Vb syntax Visual Studio 2010: Shell syntax

I am trying to launch an Access Database but it does not work: -

  Dim Pathstr As String
            Pathstr = "C:\Program Files\Microsoft Office\Office12\MSACCESS.EXE"
            Dim Exestr As String
            Exestr = "C:\My Folder\My AccessDb.mdb"
            MsgBox(Pathstr & " " & Exestr)
            Shell(Pathstr & " " & Exestr)

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I think it may be the spaces in the folder name, can anyone help?