REF:https://superuser.com/questions/915173/delete-old-windows-program-files-from-second-drive
Windows 10 @ ASUS X450J
1. cmd @ administrator
2. takeown /F "D:\Program Files" /A /R /D Y
3. cacls "D:\Program Files" /T /grant administrators:F
4. rmdir /s /q "D:\Program Files"
users 目錄部分無法刪除。