Using a .htm to run .aspx programming

I need some help to point my programmer. I have a lot of .htm, .asp, and .aspx pages as my website progressed. I require some features on my website such as server side includes, and shopping cart features integrated into the shell of the website.

As the site owner and a firm believer in SEO I feel that renaming page.htm into page.aspx would kill the search engine ranking fo that page. What is the technique or is it possible to keep the .htm and .asp extentions but run asp.net technology on it?

 

If you used a 301 redirect from the old file to the ASPX version then you wouldn't lose any SEO and would have consistant file names across the whole site.

If you want to go down the other route then you will need to check which version of IIS your server is running. Assuming its v7 or later then read http://learn.iis.net/page.aspx/508/wildcard-script-mapping-and-iis-7-integrated-pipeline/