Most of the "Pre-Installed" versions you find today are cleverly disguised emulators (usually RPCS3 or PCSX2). These aren't native PC ports. Modders have taken the PlayStation disc images, configured the emulator settings, and wrapped them in a neat executable file. It works, and it allows for upscaling, but it requires a beast of a CPU to run smoothly. It is a simulation, not a port.
The only way to play the Killzone games on PC is through of the original console versions: killzone free download full version for pc pre installed
For years, PC gamers were left staring through the glass at a party they weren't invited to. Most of the "Pre-Installed" versions you find today