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New Post: Excel cannot open file because the file format or file extension is not valid.

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First I'm prompted with a dialog in the center of the browser with the options to "Open", "Save", and "Save As". When I select open the toolbar opens at the bottom of the window showing progress, then excel opens and the spread opens in "Protected View". This is what I'm looking to accomplish. I wonder if it has anything to do with me running the code on localhost?

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