IIS7 - Default document in another (virtual) directory

Question

I have a Website that has a cgi-bin (virtual) directory.

I want when someone comes to the site

http://www.domain.com/

they are automatically brought to

http://www.domain.com/cgi-bin/site.exe.

I would like to do this without META Redirect if possible. Can this be configured in IIS7? I know in IIS6, I could specify the default document as:

/cgi-bin/site.exe

and that used to work ok. Apparently, not in IIS7...

Please advise!