IIS6 + httphandlers + 404 error

Hi,
We recently moved from IIS5 to IIS6. I am running a ASP.net 1.1 web app.

in the web.config file for the app there is the following entry under httphandlers:

<add verb="*" path="*.ads" type="Snippets.Publishing.Adverts.AdvertClickHandler,Snippets.Publishing.Adverts" />
<add verb="GET,HEAD" path="*.jpg,*.gif,*.swf,*.pdf,*.css,*.htm,*.js,*.doc,*.mp3,*.zip,*.ico,*.txt" type="System.Web.StaticFileHandler" />
<add verb="*" path="*.asp" type="System.Web.HttpForbiddenHandler" />

My problem is:
The ".ads" extension always returns a 404.2 error.

I have so far done the following:
1. Registered .ads in the MIME Types as application/octet-stream.

2. added the .ads extension to the web Application Config for the web app, with the exectuable path pointing to: C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\aspnet_isapi.dll with ALL verbs allowed.

Is there something i need to add to web services extension node? This is the only thing I can see that is different from IIS5 to IIS6.

Any help would be appreciated,

Regards

Matt

Sorry, I don't have IIS6 and don't use web services, I don't have any help on this subject.