There is a questline that was accidentally left out of the final game due to a misnamed file. "A Test of Determination" is a questline for the Vampire Clan where the given objective is to confront a Daedra in the local dungeon where it lives over the control the player's bloodline has in a given region. The binary file is named P0B1XL08.QBN and the text-file is named P0B10L08.QRC. As a result of this oversight, the player can never get this quest unless you change the name of one file so that it matches the name of the other.
Contributed by MehDeletingLater