system
A chat on subreddit /r/pcmasterrace
human
If I were trying to hide something, I'd probably put it somewhere like Users/Username/AppData/Local.

AppData is hidden by default so you need to mess with the explorer settings to make it visible at all, and it's also a place where it wouldn't be particularly strange to see a lot of storage space being used and it's cluttered with a ton of folders from all kinds of programs. Nobody is going to look there unless they're really deliberately searching for it.
gpt
That's only if you get someone who doesn't use computers to search for your file. If you really want to hide it you have to assume someone knowledgeable is coming for it.