Open-XML-SDK

The Open XML SDK is a framework for working with Microsoft Office Word, Excel, and PowerPoint documents. It includes APIs for low-level operations related to OPC packages, Flat OPC files, and Open XML markup in two forms (i.e., strongly-typed classes and LINQ to XML). It is designed to closely follow the Microsoft Office implementation of the ISO 29500 standard, but was not intended to directly provide higher-level abstractions or productivity tools.