korkus2000 - 5:33 pm on Aug 19, 2002 (gmt 0) <added>
You are not considering a lot of .htm pages that are added to the IIS and are really asp pages. I have seen a growing trend of asp developers doing this to hide from bots and others whats really driving the page. I also think huge sites like amazon and msn are driving up the asp number. I am not sure how you can get a true stat on the matter except website by website instead of pages indexed by Google.
In fact here is a thread about htm asp pages going on right now.