"APLOT" is a truly obsolete component of InterPlot Organizer which is overdue for removal. It only supports very old versions of the DWG format (2000 and earlier IIRC). What you need is an "IPLOT" section of your InterPlot settings file. That section is honored by MicroStation, Bentley View, etc. for both DGN and all modern DWG formats. There is a field in the IPLOT section for a MicroStation pen table; that's where an AutoCAD .ctb file may be specified.
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