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Microsoft excel up until 2007 version used a proprietary binary file format called excel binary file format (.xls) as its primary format. @reda converting xls to xlsx is fine by just amending the filet type due to the restrictions on xls and will not damage the file, i have used it and have had no issues with well over 10,000 files. The two aforementioned tools to use in combination to get a file from xls to xlsx are both free for occasional use. Excel file extension xls, xlsx, xlsm, xlsb, xps, pdf | excelcentral.com.