Personally, I've used XP a lot back in the day, but don't remember much of the details like most users are reporting here, so I really liked to play with your website, and would definitely hire you if I was in such position.
Good luck!
Maybe they could have a fake "patch note" file within the virtual OS which frames it as a hypothetical service path upgrade (which showcases that OP does realize the slight variations in their design, while also showcasing that they can do technical writing)
Maybe styled like a word doc or something
the rest, are all aesthetic decisions haha but I was aware of some of them - I'm surprised you missed the biggest one of them all though.. also that nobody else has mentioned it yet - maybe its because nobody has tried it
the drag selection over desktop icons highlights the icons in a way much closer to windows 11 than XP... i really just thought it deserved an upgrade
edit: did i miss it or did you just add the thing about selection? you're right though