Can't set Windows Media Center as default DVD player?

Windows Media Player is listed under possible default programs in control panel, and in the options dialogue that opens when I insert a DVD - but Windows Media Center is not. And there don't seem to be any file association settings within Media Center.

In order to play the DVD in Media Center, I have to open the program before I insert the DVD. Is that the only way? Thanks. (W7 RC1).

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