How do I make dreamweaver CS4 the default editor for all file types dreamweaver handles?

There’s no option under preferences that I see; I can’t see dreamweaver listed in the "Default programs" in Win7 either. Heck, even Microsoft office or any other programs on my machine do not show up there (in the manage default programs). Anyhow, how do I make Dw default for all file types that Dw can handle?

gl