It all depends on if UAC is turned on or off. If it is off, then the files would be in the normal Aces High II installation folders.
It also depends on whether or not you have permanently set the game to "Run as Administrator" or not. By default it is not set to run that way, but can be changed by the user. If it is on, then the state of UAC has no effect on where the files are placed as they will always be in the game's installation folder.
The "Where are my files" information is for those who have UAC enabled and have not set the game to "Run as Administrator" because the files will not be where they should be.
Are you telling me the 64 bit version of Vista puts them somewhere else?
How much more needless work do you think Microsoft can create for support staff around the world?