Opening files by double-clicking is classic. So, is control-clicking and choosing 'Open With...' But there are other ways to open files:
- Drag files onto application icons -- even if they're in the dock. This spares that few seconds of pause when choosing 'Open With...' from above.
- Mac users often use the File -> Open dialog box as a method to open files. You can drag a file directly into this dialog box from the Finder, and the Open dialog box will automatically snap to the file's location, and highlight the file to be opened.
- Advanced users can also drag the proxy icons, often found in the top of an open file's window -- left of the filename -- into an Open dialog box or application icon as described above.
- You can drag-and-drop to applications in the Sidebar or the Toolbar.
- Finally, the keyboard shortcut to open a file is Command-Down Arrow.