Ever had such an annoying message given by Windows: Cannot delete file: Access is denied. There has been a sharing violation. The source or destination file may be in use or the file is in use by another program or user. Make sure the disk is not full or write-protected and that the file is not currently in use. Unlocker is the solution. Unlocker is an Explorer extension that allows you with a simple right-click of the mouse on a file or folder to get rid of error message such as error deleting file or folder, cannot delete folder: it is used by another person or program.