Changed it again.  But, no it seems to be Acrobat only.  Funny coincidence this is coming on the tail- end of an another Adobe worry for me.  I found out you can't install Adobe Acrobat Reader for Internet Explorer without installing both Adobe Download Manager and Adobe AIR.  Then I tried Firefox on Windows and found out it refuses to install the plugin without admin rights, even though Firefox had been installed by a user (without admin rights).