The CSO (Compressed ISO) format was the first major compression method for PSP games. Here is why this specific 370MB version is popular:
Grand Theft Auto: Vice City Stories serves as a prequel to the massively successful GTA: Vice City . Set in 1984, two years before the events of Tommy Vercetti’s rise to power, the game offers a fresh perspective on the iconic fictional city inspired by Miami. GTA- Vice City Stories -Psp--Cso--370Mb-
Just ensure you download from a trusted scene group (e.g., RipTWG , SRW , NFO included) to avoid missing audio or broken missions. The CSO (Compressed ISO) format was the first