The most useless dialog in Windows?

It amuses me when people complain about things in Windows that are complete non-issues (like the Windows 3.x-era Fonts window from Windows Vista). But how about the real stupidity? Ladies and gentlemen, I present Exhibit A:

So what's wrong with this dialog, you ask? (Most likely because you've never tried to use it.)

It doesn't work. Almost ever.

In this case, I actually do know which application I need to run. But what the heck, let's let Windows do its magic and see what happens. And what happens, almost every single time, is this:

Absolutely freaking useless.