828041 - Overview of the Office 2003 Critical Update: November 4, 2003:
"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.
When you open a Word document in Word 2003, you may receive the following error message:

Word experienced an error trying to open the file. Try these suggestions.

* Check the file permissions for the document or drive.
* Make sure there is sufficient free memory and disk space.
* Open the file with the Text Recovery converter.
Additionally, when you open the document in an Office 2003 program, you may receive one of the following error messages where filename is the name of your Office file:

Do you want to save the changes you made to filename?

There is insufficient memory. Save the document now.

filename is read-only. Do you want to save changes to a different file name?
This update is part of the continued attempt by Microsoft to provide the latest product updates to customers.

This article describes how to download and install Office 2003 Critical Update: KB828041.

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