When I try to view my ASP Application with Firefox, specifying the address

"http://localhost", I am presented with a popup window saying "You have chosen to open an application/octet-stream from http://localhost. What should Firefox do with this file? Open with (browse) Save to disk. (ok)(cancel)"

Strangely, if I specify that I want it to open "http://localhost/index.aspx" it displays the page without a problem.

Internet Explorer does not exhibit this problem. Is IIS serving the pages in a way that makes them ambiguous to Mozilla but acceptable to IE6? How can I correct this problem?

Thanks in advance for your help

This problem has solved itself.
I know not why!
Mystery.

You can check the IIS config to see if index.aspx in one of the default pages it will load. I think it should be set up this way when you install asp.net.