2.0 http://www.w3.org/2005/Atom Excel File Format Soluton for End Users & Developers – Merge XLTX to XLSM via C#https://products.aspose.com/cells/net/merger/merge-xltx-to-xlsm/Recent content in Mer......org/2005/Atom Excel File Format Soluton for End Users & Developers...to XLSM via C# on Excel File Format Soluton for End Users & DevelopersHugo...