As discussed in the meetings, I'm the custodian of a Visual Studio 2010/2012/2013 plugin which allows editing of Open XML documents: https://visualstudiogallery.msdn.microsoft.com/450a00e3-5a7d-4776-be2c-8aa8cec2a75b If you're feeling creative, it's open sourced on Github: https://github.com/OfficeDev/Open-XML-Package-Editor-Power-Tool-for-Visual-Studio Chris