.NET Framework 3.5 Makes IIS Translate Gibberish

After you install .NET framework 3.5 you may find that your IIS interface prefers gibberish over your current language. Well, at least on the surface it does.So I was bringing a server up to the patch / .NET framework versions as my development environment, and I opened IIS to configure AJAX, and I see this:

So, I say, I wonder if the properties are right? And indeed they are.

Even if I try a rename, it swaps it for the right text.

Rebooting solves it, however it is a curious change(and also reasonably scary).