1. I did some research on it a couple years ago now I guess, all of
what I found has disappeared from my head pretty much, but I don't
think it was a BHO, hopefully I would have remembered (but there are
so many other more important things I've forgotten [I guess] that this
is not certain)

2. MS would want it to open Infopath even if IE wasn't the default
application for opening files of type xmlfile. As an example, if
XMLSPY is installed will a BHO still do this?

Cheers,
Bryan Rasmussen

> From: bryan rasmussen [mailto:rasmussen.bryan@xxxxxxxxx]
> Sent: 25 January, 2007 06:10
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: Re:  XSLT 2.0 in the browser
>
> Although actually now that I remember there is an addition of
> PI filtering somewhere in Windows, settable via the registry,
> because infopath came with the ability to open XML files that
> had been written by an office application in the correct
> version of Office. This however will still only work in IE
> but it will also work in any XML File opened from the Windows
> Shell, i.e. Explorer.
>
> I doubt that is on the mime type since Windows doesn't really
> do mime types, it does extensions and filetypes. so it was
> probably the addition of a dll to handling files of type
> XMLFile to the registry.

I have a strong suspicion that the PI filtering in IE is done
with a BHO (Browser Helper Object).  Appropriate documentation
can be found on msdn.microsoft.com.  You could probably also
implement a Saxon XSL transform, instead of the default MSXML
transform with a BHO.

Andy.