First of all, I have seperated the alcatraz.ipl file into 5 parts, it was too big for GTA to load, causing a crash. Now, I've solved my first problem with the mod. But there is another bug when loading a game: when the game is loaded for just about 75%, it crashes. This seems to be a bug with the gta.dat file, but I don't know how it's caused. It might be a good idea to seperate the file like I did, but even into smaller parts.