General Questions on iBackupUnlocker (iTunes Backup Password Recovery)

Find the Manifest.plist in the specific path:

Windows XP or lower
C:\Documents and Settings\Administrator\Application Data\Apple Computer\MobileSync\Backup\Manifest.plist

Windows Vista or above
C:\Users\Administrator\AppData\Roaming\Apple Computer\MobileSync\Backup\Manifest.plist

Windows 7
C:\Users\Administrator\AppData\Roaming\Apple Computer\MobileSync\Backup\Manifest.plist

MAC OS X computers
~Library/Application Support/MobileSync/Backup\Manifest.plist