What allows people to use a program on different operating systems

API (Application Programming Interface)

Explanation:

API in its simplest terms is just like a middle man that allows your computer run programs. Every computer has an operating system, some common operating systems include Windows, Linux, Mac and others. So when a program starts running on a computer, the computer's operating system understands or knows what to do through the API of the running program

well cos like a ds it doesn't really die out, unlike for example, fifa, they always come out with a new version, so lets say your fifa 18 is charging you to update the teams and stuff, so, if messi were to go to real madrid (never gonna happen) it would switch messi to the other team, until the owners of fifa come out with fifa 19, then the game would eventually stop updating, and back to the ds, it doesn't really stop working after sometime because there's lots of things that it could be used for, and idk if u know what i'm saying, but long story short, samsung, represents the ds, if they still work, and people love them but not the new version, the old version still works, so they don't really force people to buy new phones, get me?

im not sure what your file type is. is it a .zip file