PowerPoint 2003 opens PowerPoint 2007 file with a new name and read-only

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.

Thank you.

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Tom163Author Commented:
Ok, the version of the compatibility pack is 12.0.4518.1014.  Trusted Locations is not enabled.  I have not received information yet on all the security patches that are installed.
Did the PCS in question upgrade to Office 2003 from Office 2000?  See: http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Windows/XP/Q_23250851.html

Try opening PowerPoint and clicking on Help, Detect and Repair to fix file associations.  Then click Help, check for Updates.
Tom163Author Commented:
GlennaShaw, the other post does mention the same symptoms, and the repair you mentioned may have fixed the issue, however after extensive testing we found that the computers being affected had not installed patch MS08-051.  It was found that these computers had a windows installer or another issue.  When that issue was fixed and MS08-051 was installed the originall issue disappeared.  The filetype was checked before and after in a lab environment and we found that the 'open' action in the pptx filetype was associated with "c:\program files\microsoft office\office12\moc.exe" before applying the patch rather than the PowerPoint 2003 executable.  After MS08-051 was installed, the filetype then correctly associated with "c:\program files\microsoft office\office11\PowerPnt.exe".  I looked at the bulletin for MS08-051 but it doesn't mention changing a filetype so I'm at a loss as to why that seems to work.  

In any case, fixing the windows installer issue and allowing MS08-051 to install ends up resolving this issue so this question can be closed.

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