Microsoft downplays stealth Windows Update

Microsoft has sought to downplay the recent, but unpublicized, automatic update of system files on Windows XP and Vista machines as "normal behavior."

A Microsoft spokesperson said, "Windows Update automatically updates itself from time to time to ensure that it is running the most current technology, so that it can check for updates and notify customers that new updates are available."

"The point of this explanation is not to suggest that we were as transparent as we could have been; to the contrary, people have told us that we should have been clearer on how Windows Update behaves when it updates itself," said Nate Clinton, Program Manager Windows Update, in a blog Friday.

For the curious, the updated files on Vista are:

* wuapi.dll
* wuapp.exe
* wuauclt.exe
* wuaueng.dll
* wucltux.dll
* wudriver.dll
* wups.dll
* wups2.dll
* wuwebv.dll

And on XP SP2:

* cdm.dll
* wuapi.dll
* wuauclt.exe
* wuaucpl.cpl
* wuaueng.dll
* wucltui.dll
* wups.dll
* wups2.dll
* wuweb.dll

All nine files are system files related to the XP and Vista versions of Windows Update (WU) itself.