[Xitami] php not working

[leegold]

PHP is not working.  I have the file:

<html>
<body>
<?php echo "Hello World"; ?>
</body>
</html>

I see a blank web page not "Hello World".

There's something very simple I'm not understanding or not doing(?)
I have a feeling something obvious I'm not doing. Win2k, xitami 2.5b2


Lee