You have an embedded Excel chart or worksheet in your PowerPoint file. You can doubleclick to edit it while you're in PowerPoint but you want to get it back out of PPT and into an Excel file.
Solution
Open the embedded info in Excel and save it to a new file:
Rightclick the chart or worksheet data in PowerPoint
Choose Chart Object, Open from the pop-up menu. Excel opens with the content loaded.
Choose File, Save Copy As ...
Give the new filel a name and save.
Close Excel.
If the Excel content is linked rather than embedded, you can simply use the linked file. If it's not available, then you don't really have access to the Excel info, just a picture of it so you can't get there from here.
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