http://support.microsoft.com/?kbid=828041

SUMMARY
Microsoft has released an update for Microsoft Office 2003. This update fixes a problem that occurs when you try to open or to save a Microsoft Office PowerPoint 2003 file, a Microsoft Office Word 2003 file, or a Microsoft Office Excel 2003 file that includes an OfficeArt shape that was previously modified and saved in an earlier version of Microsoft Office. When a PowerPoint 2003 file, a Word 2003 file, or a Excel 2003 file is opened in an earlier version of Office, empty "complex" properties may be introduced into the file and a bit may be changed in the file record that describes these properties. Earlier version of Office will ignore this bit value but when this bit value is detected in Office 2003, you may experience the following symptoms:

• The document may not open completely.
• The document may be corrupted.
• The document may open but with missing content.
• You might receive an error message.

When you open a PowerPoint presentation in PowerPoint 2003, you may receive one of the following error messages where filename is the name of the file that you are trying to open:

• PowerPoint can't read filename.
• PowerPoint can't open filename because part of file is missing.
• PowerPoint can't open the type of file represented by filename.

When you open a PowerPoint presentation in PowerPoint Viewer 2003, you may receive the following error message where filename is the name of the file that you are trying to open:

PowerPoint Viewer cannot open the file filename because the file is corrupted.

Note Although these symptoms appear when you use the PowerPoint 2003 Viewer, the critical update should not be installed unless both Office 2003 and PowerPoint 2003 2003 are also installed, as this update will not correct the issue in the viewer. In this situation, the workaround is to use the PowerPoint 97 Viewer because this should only affect presentations that are saved in PowerPoint 97 and PowerPoint 2000 and those presentations do not require the new viewer.