Opera

To access local files, just type the path of the directory you want to browse into the address bar.

Windows

To start browsing the files on the hard disk, type c:, or whatever drive you'd like to access.

Linux and other Unix, Mac OS X

To start browsing at the root of the file system, just type / (a slash) into the address bar. You can of course also start in other locations. On many Linux systems, you can type, for example, /home/fred, to get to the home directory of the user fred.