Please do the following steps:
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Open your excel file.
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Click on File and Save as.
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Select where you would like to save the file (like your desktop or a drive).

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In the File Name area, name your document.
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In the Save as Type area, select CSV(Comma Delimited) from the pull down menu.

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Click Save.
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You may receive one or two warnings about the formatting of .csv, click yes.