recently (last three weeks) I started to get the following alert whenever I open a .pps attachment.

"C:\docume~1\peter\locals~1\temp\ty4lvgk1.pps could not be saved, because the source file could not be read. Try again later or contact the server administrator."

This is followed by the pop up asking what program to use to open the attachment. I click on Power Point and ok the alert message and the attachment displays normally.

Anyone have any idea what the alert means?