[AccessD] OpenArgs issue in A2207

I'm having a bit of cerebal flattulance this morning.

I'm calling (both via code or the immediate window):
docmd.OpenForm "frmRpoPartsHistory",,,,,,966


Private Sub Form_Load()
Debug.Print Me.OpenArgs
End Sub

Private Sub Form_Open(Cancel As Integer)
Debug.Print Me.OpenArgs
End Sub

Both subs print Null

Am I doing something wrong, or do OpenArgs work differently in A2007?

Is this Access telling me that I've been away too long?

D