There is a time for all good things to come to an end, and the time has come to shut down OpenXmlDeveloper.org.
Screen-casts and blog posts: Content on OpenXmlDeveloper.org will be moving to EricWhite.com.
Forums: We are moving the forums to EricWhite.com and StackOverflow.com. Please do not post in the forums on OpenXmlDeveloper.org. Instead, please post in the forums at EricWhite.com or at StackOverflow.com.
Please see this blog post for more information about my plans moving forward. Cheers, Eric
If you're doing much Open XML development, you probably sometimes need to compare two versions of a document and look closely at the differences. Stephane Rodriguez's diffopc tool is a utility program that makes short work of this sort of a task.
Diffopc takes any two OPC (Open Packaging Convention) files as inputs (e.g., Open XML documents or XPS documents), and displayes a well-organized summary of the differences in a web browser. You can look at the parts that have changed, or drill down into a part and see the specific differences in the XML markup.
Download or read more about diffopc here.