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Option Explicit

Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" _
      (ByVal lpClassName As String, ByVal lpWindowName As String) As Long

Private Declare Function SendMessageA Lib "user32" _
      (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Integer, _
      ByVal lParam As Long) As Long

Private Declare Function ExtractIconA Lib "shell32.dll" _
      (ByVal hInst As Long, ByVal lpszExeFileName As String, ByVal nIconIndex As Long) As Long

Private Sub UserForm_Initialize()
    Dim Fichier As String
    Dim x As Long
    
    'Chemin et nom du fichier icône à afficher
    Fichier = "C:\Documents and Settings\mimi\dossier\bouton.ICO"
    'Vérifie si le fichier existe
    If Dir(Fichier) = "" Then Exit Sub
    
    x = ExtractIconA(0, Fichier, 0)
    SendMessageA FindWindow(vbNullString, Me.Caption), &H80, False, x
End Sub