Every time you perform a build upgrade in Windows 10, the operating system stores some bits of information related to previously installed operating system versions in the Registry. By fetching this info, you can see a list of builds that you installed to come to the currently installed version of the OS. This can be really interesting, especially if you have upgraded your Windows 7 or 8.1 OS to Windows 10 and then joined the Windows Insider Preview program. The list can be very long.
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