http://www.xpgamesaves.com/topic/82586-2-disc-game-gtav/page-2#entry4279 Just use the guide posted on the thread above and you should be good to go :music2:
No need on Splinter Cell Blacklist m8, just convert both discs to GOD format and copy them over to your 360.
with multi-disk Games (not sure about gta5) rip your iso on convert to god (personally i always folder rip mine) and in the main folder e.g Splinter Cell Blacklist create sub folders like called Disk 1 and Disk 2 etc and place the iso content in the corresponding Folder that way fsd3 will auto switch the discs and game play will continue automatically
my way is convert the game to xex first, then just copy dvd2 to dvd1, so you have just 1 folder and play it with fsd or aurora, works fine.
after converted to GOD, do I need another tolls like Horizon? I don't really understand with GOD format. I've tried to convert to GOD format and I don't see default.xex file