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Continuing another banner month of screwed-up patches, many people running Windows 10 Anniversary Update, version 1607, report that an undocumented patch “Update for Windows 10 Version 1607 for x64-based Systems (KB4033637)” just rolled out the Automatic Update chute.

Although KB 4033637 has a long history — try googling it — there doesn’t appear to be any official documentation. Blogger Günter Born traces its history to this entry from larryCG on the Microsoft Answers forum, dated July 24:
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