downloading csv from iis NTLM enabled

Hi,
i try to download a csv-file from iis-webserver which has NTLM enabled.
I use this code:
Dim url
url = ArgObj.Item( 0)
Dim objHTTP
Set objHTTP = CreateObject("MSXML2.XMLHTTP")
Call objHTTP.Open("GET", url, FALSE)
objHTTP.Send
WScript.Echo(objHTTP.ResponseText)

My Problem is that the german umlauts are replaced by an question mark and some characters after that umlaut are missing.
OK, MSXML2.XMLHTTP is an Object for downloading xml-Sites, and this umlauts are replaced...

Do you have any ideas?
I also tried tinyget (MS IIS Resource Kit), but have a similar problem. And wget or curl doesn't support NTLM very well...