Mystery php in html site

where is it coming from?

[texasville]

I have a site I built for a client that is not doing well at all in the search engines and I was poking around in yahoo site explorer and found some mystery pages. This is a 38 page site all in html. No PHP scripting at all. But site explorer has pages listed such as http://www.example.com/?spg=freereports.php .
There are about a half dozen of these and tehy all resolve to the index page. I have a severe dup content problem going on. Anyone got a clue as to what I have inadvertantly done? We have several different types of contact forms that are used in frames pages. We do have jscript on them to insure the visitor fills out required info and such but no php.

[WesleyC]

Look in your server manager (IIS or Apache) and check if your HTML pages are set to be parsed with PHP.

If they are, you'll need to do a 301 redirect on any URL with a? to the page in question to avoid duplicate content issues of this nature.

[edited by: WesleyC at 8:50 pm (utc) on Aug. 8, 2007]

[texasville]

I have looked through everything I am allowed to in the control panel. PHP is set to off. Could you be more specific as to where to look? And how would I write the 301 to redirect these spurious urls. I would just as soon 404 them or any php.