Windows 8 won't let you connect to a wireless network that uses WEP with shared-key authentication.
That's awesome for the greater good and all, but right now I want the "do it anyway" button, and if you run Windows 8's network diagnostics wizard, it hints that one exists:
The wireless network that you are trying to connect to requires shared-key authentication, a low security setting that is not recommended by Windows. ...
If you want to connect to this network without changing security settings, you need to manually create a profile.
I created a profile using the "Manually connect to a wireless network" wizard, but there does not seem to be any option to choose shared-key.
How do I create a profile for shared-key authentication?