Upgrade to MS Office 2003 Locks Older File Types

After installing Microsoft Office 2003's Service Pack 3, some users have found certain Excel, PowerPoint, Word and Corel Draw files will no longer work. The reason behind that, the company said, is that the formats are less secure and could pose a risk. Microsoft's solution? Dig deep into the system's registry to perform modifications, which could lead to catastrophe if done incorrectly ... or buy Office 2007.

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