marvel cinematic universe - What operating system does Tony Stark use on his office desktop? - Movies & TV

I've been stumbling upon this problem for quite sometime now.

What kind of Operating System (or what is it branching from (ex: Linux, Windows...)) is Tony Stark using on his suite and Framework computer at the office when Pepper went to steal the data using the hacking dongle Tony gave her?

What would that hacking dongle do, like coding wise?

Answer

It's a fictional OS, designed by Philip Shtoll:

Not sure what the hacking dongle did exactly, but I guess it automatically accessed and downloaded certain files:

(you can watch Philip Shtoll's work reel for the movie here)