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Option Explicit

'API calls
Public Declare Function GetDesktopWindow Lib "user32.dll" () As Long
Public Declare Function ShellExecute Lib "shell32.dll" Alias "ShellExecuteA" (ByVal hwnd As Long, ByVal lpOperation As String, ByVal lpFile As String, ByVal lpParameters As String, ByVal lpDirectory As String, ByVal nShowCmd As Long) As Long
'API constants
Public Const SW_SHOWNORMAL = 1

Public Function StartCPLApp(AppName As String) As Long
    ' AppName with ending
    Dim Scr_hDC As Long

    Scr_hDC = GetDesktopWindow()
    StartCPLApp = ShellExecute(Scr_hDC, "Open", "Control", AppName, "C:\", SW_SHOWNORMAL)
End Function

Private Sub Command1_Click()
    StartCPLApp "DESK.CPL"
End Sub