How to make IIS ignore 404 errors?

Yes. I added a text file with the name Default.dh, and the module handles it. It doesn't seems to handle stuff which isn't there, which means the module is only called whenever ASP.NET doesn't encounter errors. Is there a way to avoid this?

Also, whenever I have a sub which is executed at the begin of the request, and peform this code

HttpContext.Current.Response.ContentType = "text/html"

HttpContext.Current.Response.Write("Request GUID = " & Guid.NewGuid.ToString & " <br><br>")

It still displays the Default.dh file as a text file, rather than a HTML page.

EDIT It might be the cache.
EDIT2 But it wasn't =|

<httpModules>

<add type="Root.Components.Security.HttpModule.HttpModule,den Heijer" name="HttpModule" />

</httpModules>

den Heijer.dll is the ouput

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