Hi, Suppose I have http://www.site.com/dir with PR5. Now what if I change inside /dir from index.htm to index.php, I know that going to http://www.site.com/dir will still have same PR. But will it loose it's PR over time since it's index.php and not index.htm anymore? Thanks. Andre
Yes it will! the new .php is a new page for the search engines and will need some time to get PR assigned.
Rewrite site.com/dir/index.php to just site.com/dir using .htaccess with a 301 redirect. You will retain the PR page, but you should do this regardless of PR so you don't have 2 URL's for the one document.
I had the same issue long ago , on http://website/index.html to http://website/index.php you will loose your pr as its a new page , but on http://website/ you will not .