DOWNLOAD function module not working in Portal

Hello,

We are in 4.6C. I have a piece of code that downloads an internal table to the presentation server using function module DOWNLOAD. This works fine in SAPGui. The function module DOWNLOAD does not work in the EP6 portal environment (the part where a popup is presented to the user to select the directory/file name to save the file in). Instead a screen is shown which says "This screen exists for technical reasons....".

I have been looking for options and have tried the GUI_DOWNLOAD method which does not work in the portal either.

Anyone face this issue? Please advice possible resolutions.

Thanks!