我可以将Expression Web 4的预览窗格用于<？php include ...？>指令吗？

I have a website that uses a global header.inc file, containing the header I want on top of every HTML page:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <meta http-equiv="Content-Language" content="de-at" />
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

  <link rel="stylesheet" type="text/css" href="standard.css.php" />
  ...etc...

Hence, the pages themselves look like this:

<?php include "header.inc"; ?>
  <title>Page Title</title>
  <style type="text/css">
    /* additional style sheets for only this page */
  </style>
</head>

<body>
  ...

Obviously, Expression Web complains about the unopened </head> tag and ignores the stuff present in the header file (e.g., the stylesheet), which makes the preview pane rather useless.

Since EW4 is supposed to "work nicely" with PHP, is there some way to make the preview pane honor includes? I've told EW where it can find the php-cgi.exe, so in the browser preview everything works nicely.