Internet Explorer was originally based upon the Mosaic browser. Like a lot of Microsoft’s tech, it’s something they acquired.
Up to IE4, it was a standalone browser. It’s IE4 where Microsoft integrated it into the OS and made do double duty as Windows Explorer, which is what you’re thinking of.
Chevrolet is in the list. Looks like it’s by brand, hence the reason that Audi is also broken out from Volkswagon.