What is a .ZS4 file?
A .ZS4 file is a type of file used by a program called ZSNES, which lets people play Super Nintendo Entertainment System (SNES) games on their computers. This file is special because it saves a snapshot of where you are in the game, kind of like pausing a movie and being able to start right back where you left off. This is really handy because it means you can stop playing at any point and then load your game from that exact spot later, without having to reach a save point in the game itself.
The "ZS4" part of the file name tells you that this is the fourth save slot. ZSNES lets you have lots of these save slots, from 0 to 99, so you can save your game in different places and not just overwrite the same save over and over. This means you could have a save for the beginning of a level, another save before a difficult part, and so on, up to 100 different spots.
To open a .ZS4 file, you need to use the ZSNES program. When you're in ZSNES, you can load this file to jump back into your game exactly where you saved it. It's important to remember that these ZSNES save states are different from the saves you might make in the game itself, which usually only let you save at certain points. With ZSNES save states, you can save anytime you want while playing.
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