I am not too sure of the architecture, since I don’t use Apple products.
As I follow the conversation, he plugged an iPhone into a Windows computer and got what purported to be a software update from Apple. If this software update is for iTunes on a Windows PC, isn’t a .msi file what your would expect? I don’t see why plugging in an iPhone would activate a request to update Windows software, however.
Plugging in the iPhone activated a request to up date the itunes software for a PC.
You’re correct for Win updates, and I’m also bothered about the tethering. Apple needs to know.