Mimo,

Please try this:
Code:
Private Declare Function mciSendString Lib "winmm.dll" Alias "mciSendStringA" (ByVal lpstrCommand As String, ByVal lpstrReturnString As String, ByVal uReturnLength As Long, ByVal hwndCallback As Long) As Long
Sub OpenCDDoor()
   mciSendString "Set CDAudio Door Open Wait", 0&, 0&, 0&
End Sub

Sub CloseCDDoor()
   mciSendString "Set CDAudio Door Closed Wait", 0&, 0&, 0&
End Sub
Regards,
TheBao