How to do popup for file download???

Hi,
I'm trying to create a popup for file selection for download. Basically, I want to call:
call method cl_gui_frontend_services=>file_open_dialog
This works fine from a report, but from my web dynpro I get a dump because apparently there is no gui (parameters www_active and activeX are all empty).
Does anybody have any experience with this? I'm thinking:
- am I doing something wrong?
- does this method work with web dynpro at all?
- is there some other CL_WD* class for this purpose?
- are my system settings screwed up?
Thanks for all hints!
Ira

This might be helpful:
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/42af9f90-0201-0010-6099-ba67e5426bdf
- April King

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Thank you for prompt response, please find my reply with Underline:
Hi,
Maybe I'm not quite clear about the architecture you have now.
Is your asp.net application deployed in separate IIS site but in the same physical server as SharePoint?
Yes
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