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Instead of typing the printer name like \\Ntserver01\Oce9400R above, you can map a LPT port to that printer. The command would be
NET USE LPT1 \\Ntserver01\Oce9400R
Depending you what OS you're running, you might want to add
/PERSISTENT:YES to the end to make the map stick.
Also, PLT files are postscript files. You can rename them as PS files and use another program, like GhostScript to print them.
Instead, we associate the PLT extension to AdobeDistiller so that when we double click on a PLT, it is converted to PDF. PDFs are easy to plot as well as share with vendors and other departments