Microsoft's Own Recovering Corrupt PowerPoint Files Advice

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http://office.microsoft.com/en-us/powerpoint-help/recover-a-corrupt-powerpoint-file-HA001116878.aspx  - "This article is excerpted from "Recovering a corrupt PowerPoint file," by Echo Swinford. For the complete text of the article, see EchosVoice.

You’ve worked hard on your presentation, but when you try to open it, you receive an error message, “PowerPoint cannot open the type of file represented byfilename.ppt.” This is the classic sign of a corrupt presentation, but don’t panic yet—you may be able to get at least some of the file back.

IS IT A PASSWORD-PROTECTED FILE?

Before you determine that your file is indeed corrupt, first find out if a password was added to it in PowerPoint 2002 (also known as PowerPoint XP) or PowerPoint 2003. If the file does have a password and you are trying to open it by using a previous version of PowerPoint, you will receive this error. Ask the person who created the file to resave it without the password, or use the PowerPoint 2003 Viewer to view the presentation.

WAS THE FILE SENT TO YOU AS AN E-MAIL ATTACHMENT?

If you received the file as an e-mail attachment, it may have become corrupted as it traveled through cyberspace. Ask the sender to zip the file by using Microsoft Windows® XP’s built-in zip function or a program such as WinZip, and then resend. Or have them upload the file to a File Transfer Protocol..."