Thanks for your quick response Dave,

Well, I understand what you're doing is actually somewhat like url resource
redirecting, redirect one kind of url to another kind of resource, correct?

I assumed that you've correctly configured the IIS server so that the url
to a non-existing document will also be forward to aspnet engine.  Then, in
ASP.NET side, you can consider use httpmodule to do the redirecting work.
You can check the original url of the request and determine what to do
next, you can:

1. You can call method to creating temp file and use Rewrite API to
redirect the request context to the new created file.

or

2. you can even directly write our binary stream into the response stream
an close the response.

Here are some articles on ASP.NET url rewriting and httpmodule:

#URL Rewriting in ASP.NET
http://msdn.microsoft.com/library/en-us/dnaspp/html/urlrewriting.asp?frame=t
rue

#How to: Create and Configure an HTTP Module  
http://msdn2.microsoft.com/en-us/library/tfd6k449.aspx

Also, the below article is a good one for getting the underlying
architecture of the ASP.NET (from IIS to ASP.NET pipeline):

#A low-level Look at the ASP.NET Architecture
http://www.west-wind.com/presentations/howaspnetworks/howaspnetworks.asp

Hope this helps.

Regards,

Steven Cheng
Microsoft Online Community Support

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