PHP URLs not opening from email in Outlook XP

I just tried to open the PHP link about the Navy. I'm running IE6 (freshly installed today, so no tweaks have been made) with Win2000. When I clicked on the link in the email, a "locate link" window came up (similar to an open file window). This does not happen on my coworker's machine. The only obvious difference between my computer and my coworker's computer is that I'm running Office XP and he's got Office 2000, so we've got different versions of Outlook. We are currently redoing our website so that the URL has all of the unique identifiers for each graph, so the whole point is to have people graph something, copy it into an email, and send it to someone so they get the same graph. Does this happen to anyone else? Is there something we can do to prevent it from happening? Thanks! -Natalie PS Here's the link that was sent, if you want to try it: http://www.zend.com/zend/cs/csnavalready.php Natalie S. Leotta Information Management Services, Inc. (301) 680-9770 LeottaN@ims.nci.nih.gov