Create URL attachment in QC workflow script

We are in Project1 and create a new defect entry in Project2 by workflow script and with data from a defect entry in project1. Both projects are in the same domain and it works fine. But we want to create an URL attachment in the new defect entry and the URL should link to the defect in Project1 which has been copied.

Example:

     set targetatt = targetafact.AddItem(NULL)
     targetatt.Type = 2
     targetatt.FileName = "td://project1.rib.rib-s-qc.rib-software.com:8080/qcbin/Defects?Action=FindDefects&DefectID=13604"
     targetatt.Description = "URL Attachment"
     targetatt.Post

The generated attachment is not recognized as URL, it's just  shown the value Defects?Action=FindDefects&DefectID=13604.

If we create a more simple URL attachment (like google.com) everything works fine:

    set targetatt = targetafact.AddItem(NULL)
     targetatt.Type = 2
     targetatt.FileName = "www.google.com"
     targetatt.Description = "URL Attachment"
     targetatt.Post