File compression reduces a game's massive size (like the multi-gigabyte footprint of Resident Evil 4 ) into a tiny file.
Websites offering modern, high-fidelity games compressed down to a few megabytes are almost always hosting malware, fake files, or non-functional corrupted data . resident-evil-4-pc-game-highly-compressed-gameboy
While Capcom never ported the game to Nintendo's retro handhelds, the modding and indie community has created several projects that match this description: File compression reduces a game's massive size (like