Here you go, Portman:

Registering Preview Handlers:
http://msdn2.microsoft.com/en-gb/library/aa969369.aspx

The plain-text preview handler GUID is {1531d583-8375-4d3f-b5fb-d23bbd169f22}

--
Regards,

Ramesh Srinivasan, Microsoft MVP [Windows XP Shell/User]
Windows® XP Troubleshooting http://www.winhelponline.com


"Portman" <Portman@discussions.microsoft.com> wrote in message news:126507FE-87DC-4EE7-9E4C-5C0582CA1760@microsoft.com...
I'm not interested in changing what program is used to _open_ the file. The
extensions are all registered with their appropriate programs (Visual Studio,
SSMS, etc).

I want to register how Windows "previews" the files in the Preview Pane.

"BurrWalnut" wrote:

> Control Panel, Default Programs, 'Associate........'
>
> "Portman" wrote:
>
> > I like the idea of the integrated Preview Pane. It's great for text files, so
> > that you don't need to open Notepad to read every file in a directory.
> >
> > I would like to "register" many other file types with the same preview
> > handler. For instance, *.sql, *.cs, *.aspx .... however, I can't for the life
> > of me figure out how I can associate extensions with preview handlers in
> > Vista.
> >
> > Anyone know how?