Private Declare Function ShellExecute Lib "shell32.dll" _
    Alias "ShellExecuteA" (ByVal hWnd As Long, _
    ByVal lOperation As String, _
    ByVal lpFile As String, _
    ByVal lpParameters As String, _
    ByVal lpDirectory As String, _
    ByVal nShowCmd As Long) As Long

Dim sFile As String
 
sFile = "PowerpointDatei"
ShellExecute Me.hWnd, "Open", sFile, "", "", vbNormalFocus