The "IV A New Hope" can easily be explained by the fact that it's printed on the bonus disc accompanying EIV:ANH. It is not unusual for bonus discs to bear the title of the feature, rather than the bonuses contained thereon. In fact, that's how it's labeled: Star Wars IV A New Hope Bonus Disc.

By way of comparison, disc three of Return of the King: EE is simply labeled, "Return of the King / The Appendices," instead of the title of the program ("The Appendices Part 5: The War of the Ring").