What i mean is this:

 I want to access the file at www.mywebsite.com/aboutus.aspx as www.mywebsite.com/aboutus

 I want to remove the extension of ".aspx" so it looks like your going to a folder (I'm using this for marketing purposes and to make the url more user friendly).  I am able to do this on our test server but for some reason on the production server, this cannot be done.  Where is the setting for this?

 I can't use iFinity or any url handler moduls as we have server side stuff we do and it completely fubars them.  I found a solution that uses the web.config, but that crashes the site so I cannot use it.  It's wierd because our test server works just fine when removing the .aspx but the actual website doesn't.  Very wierd.