Yes, it's fully in English.
!Global("X#MontBoss","GLOBAL",1) !Global("X#XzarBoss","GLOBAL",1) True()
Replace foo with their internal scripting name, which is usually their name for the joinables--Minsc, Dynaheir, Xan, etc.
I'm seeing it with quests from Gavin, with BGQE stuff, and various other things.
Try this: In your state.ids, change this line: 0x80101FEF CD_STATE_NOTVALID to this: 0x00101FEF CD_STATE_NOTVALID
And I think this check works the same in all IE versions.