First, thanks to Jason for his help with this issue so far. Much appreciated!
I have opened the 3 files in question in a hex editor and found nothing but garbage. They look exactly like a binary file, for those familiar with such things. In my fairly educated opinion, this indicates corrupted files since we should be able to see plain text in XML format.
I believe the easiest solution would be for the Hero staff to restore the file from a good backup (if one exists) so that those of us unfortunate enough to get the corrupted version can re-download the corrected version. What we need is for people to notify the staff in this thread if they have the corrupted version so that they will be able to confirm that this problem exists beyond myself and Enforcer84.
If anyone has other ideas for a solution, please don't hesitate to make suggestions.
Thanks,
Roger