Option-Right click on a file in Finder and choose "Always open with".
To discover options like this, in any menu hold down the option key to see menu items change.
17 karma · joined February 9, 2011
"We've learned and struggled for a few years here figuring out how to make a decent computer," he said. "Mobile phone guys are not going to just figure this out. They're not going to just walk in."
- Imaginary Steve Jobs