If you download a PS1 game and it is a .7z file under 100MB, it is playable . If you extract it and see a .bin of 700MB, you did it right. If you see a .exe file – delete it immediately (see safety below).
SafeROMs Highly Compressed: The Ultimate Guide to Retro Gaming Emulation
: Specifically used for GameCube and Wii games to save space without losing data.
When looking for content, it's important to differentiate between the website "SafeROMs" and the practice of downloading "highly compressed" ROM files. Users typically seek these to save storage space on devices like the PSP or Android phones using emulators like PPSSPP. Understanding Highly Compressed ROMs