Thanks again everyone...
Basically it all confirms what I've thought, that there is no use for the key. I also had long since looted the treasure room in the dungeon (the "2nd locked vault" the strategy guide refers to) by the time I got the key from Adrianna. There was a simple winglatch just outside in the corridor that opened it. Scronan says it worked on the Lich's study door upstairs, but I tried it several times, with different characters, even playing back to that point with two different saves (thinking at first it HAD to be that door, there was NO other left!). But then I looked at the dialog from speaking with Adrianna, and she also said it would open the Lich's treasure vault "deep within the castle" or something to that effect. If anyone else can confirm it also worked on the study lock, I'd sure like to hear from them too. If so, there must have been a bug involved. I played that entire section post-patch, incidentally.
I'll email HP tomorrow and try to get their take on it's purpose, if any. I think they either forgot to equip the dungeon-area treasure vault with a lock for the key, or forgot to remove the key from the game when they decided to put a winglatch there instead.
DaveJ
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