Question regarding printing "to file"

First post, yay.

So, I'm running a mix of Autocad 2004 LT and 2004 on a mix of Windows 7
and XP machines. One of my 7 machines is 64 bit, therefore the drivers
for my plotter are not available. What I've been doing is "plotting to
file" and dumping .plt files on a network folder. Then script I wrote,
running on one of the 32bit XP machines watches that folder for any plot
files, plots them and then deletes the file. It works pretty well.

However, a problem arises when I try to plot multiple files. The number
of copies box (in the plot dialogue) greys out when I "plot to file",
only allowing me to produce one .plt file. If there is a way to produce
multiple .plt file from the standard plot dialogue, that would be the
best, however I'm open to any other solutions anyone might offer.

Thanks in advance.