When you see a "Modern Warfare 2 PSP CSO" download online, it typically refers to one of the following:
on a handheld device, these are the verified official titles: Call of Duty: Roads to Victory
The original Modern Warfare 2 (2009) was developed for high-end consoles like the PlayStation 3, Xbox 360, and PC. The hardware of the PSP was simply not powerful enough to run the game’s engine, leading Activision to focus on the Nintendo DS for its portable spin-offs during that era. What are "MW2 PSP CSO" files?