When working with Open XML documents from within SharePoint, you may want to open a specific document, modify it in some way, and then save it, either replacing the original document, or saving to a new location. This isn’t very hard, but there are a few issues. This post describes the issues and presents a minimal amount of code that shows how to open an Open XML document from a SharePoint list, modify it, and then save it back to either the same location, or a different one if you desire. In detail,
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