@DagonSeaGod - LadyHonor has it right... the area files are an asset should be visible in the toolset, if you've set things up correctly. (And if things aren't done correctly, you will break your game.)
Have you both created a new module and made Single Player assets available to the new module? If not, I recommend reviewing the creating a module page on the DA Toolset Wiki and the related tutorials on Beyond Ferelden.
To your original query, there are other extracted assets that can't be edited and saved with the toolset... UTC files, for one. And really, that's not surprising... a developer toolset isn't designed or meant for making hack-y edits to extracted assets, especially when the asset can be edited properly.
But if you really are determined to string edit extracted .are files, you can do that with either pyGFF or TlkEdit... it's been a long time since I mucked around with that kind of edit, so I cannae recall which utility worked for that task.
Edited by theskymoves, 09 August 2018 - 12:39 PM.