This KB2553085 article is specific to Excel 2007. You can see it in the not so easy to find “Applies To” part of the article if you choose to navigate to it and expand the box. Note that it works in conjunction with KB2553026 that is already covered in this blog. IMPORTANT: after you apply the fix you still need to clean out already created files with the XLStylesTool.
Please share your experience with this fix if you end up using it. It will help everyone who reads this blog. I reached 600+ hits per week, so your comment and input will be seen and appreciated by many people affected by this very frustrating issue.