And here I, it's called Firefox.exe, that's just a, a Windows convention for how to name a file which is a program, but it, it helps keep things clear so I'll follow that. so Firefox.exe, that file it has a lot of bytes in it and for the most part, those bytes are just the instructions that make up that program plus some icons, and pictures, and some other stuff. so, what I want to think about is, well, what happens when you double-click Firefox.exe? 