Plot.NumberOfCopies doesn't apply to PlotToFile?

We use a customized VBA routine to standardize our office's plotting
and plot accounting. The routine works well for single plots, and we
would like to add the option to send multiple copies of each plot.

The problem is that the NumberOfCopies property doesn't seem to apply
to the the PlotToFile method. It seems to work fine for PlotToDevice.
We prefer to process plots to file then manage them through queues,
rather than send them directly to the plotters.

'Here is an example to illustrate:
Set Plot = ThisDrawing.Plot
Plot.NumberOfCopies = 3

'This line creates a plot file for only 1 copy (@PJL SET COPIES=1)
Result = Plot.PlotToFile("test.plt", "test.pc3")

'This line successfully sends 3 copies to the plotter
Result = Plot.PlotToDevice("test.pc3")

We are using ACAD 2002 with xes7.hdi driver for our Xerox 8830
plotter.

Any suggestions would we appreciated.

Regards,
Jerry