The Bug: as of 1.690
You are presented with a security warning when opening any popup in IE that is produced using window.open (I am runnning 11.0.9600.17107 but this is more general than that) E.g. opening 'Disk and Network Filesystems' and using the choose directory option, but as i wrote this is an issue for all window.open popups
The technical reason for this not working.
IE. does not set HTTP_REFERER when using window.open