The handler used may be slightly different.
I would recommend skipping the PHP file as a last resort, as this can be solved with less effort, which is one brute force method.
Listed below are some of the more common options, but there may be more.
AddType application/x-httpd-php AddType application/x-httpd-php5 AddHandler application/x-httpd-php AddHandler application/x-httpd-php5
As already mentioned, a combination of AddType and AddHandler may be required.
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