Windows 10 October 2018 Update Bugs Fixed, Says Microsoft, Rollout Restarts

Yolanda Curtis
October 10, 2018

Microsoft has now fixed this problem, and Windows 10's October 2018 Update should stop deleting these "old" folders full of files. However, that didn't go quite well, as many problems began arising for users who were updating to the newest version of Windows 10.

"Once we have confirmation that there is no further impact we will move towards an official re-release of the Windows 10 October 2018 Update", Cable noted, although he didn't indicate timing.

Microsoft can recover lost files Windows 10 October 2018 Update - But You Need To Call Them

There's still a mystery about why Microsoft let Windows 10 October update ship with the bug, because it was reported by testers of Insider releases in June and August.

Microsoft missed the bug despite users filing reports in its Feedback Hub, since the number of total reports of file deletion was too low to trigger a quicker response by its engineers.


Users who moved a Known Folder to a new drive experienced the issue if content of the old folder was not moved to the new destination.

Implementation of code to remove empty duplicate known folders automatically during upgrade. "While the reports of actual data loss are few (one one-hundredth of one per cent of version 1809 installs), any data loss is serious", Cable said in a statement. The reason why they lost them had to do with a Windows 10 feature called "Known Folder Redirection" that is supposed to redirect files stored in default Windows 10 folders, such as "Desktop, Documents, Pictures, Screenshots, Videos, Camera Roll, etc." to those same "known folders" on a different drive or on the OneDrive storage service, explained John Cable, director of program management for Windows servicing and delivery, in a Tuesday announcement. "This occurred if Known Folder Redirection (KFR) had been previously enabled, but files remain in the original "old" folder location vs being moved to the new, redirected location". That's because Microsoft attempted to fix a previous KFR issue from the April 2018 upgrade, where KFR would create duplicate but empty Known Folders. For example, the user changed the location property of the documents folder from c:\users\username\documents to another folder.


Additionally, the blog post explains in some technical detail how how the glitch happened, and says that Microsoft will assist anyone who lost their personal files with recovering their data.

So just bear this in mind if you have successfully installed the Windows 10 October 2018 Update.


Microsoft says that the new Windows 10 release is available to Windows Insiders for the time being, with a broad rollout to follow, assuming there won't be any issues with the new version.

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