CDSEO Pro for X-Cart creates .html urls that serve dynamic php content, essentially creating fake static html pages that update dynamically when users login, add to cart, etc.. Some of our users have previously expressed concern that using .html pages that serve php could be seen as trickery and cause issues with Google. Our response has always been that Google does not know if your x-cart pages are served as html or php so your x-cart seo rankings will only be affected positively by the new x-cart search engine friendly urls.

Matt Cutts of Google fame, while recently addressing a question about Cloud hosting, also commented on this issue:

"We don't know what is happening on the side of your web server. Your web server could be running Perl, PHP, Python, or Ruby on Rails. All we know is what the web server returns. ... We don't even know whether a page is dynamically created or statically created. All we know is what the web server sends back."