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Comments
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asgs115676yMaybe they meant you can learn open source tools like Java, PoI to create files you can view on closed source tools like Excel
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The Open Office XML-based spreadsheet format using .xlsx as a file extension has been the default format produced for new documents by versions of Microsoft Excel since Excel 2007
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refex2596y@gitoutofhere it talks about creating an excel file, not opening it with Ms Excel. ApachePoi is open source and an awesome library to create spreadsheets
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