CGI code in Server Side Include page

Experts,

I have a page, index.shtml with the following server side include:

<!--#include virtual="helloworld.cgi" -->

This should simply output, "Hello World" to the browser.  What I get is:

print "Hello World";

....displayed in the browser.  So I think that the server is not parsing this correctly.  I've checked the MIME types and CGI is enabled, and works on it's own, just not within shtml pages.

please help!