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I can change AutoPlay so that when I put a DVD in, it automatically opens with MPC like I want, but in the case of a DVD already being in and me opening it by clicking its icon in My Computer (relevant when I'm watching a TV series and so I'll often not watch an entire disc at once), it always opens in Windows Media Player no matter what I do. This is especially annoying because for some reason it won't play the sound on my RahXephon DVDs, and in fact it instead constantly plays a noise that sounds like I imagine being put through a woodchipper feels. So, uh, I'd rather not watch them in that, but I keep forgetting I have to right click and choose MPC from a menu.
I'm on Windows 7, by the way, if anyone knows anything about this. I admit I haven't bothered to do much Googling since it's a minor annoyance at best and usually only comes up when I'm about to watch an episode of something and would rather, you know, do that instead of Googling.