If you're using PowerPoint Viewer version 2003 or 2007, see:
Unable to open .PPS attachments directly from Windows Mail in Windows Vista:
http://www.winhelponline.com/articles/149/1/
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Regards,
Ramesh Srinivasan, Microsoft MVP [Windows Shell/User]
Windows® Troubleshooting
http://www.winhelponline.com
I can't open atach. .pps and .ppt The others i can open.
When i place them in a folder, i can open them too.
Groeten
Steemans August
I had the same problem.Followed the automatic fix and now the files open fine.