I look around UP3RC4 and DBW, ShipPack2 is generally contained in them.
But not equally, not fully.
UP3RC4 and DBW have NEWER VERSION ships , when thay were released after old ShipPack, and they replace ShipPack2 version with other name classes.
Fokker's problem is caused by this replacing, I think.
In example, At ShipPack, German Carrier was only Graf Zeppelin and her class name was Carrier0. ShipPack2 has this version continuously.
After ShipPack, at SAS, Graf Zeppelin - Peter Strasser - Aquilla , these 3 ships pack was released with other name classes.
UP3RC4 and DBW have this newer version.
Totally, from player's eyes, UP3RC4 and DBW are seen having all ShipPack2 ships plus more new ships.
But from java code, UP3RC4 and DBW are seen generally containing ShipPack2 ship class files, but not completely - so without Carrier0 class, or other replaced classes.