You want to print an existing .PLT (or .PRN) file on your printer (or plotter).
Make sure the file was created for your specific printing device (the same model). You can just copy the file to your printer:
COPY /B myfile.plt LPT1:
COPY /B myfile.plt \\server\designjet800
for a networked plotter.
If you have a networked plotter with TCP/IP interface enabled (e.g. HP DesignJet with HP JetDirect, firmware version 08.03 and higher), you can also use the LPR utility in WinNT/2000/XP (or Unix/Linux):
lpr -S192.168.0.99 -Praw -o l -d myplot.plt
where 192.168.0.99 is your plotter's IP address.
There are also several programs (freeware, shareware) for easier printing of PLT (or PRN) files from the Windows environment (e.g. PrintFile, GoPlot - see www.cadstudio.cz/download, etc.).
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