Iron Sky is one of those movies that was great the first time I watched it, but when I watched it the second time knowing the plot and where all the jokes were going I realized it was actually pretty terrible (though still with a few funny moments here and there).
If you don’t actually remember any of it, you might enjoy the rewatch.
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.