From your help in 2007:
To unpack a publication on a single disk or network drive, do the following:
In Microsoft Windows Explorer, double-click the .zip or .pdf file.
Type the path to the folder where you want to save the unpacked files, or browse
to a folder, and then click OK.
To open the publication in Publisher, navigate to the folder that contains the
files, and then double-click the file with PNG in the name and a .pub extension
(for example, publication1PNG.pub).
Note Fonts that are embedded in the unpacked publication can be loaded on the
new computer, but they can be used only by the publication in which they are
embedded.
