How to open excel 2010 file in excel 2007

View Excel 2010 file in 2007

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Excel Cannot Open the File Format/File Extension Is Not Valid/Corrupted – Latest Successful Methods

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How to open Excel files in two separate windows 2010

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Pin Recent Documents in Excel to the Start Menu or Office Button Menu in Excel 2007

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How to Solve Excel Cannot Open the File ... Because the File Format or File Extension Is Not Valid.

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