Hi!

So I want to do a sort of OneShot styled "the game knows you're here" mechanic.
One of the most prominent features of the game is messing with your computer temporarily to help you solve puzzles, or to deepen the lore.
I wanted to include features like those in my project. I've seen some threads floating around that mess with a text file, but my tiny little JS noob brain can't get them to work.
Here are some of the features I'm talking about, perfect for making you feel a chill down your spine:
Say your computer's username (I've already achieved this, it's just here for reference)
Write .txt files into your documents folder
Create .png files in your documents folder
Game window revealing hints when dragged outside of display
Changing player's wallpaper
A second .exe that reacts with the game, telling you hints and telling a story in a certain part of the game
If I were able to replicate any/as many of these, could you please be able to explain in a very "dummy-proof" way? Thanks
EDIT: Forgot to mention , I believe OneShot was made in VX Ace