View file files/lib/.htaccess
<FilesMatch "\.(php|php3|php4|php5|php6|php7|html|html|xhtml)$"> DefaultType none ForceType text/plain </FilesMatch>
<FilesMatch "\.(php|php3|php4|php5|php6|php7|html|html|xhtml)$"> DefaultType none ForceType text/plain </FilesMatch>