: Since there is no official RE4 for PSP, these tiny files are often fake, broken, or containing malware . If a site asks you to run an .exe file to "unlock" the game, avoid it—ROMs should only ever be .iso or .cso files. 3. Better Alternatives for Portable Play

The original Resident Evil 4 PS2 ISO weighs in at roughly . A standard PSP memory stick (original hardware) holds between 1 GB and 32 GB. A 4.5 GB file will simply not fit on a stock PSP memory card. Hence, the need for high compression .