Hmm the second link opens fine for me.
Try cut and paste into the browser
http://publishermvps.com
The 3rd link copy n paste into the browser.
Basically, there is no way to open a publisher file without publisher.
There are no freeware viewers. If you have pagemaker there may be an import utility depending on the version of publisher used.
I sent you the first link just to show you what you might need to send to the people sending you the publisher file.
You can send away for a free trial copy of publisher below:
http://www.microsoft.com/office/publisher/prodinfo/trial.mspx