If you have a printer selected in the File>Print dialog that has the
capability to print to that size paper, it will be available under the Paper
tab of the File>Page Setup dialog.
You do not actually have to have the printed physically connected to the PC,
but it must be installed under the Control Panel Printers and Faxes utility.
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Please post any further questions or followup to the newsgroups for the
benefit of others who may be interested. Unsolicited questions forwarded
directly to me will only be answered on a paid consulting basis.
Hope this helps
Doug Robbins - Word MVP