Try this fix:
http://www.winhelponline.com/article...ows-Vista.html
--
Gary VanderMolen, MS-MVP (WLMail)
"RaeWeniger" <RaeWeniger@xxxxxx> wrote in message news:3DCB132C-868F-40C2-80DF-7076225CDA71@xxxxxx
Quote:
> When I try to open a .pps file attached to an email message in Windows Mail
> the following error message is returned: "*.pps is not a valid Win32
> application" I am using Windows Powerpoint Viewer 2007, and if the file is
> saved to the hard drive, I can open it just fine by launching the viewer and
> searching through the many pps files.....but I want to open attachments from
> Windows Mail!!!