This thread is for discussions of Read and write Open XML files (MS Office 2007).

Excellent article.  It will save me a least a couple of days of digging this information out from msdn.

At work I've been tasked with opening an xlsx file and extracting the information.

Many thanks for this article which has made understanding the new file format easier.

Hallo I just installed Office 2007 and wanted to find out, how the xlsx-Format works. First I just unzipped an Excel file and tried to make sense of the structure on my own. But I failed. Your article helped my to understand the key concept behind the file structure. Thank you very much

Not a bad post.  I was looking for a way to create Excel 2007 files from code and came accross the article.  However, seeing how much work was involved - I thought it would be much easier to create an Excel 2003 file and let my Office 2007 using colleagues open the file in compatibility mode.

 Fortunately, I came accross another article, which explains how to use the OfficeOpenXml package provided by Microsoft.  Using this namespace is a breeze!

 For more info - check here: http://www.codeproject.com/office/ExcelPackage.asp