I am using the following code to stream a pdf to the browser:
header(\"Cache-Control: must-revalidate, post-check=0, pre-check=0\");
header(\"Pragma: public
You could try:
Content-Type = application/download
That behavior is controlled by the browser settings, so I don't think theres a way to force the "Save as" dialog to be opened.
You could try not specifying a name for the file, but I do think that it will just inherit the scripts name instead.
They most likely have Ask where to save each file before downloading unchecked (Advanced Settings). If this is the case, there's nothing you can do as this is their preference.