This is a hotfix for the 1.2 update. MAKE SURE YOU INSTALL THE 1.2 UPDATE BEFORE YOU INSTALL THIS.
This will fix not being able to play any missions in Vice City's Serbian. Plus, you'll be given infinite ammo and the whole map already unlocked. You, your guns, and the city. Unleash your power against the police that stand in your way! MAKE SURE YOU VIEW THE README INSIDE THE .RAR