One of the things we love about Mac OS X is the ability to do the same thing just in different ways.
Case in point, opening files and directories in GUI view from the Mac OS X Terminal.
Open up the Terminal app (located in Application/Utilities) and navigate to your Mac's Desktop with the following command (replacing your-username-here with your account username):
Now type out the following to target a file or directory of your choice:
And your Mac will obligingly open that file (in the appropriate program) or directory (in the Finder) for you.