It is an open-source emulator written in C++ which is available in Windows and macOS. PCSX4 is the best emulator for Play Station 4 emulator for Pc.
If a ROM site is asking you to run an EXE it is a scam, get out.
With a few rare exceptions such as DOS, ROMs never come in EXEs. ROMs When downloading ROMs always download ZIP, 7Z, ISO or CHD.God of War is an upcoming third-person action-adventure video game in development by Santa Monica Studio and to be published by Sony Interactive Entertainment for the PlayStation 4 console.