As I mentioned in your other post, you can add the following to your .htaccess file within the 'widgets' directory:
<pre class="ip-ubbcode-code-pre">RewriteEngine on
RewriteRule ^(.*).html$ $1.php</pre>
This will automatically redirect all requests for *.html to *.php on the server side. This means that all traffic from search engines will be redirected to the correct page.