title: How do I add the “extended attributes” on a file in Mac OS X?
body: <p>How do I add the extended attributes?</p>
  
  <p>I am using excel with local file links and opening files but I need to add extended attributes to each file. So I do not get the prompt <code>Grand File Access</code>.</p>
  
  <p>My files looks like File-01.html...File-99.html.</p>
  
  <p>I need to add the xattr <code>com.apple.quarantine: 0002;580fbaf1;Microsoft Excel;</code> to every *.html file. How can I do that? </p>