We recently upgraded from 6.3 to 6.5 and facing the same issue. The pdf
files, robot.txt and sitemap.xml were opening on the browser window on
6.3 version is downloading the files on 6.5 version. I have tried
unchecking the "Enable For All Resource Paths" on the content
disposition filter and also added the absolute path on "Included
Resource Paths & Content Types" fields. Nothing works. Does anyone have
solution??