Changing a File Association, Repairing broken File Associations

Problem
You doubleclick a document file and the wrong program opens, or the file opens in an incorrect mode (ie, a PowerPoint Show file opens in PowerPoint Edit mode), or your PowerPoint files have the wrong icon. Or you get a message explaining something about how Windows doesn't know what to do with this type of file.

Resolution
Problems viewing PPT/PPS files in Outlook/Outlook Express
If you're trying to view a PPT or PPS file you received as an email attachment in Outlook or Outlook Express AND you have the free PowerPoint 2003 Viewer (but not PowerPoint) installed AND you have Windows XP SP2 (or higher) and see a message like

"This file does not have a program associated with it for performing this
action. Create an association in the Folder Options control panel."

This can occur if you're using Outlook Express under Windows XP Service Pack 2 and…

Source--Changing a File Association, Repairing broken File Associations

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