This is a compressed version of the ISO format unique to the PSP. It saves valuable space on your Memory Stick, though it can occasionally cause slight stuttering during heavy loading screens on older PSP hardware. Features of the "New" Resident Evil 4 PSP Editions
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While CSO files save space, they can cause minor loading stutters on older PSP models (1000/2000). If you have a 3000 or PSP Go, CSO is fine. This is a compressed version of the ISO