A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
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You might still be able to recover it however, chances depend on how the file was closed and where it’s stored. First, open Excel, go to File → Info and look for "Manage Workbook" if there are any just click recover unsaved workbooks.
If you can recall how it was closed like Excel crashed or just closed normally and clicking don't save?