If you bought it trough steam. open steam, go to "My Games" And run it from there, otherwise. go to C:/Program Files/Rockstar Games/GTA IV/launchgtaiv.exe or gtaiv.exe
NO
Yes But No Parachute.
NO! never!
Annihilator
Under the bridge
Yes
You can fly helicopters.
press r3
It came out and is very popular
Place the disk in your PC and Continue from there
there is no cheat you get it in a mission
she is a government agent