How to recover product keys in Windows

decode_windows_key.vbs

' Windows product keys are base24 encoded
' source: https://ngb.to/threads/26224-Key-offline-aus-Backup-auslesen
' registry location: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\DigitalProductId
wscript.echo (ConvertToKey (Inputbox("Key-String","Eingabe bitte")))
 
Function ConvertToKey(Key)
    Const KeyOffset = 52
    i = 28
    Chars = "BCDFGHJKMPQRTVWXY2346789"
    Do
        Cur = 0
        x = 14
        Do
            Cur = Cur * 256
            Cur = Key(x + KeyOffset) + Cur
            Key(x + KeyOffset) = (Cur \ 24) And 255
            Cur = Cur Mod 24
            x = x -1
        Loop While x >= 0
        i = i -1
        KeyOutput = Mid(Chars, Cur + 1, 1) & KeyOutput
        If (((29 - i) Mod 6) = 0) And (i <> -1) Then
            i = i -1
            KeyOutput = "-" & KeyOutput
        End If
    Loop While i >= 0
    ConvertToKey = KeyOutput
End Function