What is "Undocked Update Stack" ?

Question

• what is C:\Windows\UUS\Packages\Preview\amd64 ? what is "C:\Windows\UUS\Packages\Preview\amd64\UusFailover.dll" ? what is "C:\Windows\UUS\Packages\Preview\amd64\UusBrain.dll" ? what is "C:\Windows\UUS\Packages\Preview\amd64\UusCoreHealthAggregator.dll" ? In Windows 11 , what is Undocked Update Stack specifically and exactly what does it do?

Answer 1

Hello Jeffrey T Taylor,

The path C:\Windows\UUS\Packages\Preview\amd64 usually refers to a location used by files of Windows Update related to 64bit architecture. Regarding the libraries, this is what they do on a general view:

UusFailover.dll - This library is related to the processing of Windows Update handling in case of failover scenarios. Meaning the alternatives in case of error during download, verification, install of updates.

UusBrain.dll - Controls the decision making during the Windows Update process, choosing the actions based on results and processing of update steps

UusCoreHealthAggregator.dll - As the name indicates, it is related to the health and run of the processes, usually to detect failures, monitoring and reporting.

There is still not too much information available about how the UUS (Undocked Update Stack) works on code, but it seems that it is a new technology to allow more successfull and less disruptive way of updating Windows, improving the overall experience about the process.

--If the reply is helpful, please Upvote and Accept as answer--