Page is a not externally linkable
-- Google SEO News and Discussion
---- Are page extensions important to Google?
g1smd - 1:05 pm on Sep 12, 2011 (gmt 0)Thread source:: http://www.webmasterworld.com/google/4361209.htm
Go for extensionless URLs for at least your dynamic pages. It makes URL rewriting a lot easier.
Categories, mimicing folders, will always be extensionless.
Brought to you by WebmasterWorld: http://www.webmasterworld.com