Ejecutar presentación en Powerpoint desde Access

Te aconsejo que lo hagas con SHELLEXECUTE...
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En el encabezado del formualrio (GENERAL) colocas esto:
Private 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
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Y para usarla simplemente :
ShellExecute(Me. Hwnd, "Open", "c:\MiPresentacion.ppt","", "", 1)
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Y LISTO...
Att:telemaco