Add .html to this php directive in php.ini

1)search for this in php.ini
AddType application/x-httpd-php

2) .html at the end of the line like this

AddType application/x-httpd-php .php .html

if you want htm page to run add .htm ..
AddType application/x-httpd-php .php .html .htm

3)restart Apache...

If you are not having access to php.ini.. put it line 2 in .htacess
file and place it in your webroot...

Hope this s..

Thanks,
sharma