The first thing, go into the properties of the file and make sure it is not read only, that is prolly the problem there.
The second thing, that is just how the game came. It was unfinished, because Microsoft was getting impatient with DA, who had a lot of different ideas, and went through 2 or 3 different versions before publishing.
Hmm, where have I come? Why does it seem so familiar to this one?