I got it working. The files are located in two places: \wamp\bin\apache\apache2.2.22\bin and \wamp\bin\php\php5.3.13. Putting the two in the apache folder into the Windows path didn't seem to work, so I put the php5.3.13 into the path and rebooted the server and that seemed to work.
Although, in hindsight, I may have just needed to restart the server.
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