Thank you Erel,
your tip was right, but the header needs more information to return a correct stream:
job1.Download2(link and paramter to site....))
job1.GetRequest.SetHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; rv:24.0) Gecko/20100101 Firefox/24.0")
job1.Getrequest.SetHeader("Accept","text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8")
job1.GetRequest.SetHeader("Accept-Language","de-de,de;q=0.8,en-us;q=0.5,en;q=0.3")
job1.GetRequest.SetHeader("Accept-Encoding","utf8")
job1.GetRequest.SetHeader("DNT","1")
So the correct data arrives.
Best regards
Hagen