I noticed that Google.com is listing pages on my site which don't exist. When I type my site name into Google and view all results from my domain, I get a whole list of pages with no description:

There are about 30 entries like this, it appears that it is indexing common URLs used in phpNuke, but I'm not sure. Do you think this could be because I use a similar format to phpNuke for my modules? I.E. a module is called as modules.php?mod_name=ExampleMod which is just like phpNuke. But that's IT.

If this is the case, would this mean Google is trying to guess what CMS my site is using? This is a look into the engine's methodology in a way.