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.

Businesses that switch to Mac computers may encounter problems when attempting to open some file types, such as Excel Spreadsheet (XLS) files. Macs do not have a native program for opening XLS files, ...

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