I have some code that generates a pdf file on the server and then opens the pdf in the browser via some window.open javascript. The pdf will open, regardless of filesize, in chrome & firefox. In IE (I've tried 8 & 9), if the file is > than about 4mb or so the file never opens...and I don't seem to get an error message on the client side. Any thoughts as to what the issue might be? I've run in to the same issue with file formats other than pdf.