I love the Finder's Open With command, which appears when you right-click or control-click a file. The Open With command displays all of the applications that should be able to open the file, and lets you choose the one you want to use. This is a great way to open a file with an app other than the default. For instance, the default app for opening a JPEG is Apple's Preview, but you might want to open it with Photoshop. No problem; just use the Open With command.
Screen shot courtesy of Coyote Moon, Inc.
I hate the Finder's Open With command. Over time, as I install and uninstall apps, or if I boot my Mac from another startup drive, the Open With command becomes cluttered with duplicate entries that may point to apps located somewhere else. For instance, after booting from a cloned startup drive, I now have two entries for Photoshop. One is in the usual location in the /Applications folder; the other is on a backup drive that I don't want to have any active use occur on.
Fortunately, you can delete duplicate entries in the Open With command by using a simple Terminal command. Here's how: