When you double-click a PowerPoint 2007 file (PPTX) it opens in PowerPoint 2003 with a new file name that is different than the one you clicked and as read-only. An example of the filename is Ppt0000006.pptx. There are no prompts for a password or a dialog box that recommends that you open it read only. The file can be in the user's My Documents folder or C:\Data. The issue started after the installation of critical MS update MS08-067, but the update itself isn't the root cause because this issue doesn't occur on all PCs that have received the update.
Here is the configuration of the PCs:
OS: Windows XP Professional SP2
Software: Office 2003 Standard, Compatibility Pack for the 2007 Office System
I've looked at similar issues here on the website, but none have a solution or provide root cause. One theory I have is that it might have something to do with Trusted Locations.
If anyone knows the solution please provide it. In the mean time I am attempting to get more details on the SP level of the Compatibility Pack and Office and security updates that are installed and whether Trusted Locations are enabled.