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Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" _
    (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" _
    (ByVal hWnd As Long, ByVal nIndex As Long) As Long
Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" _
    (ByVal hWnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private Declare Function SetLayeredWindowAttributes Lib "user32" _
    (ByVal hWnd As Long, ByVal crey As Byte, ByVal bAlpha As Byte, ByVal dwFlags As Long) As Long

Private Const GWL_EXSTYLE = (-20)
Private Const WS_EX_LAYERED = &H80000
Private Const LWA_ALPHA = &H2&

Public hWnd As Long
Private Sub UserForm_Initialize()
    Dim bytOpacity As Byte
    bytOpacity = 180 ' variável que fornece o nível de opacidade. Pode ir de 0 a 255
    hWnd = FindWindow("ThunderDFrame", Me.Caption)
    Call SetWindowLong(Me.hWnd, GWL_EXSTYLE, _
    GetWindowLong(Me.hWnd, GWL_EXSTYLE) Or WS_EX_LAYERED)
    Call SetLayeredWindowAttributes(Me.hWnd, 0, bytOpacity, LWA_ALPHA)
End Sub