A free tool to delete files blocked by something you do not know
Pros & Cons:
Besides Unlocker, LockHunter is a good alternative.
You can access the program from the right-click context menu item What's locking this file? or launch the program separately, but you cannot run it from a command line.
From the program user interface, the user can click a button to unlock or delete a file or folder, or close locking processes. Unloading DLLs, deleting locked index.dat and removing files with a reboot were found not supported.
This program supports both 32 and 64 bit Windows and worked quite well when I tested it.
LockHunter was reviewed by Gizmos Freeware on