I have a flex app downloading tar files from 16Mb to 6Gb to customers. All works perfectly unless downloading in IE and saving to a network drive. In this case both IE and the Flex app freeze during the download. My customers will require saving to a network resource. I'm using the fileReference example app from adobe.com liveDocs.
I can't download any file larger than 2Gb in IE, that's a different issue, if anyone has a solution to that I'd appreciate as well.