The Resident Evil games available for the PSP are originally PlayStation 1 (PSX) titles. Sony officially ported these to the PSP as digital downloads.
If you find a file that size, it is either a fake virus or a demo.
What is currently installed on your device?
Example path: Memory Card -> PSP -> GAME -> Resident Evil 3/EBOOT.PBP
The search for a in a "highly compressed" format often leads to a mix of classic titles, fan-made mods, and technical workarounds designed to bring the iconic survival horror experience to the PlayStation Portable (PSP) or the PPSSPP emulator . The Evolution of Resident Evil on PSP
You cannot run a RAR or 7Z file directly on your emulator or console. You must extract it first.