Star Wars Battlefront II savegame - this file will give you an access to all of the 16 single-player missions.
Star Wars Battlefront II trainer - use the following key combinations while playing the game, to enable the corresponding effect:
Shift+1: Infinite Health
Shift+2: Infinite Ammo
Shift+3: Infinite Stamina
Shift+4: Infinite Jet Pack
Shift+5: One Hit Kill
Shift+6: Infinite Team Life
Shift+7: Infinite Mission Time
Shift+8: Save Player Position
Shift+9: Load Player Position
Shift+0: Infinite Ship Energy
Shift+F1: Save Ship Position
Shift+F2: Load Ship Position