Com isso aki vc consegue... Mas vc vai precisar colocar uma parte do codigo num modulo...
'Adicione no seu formulario um botao(CommandButton)
'COLOQUE ISSO EM UM MODULE
Option Explicit
Private Declare Function FindWindow Lib "user32" Alias _
"FindWindowA" (ByVal lpClassName As String, _
ByVal lpWindowName As String) As Long
Private Declare Function FindWindowEx Lib "user32" Alias _
"FindWindowExA" (ByVal hWnd1 As Long, ByVal hWnd2 As Long, _
ByVal lpsz1 As String, ByVal lpsz2 As String) As Long
Public Declare Function SetTimer& Lib "user32" _
(ByVal hwnd&, ByVal nIDEvent&, ByVal uElapse&, ByVal _
lpTimerFunc&)
Private Declare Function KillTimer& Lib "user32" _
(ByVal hwnd&, ByVal nIDEvent&)
Private Declare Function SendMessage Lib "user32" Alias _
"SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, _
ByVal wParam As Long, lParam As Any) As Long
Const EM_SETPASSWORDCHAR = &HCC
Public Const NV_INPUTBOX As Long = &H5000&
Public Sub TimerProc(ByVal hwnd&, ByVal uMsg&, _
ByVal idEvent&, ByVal dwTime&)
Dim EditHwnd As Long
' CHANGE APP.TITLE TO YOUR INPUT BOX TITLE.
EditHwnd = FindWindowEx(FindWindow("#32770", App.Title), _
0, "Edit", "")
Call SendMessage(EditHwnd, EM_SETPASSWORDCHAR, Asc("*"), 0)
KillTimer hwnd, idEvent
End Sub
'COLOQUE ISSO NO FORM
Dim ret As String
SetTimer hwnd, NV_INPUTBOX, 10, AddressOf TimerProc
ret = InputBox("Enter Password")
MsgBox ret