What is the mime type for ashx

I am trying to move a legacy app to iis7. I have found hundreds of posts on how to setup mime types, but not one on what exaclty the mime type for .ashx is.

Also, I don't understand how aspx is being served by iis7 and it does not list it as a mime type. I check the iis6 box the legacy code is coming from (where it works), and there is not one single mime type listed at all.