XLS files are Excel workbook files created in Excel 97 or Excel 2003. The 2007, 2010 and 2013 versions of the program use the XLSX format by default to save workbooks, but can also use the XLS format.
Excel's Save As command lets you save a single worksheet in the CSV (comma seperated value) format, but not an entire workbook. Saving individual sheets by hand is a tedious project for large ...
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