ASP.NET/IIS: 404 for all file types

Question

I set up 404 handler page in web.config, but it works ONLY when extension of URL is .aspx (or other which is handled by ASP.NET). I know I can setup static HTML page in webs

Answer 1

For information:

This is one of the several nice things that IIS7 brings - all pages are routed through the handler such that you can do custom 404s and - usefully - directory and file level security for any file (based on the same web.config stuff as for asp.net files prior to IIS7).

So notionally "use II7" is an answer (will be "the" answer in time) - but of course its not a terribly practical one if you're not hosting/being hosted on W2k8 (or higher).