title: How does Windows link HTML files to folders?
body: <p>Almost every time you save a web page from a web browser to your local computer a <em>PAGENAME.html</em> (or .htm) file is created and a folder named 'PAGENAME_files' that contains resources specific to that page.</p>
  <p>If you copy/move/delete either the folder or the .html file Windows automatically does the same operation the other file as well.</p>
  <p>This behaviour also happens if you create a file named <em>1.html</em> and a folder called <em>1_files</em>.</p>
  <p>How does this link happen? And <em>why</em> does it work only with web files?</p>