page urls ending in htm?

[eluser]andychurchill[/eluser]
I'm porting an existing website to the codeigniter framework, so it already has page urls indexed and ranked on google. for that reason, I want to try and keep those existing urls working, and not have to create new urls for the new pages.

So far, for example, I've got controllers and a htaccess file that converts:

http://www.mydomain.com/index.php/somecontroller into http:// www.mydomain.com/somecontroller, but ideally I now need it to appear to be a page like http:// www.mydomain.com/somecontroller.htm?

Is this possible?