You will just need to tweak the client MIME settings to achieve this, there 
is no way that you can do it from the server side without sending a Content 
Type that is not PDF, which would not achieve what you require.

At 15:00 12/10/01 +0000, you wrote:
>Hi
>
>I have a collection of documents stored on a network share, which are all
>PDFs. The collection contains an index (.pdx) file to allow searching of
>the entire set of documents.
>
>I need to allow access to this feature through our Intranet, and
>unfortunately (for this situation only) everyone has the Acrobat browser
>integration enabled. As you'll know, this opens the docs within IE and
>disables the Global search button/functionality.
>
>Is there a way I can make a link in an HTML page force the PDF to open in
>Acrobat Reader 4.0 externally to the browser?
>
>At the moment i'm having to include a .lnk shortcut file in the HTML page
>to allow each user to download the shortcut to their desktop.
>
>Hope someone can help as i've found nothing of use on the web.
>
>Burns