See this article for possible help:

INFO: Executing Files by Hyperlink and the File Download Dialog Box
http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q232077

-- 

Jon R. Kennedy
Charlotte, NC, USA
jkennedy2@c...

"Jim Spiller" <jim@_criticaltools-remove-.com> wrote in message 
news:eNISthMUFHA.3544@T......
> Our Windows application registers the filetype ".xyz" so that 
> doubleclicking
> in Windows automatically starts our app and opens the data file within our
> app. This all works great using Windows...
>
> The filetype is an XML-based text file and not a binary file which seems 
> to
> cause problems when trying to use a Browser to open the file. If we create 
> a
> link in a Browser to the file "test.xyz" it displays the XML text within 
> the
> browser instead of starting our application and displaying the file.
>
> We have experimented with setting "Content Type" but nothing seems to tell
> the browser that filetype ".xyz" is associated with our app. It 
> consistently
> displays the XML text in the browser.
>
> Is there a way to tell the browser that the file in a link is associated
> with our app? In the registry perhaps. We would prefer not to have to tell
> each user to set this on the server side of things.
>
> Thanks!
>
>
>