title: Windows installer for office add in
body: <p>I created s set up project using <a href="http://msdn.microsoft.com/en-us/library/ff937654.aspx" rel="nofollow noreferrer">this link</a>.</p>
  
  <p>The addin was not getting installed. When I tried to add it through add ins in excel it said <code>"xxx is not a valid office addin".</code> </p>
  
  <p>This error is because the dll is not strong named and not in GAC. So I enabled adding the dll in GAC in the set up project using <a href="http://support.microsoft.com/?scid=kb;en-us;324168&amp;x=9&amp;y=14" rel="nofollow noreferrer">this link</a></p>
  
  <p>I am still not able to see the add in when I run the set up. and when I forcibly tried to add it, got the same error.</p>
  
  <p>Any idea whats going wrong?
  Thanks in advance!</p>
  
  <p><strong>Update:</strong> Added the registry entry in the deployment project</p>
  
  <p><img src="https://i.stack.imgur.com/eJ8PN.png" alt="enter image description here"></p>