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Trucos Visual Basic 6.0 > Cambiar el fondo de Windows desde Visual Basic
Crear un formulario y escribir:

Private Declare Function SystemParametersInfo Lib "user32" Alias
"SystemParametersInfoA" (ByVal uAction As Long, ByVal uParam As
Long, ByVal lpvParam As Any, ByVal fuWinIni As Long) As Long

Private Sub Form_Load()
Dim fallo As Integer
fallo = SystemParametersInfo(20, 0, "C:\WINDOWS\FONDO.BMP", 0)
End Sub