When you attempt to open a Microsoft PowerPoint presentation (that was created in Microsoft PowerPoint 2002 or in a later version of PowerPoint) in an earlier version of PowerPoint, the file is not opened as expected. Additionally, you may receive an error message that resembles one of the following error messages:
PowerPoint can't open the type of file represented by path/filename.
PowerPoint can't read path/filename.
Note The following actions only apply to Office 2007 products.To determine the unique number that is associated with the message that you receive, press CTRL+SHIFT+I. One of the following numbers appears in the lower-right corner of this message: 400010
400011
Note If you are sure that the presentation was not created or edited in Microsoft Office PowerPoint 2007, in Microsoft Office PowerPoint 2003, or PowerPoint 2002, your presentation is likely to be damaged. In this case, this article does not apply to your situation. For more information, click the following article number to view the article in the Microsoft Knowledge Base: