Wordpress Two

I have a wordpress website which came with an xmlrpc.php file. I'm writing some cache-controls for different files. My understanding is that with wordpress the files of the txt of different pages withing a wordpress website are .php files. Obviouslu xmplrpc.php is also a .php file. If I set cache control for .php files (to xpiration for text short) won't the cache controlling advrsely affect the xmlrpc.php file? In other words in