This blog post introduces a small command line utility (OpenXmlDiff.Exe, code attached to this page) that compares two Open XML documents and produces a textual report of the differences in markup between them. This utility was born out of sheer frustration. I've been needing this utility for months. I've always accomplished my goals without it, but it would have been a time-saver several times in the past. I've heard rumors of this existing elsewhere, but it has always eluded me. Using this utility,
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