Thus if your Windows 10 installation is less on disk space, you may safely delete $WINDOWS.~BT and $WINDOWS.~WS folders and can free up some space on the system hard drive. However, after the upgrade, these folders are not of prime importance. When Microsoft offered free Windows 10 upgrade to Windows 7/8/8.1 users, Windows 10 upgrade files were automatically downloaded to these folders. These folders are similar to Windows.old folder but these folders may also store installation files that Windows would need for edition upgrade.
In most of cases, this drive is C: and thus these folders can be located as C:\$WINDOWS.~BT and C:\$WINDOWS.~WS. $WINDOWS.~BT and $WINDOWS.~WS folders are there in the system root drive, where Windows is installed. What Are $WINDOWS.~BT And $WINDOWS.~WS Folders?
This article talks about these special folders and will show you how to manage them.
These are hidden folders and contains data about Windows upgrade process.
After upgrading your Windows to newer edition from older edition, you might notice some special folders in system root drive.
