Heh, I'm trying to do the same!!
Anyway, what I do know, is that you compile PHP as a cgi (not the script). And this means rather than running as an apache mod, when you execute a .php file, it works like perl, and just runs it through php.exe. This means it'll run through Cron (it won't otherwise, since Cron doesn't know it needs Apache).
AFAIK, you may have to remove the <?php tags (not too sure bout that), and you may need to put "#!/usr/bin/php" at the top of the script.
HTH