“$WINDOWS.~BT” and “$WINDOWS.~WS” are special system directories found in Windows 7/8/10 that are responsible for storing installed updates as well as current operating system installation files. What to do if an important file was accidentally deleted?.Cleaning the “$WINDOWS.~BT” and “$WINDOWS.~WS” folders.The “$WINDOWS.~BT” and “$WINDOWS.~WS” folders in Windows 10.The “$WINDOWS.~BT” and “$WINDOWS.~WS” folders in Windows 7 and 8.Where are located the folders “$WINDOWS.~BT” and “$WINDOWS.~WS”?.Today we will review the system folders and directories “$WINDOWS.~BT” “$WINDOWS.~WS”, find out what they are for, and clear a significant amount of disk space by removing unnecessary or unused data.