Unofficial or not, Jedi Knight: Jedi Academy was referred to as "JK3" and "Jedi Knight III" (or Jedi Knight 3) by EVERYONE until the official name was announced.
1)Star Wars: Dark Forces
2)Star Wars: Dark Forces II: Jedi Knight
3)Jedi Knight: Mysteries of the Sith: Jedi Knight Companion Missions (ie: the only expansion the series has ever known)
4)Jedi Knight II: Jedi Outcast
5)Jedi Knight: Jedi Academy
So there is no JKIV or JK5, but JA is the same as JK3. And JK3 technically doesn't exist as its own game, it's just the "working title" that JA used before it was called JA. ; )
If JK3 was planned as an expansion, why did they call it "JK3"? It didn't turn out as an expansion, either.
ThreeWaveSoftware (who worked on MP maps with Raven software) still calls it Jedi Knight 3 on their page (
http://www.threewavesoftware.com/).
The master server for JA is even called "masterjk3.ravensoft.com"!
Sure it used a similar logo element, sure it featured some of the same characters (in supporting roles), and sure it used a modified version of the previous engine JK2 used. But that doesn't make it an expansion.
It wasn't sold as one, marketed as one and didn't require the original game. It actually had MORE content than the original game and a different storyline. It stands alone just fine.
Makes sense to me!
I guess it's sort of like movie titles. Even though we call it "Star Wars Episode IV: A New Hope" the actual release title is just "Star Wars."
And "Star Wars: Episode I: The Phantom Menace" was called "Star Wars Episode I" in production.