title: Internet Explorer serves up unknown file type
body: <p>I have a web server on port 80 and port 81. IE can connect to the server on either port. This worked fine until I installed an application with a file type (.TPJ) that had a MIME type of text/xml on the client PC. At that point IE no longer opened the web site, but offered to download a file <em>serverName.TPJ</em>. The file contained the correct information from the web site.</p>
  
  <p>I changed the installer for the application so it didn't register the MIME type. Now IE on the client PC offers to download a file with unknown file type. Note that the application has never been installed on the server PC.</p>
  
  <p>The problem occurs with IE7. It doesn't occur with Firefox, Safari, or Chrome.</p>
  
  <p>Does anyone know how to work around this?</p>