October 30, 2012, 3:42 PM — Here's how you can use the Get Info menu to rename a file in OS X Mountain Lion.
1. Select the file.
2. Press Command + I on your keyboard (or select File then Get info from the file's menu in the menubar).
3. Go to the Name & Extension tab.
4. Select the current name of the file.
5. Type in your new name.
Use the Get Info window in Mac OS X | Daily Mac Tips