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string xlsxFile = @"N:\FichierExcelImportant.xlsx";

ZipFile zipFile = ZipFile.Read(xlsxFile);
ZipEntry zipEntry = zipFile["xl/workbook.xml"];

List<string> xmlContents = new List<string>();
using (var ms = new MemoryStream())
{
	zipEntry.Extract(ms);

	ms.Position = 0;
	var sr = new StreamReader(ms);
	var myStr = sr.ReadToEnd();
	xmlContents.Add(myStr);
}

xmlContents.Select(x => x).First().Dump();