If you have ungraded to Mavericks and also installed the latest iWork Applications (Numbers, Pages and Keynote) you may see this dialog appear:
If you see this, it is because you are using the previous version of the application while attempting to open a new-format file. Both the previous and new versions of the iWork applications are installed on your computer.
The New versions are located in the folder "/Applications" while
the previous versions are located in the folder "/Applications/iWork '09"
They have distinctly different icons:
It is a good idea to know exactly which application you are launching before you try to open a document. One thing you can do is keep the version want to use in the Dock by dragging the application from the Applications folder to the Dock.


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