'zunächst die benötigten API-Deklarationen
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

ShellExecute Me.hWnd, "open", "Pfad_und_Datei_zum_Dokument_File", "", "", 1

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