RPCS3 handles accurate dumps much better than loose, modified folder structures. Rebuilding your MGS4 dump into an ISO using an IRD file guarantees maximum stability.
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While the direct concept of "patched IRD" is less common on RPCS3 (a PS3 emulator for PC), the decryption keys they provide are essential. You cannot simply load a raw, encrypted ISO into RPCS3. The game files must be fully decrypted. mgs4 ird file patched
