File this under “slightly sneaky”: in Windows 8, there are two versions of Internet Explorer: one using the shiny new Metro interface, and a desktop version that looks more like the current release (and works on low-res screens). You can control which version gets launched, but only if you choose to make IE your default browser.
The default behaviour for Windows 8 is to launch the Metro version if you’re in a Metro app, and the desktop version if you’re not. The official IEBlog notes that there’s a switch which lets you elect to always use one version or the other. However, you can only alter that setting if you have IE set as your default browser. If not, it’s greyed out.
Granted, if you’ve switched to Chrome or Firefox (as most Lifehacker readers have), then you probably don’t want IE popping up under any circumstances. Nonetheless, if you’re running multiple browsers, it would be nice to be able to tweak this setting without having to constantly change your default browser.