AS 3.0 - using ExternalInterface.call to open a .pdf

Hi - using Flash - AS 3.0:
I am trying to use ExternalInterface.call to open a .pdf file - but it is not working - nothing is happening...
ExternalInterface.call ("window.open","diagrams/v1/crh.pdf", "WindowName", params);
but this line DOES work - call an .html file to open.
ExternalInterface.call ("window.open","m5_quiz/v1/quiz.html", "WindowName", params);
I can't find any information that says this should or shouldn't work - it seems to me it should open it.
To get around this - I have been using 'navigateToURL' to open the pdf file - but that triggers the pop-up blocker - using the External Interface call does not.
Any help/ideas?
Thanks,
Lisa

I agree - that code - if it opens an html should open a pdf - but it doesn't. And I don't know why..
Why is the code screwy? Could I do it better another way?
Thanks

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My first problem was the random activation of the pop up
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there,
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