search engines ignoring .php3 pages

I know there has been a lot of talk about search engines and php pages but what is the latest consensus on php pages being ignored by search engines? Has anyone found this to be true: "Though each engine categorizes a site's content according its own unique algorithms, all search engines share the same flaw. They cannot handle dynamically loading pages, such as the ".php3" front door to your site, and will ignore links placed on such default pages." This is what a search engine placement company is claiming. Charles