php in html part 2

I have a customer that has been running php inside html documents just fine with a .htaccess file consisting of the following:
AddType application/x-httpd-php .php .php3 .phtml .html .htm .php4 .css

All of a sudden this method has just stoped working. We have not made any changes to the server since it stopped working. Does anyone have any idea what may be causing this to happen?

 

 

 

 

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