The open-source library xls.js is built for the BIFF-based XLS format, and the Excel 2003-2004 XML format . Please note that these are not Open XML formats that can be seen in Excel 2007-2013. So what is it? Does this mean that all / some .xlsExcel 2003 files are XML based? Or is this applicable to another Excel document? (templates, macros, scripts)
The wikipedia entry further states that when using such XML formats for storing spreadsheets, there is a loss of fidelity that was corrected in 2007 formats, so there is an invitation to confirm whether he wants to use XML or a binary file? Or are all documents created in Excel 2003 automatically XML? And is there an extension for such XML documents .xml?
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