Problem with GetROProperty

[QADBA]

Hello,

i've a problem with closing certain windows.
I want to close all browser windows with a specified url, regardless if the window is opend bevor the script is started or at run time of the script.

So i use following code:

Code:

While Browser("Creationtime:=" & CreationTime).Exist
    URL = Browser("Creationtime:=" & CreationTime).GetROProperty("URL")
    If instr(URL, Mask) Then
        Browser("Creationtime:=" & CreationTime).Close
    Else
        CreationTime = CreationTime + 1
    End If
Wend

Most windows can be closed without any problem.
But there is always a window that remains open. A page with a pdf-file, something like http://www.test.com/test.pdf
If i want to get the url of such a page, the URL is always blank?

Can someone help me, please?
Thank you