't usable
body: <p>I have a (VS 2008) C# project that needs to use a 3rd-party COM object. For that, I'm told, I need to register the COM objects's tlb file. So I do </p>
  
  <pre>
  C:\Windows\Microsoft.NET\Framework64\v4.0.30319\regtlibv12.exe blahblah.tlb
  </pre>
  
  <p>which gives me </p>
  
  <pre>
  Registration of FREngine.tlb successful.
  </pre>
  
  <p>But then I can't add a reference to it in the C# project, because it the type lib isn't available on the "Add Reference" dialog's COM tab. Sure enough, a registry search for <code>blahblah</code> comes up empty. </p>
  
  <p>Anyone out there any idea what should I be poking at next? </p>