>I'm seeing a number of Open Source libraries on CodePlex (e.g. NPOI, EPPlus, ClosedXML, etc.)
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>My requirements are that I need to read and write Excel spreadsheets and they might be in the old XLS format as well as the newer XLSX format.
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>I see that NPOI says it supports XLS, XLSX, and DOCX where as the others don't support XLS.
>
>Suggestions?
We are using Flexcel.