# Programs and paths preferences

Here you can explicitly set the location of folders used by Opera, and configure external programs that Opera uses for various purposes.

## Paths

Opera directory | This is the location of Opera's files. Don't change this unless you know what you are doing.
Window storage file | This is the window storage file, used by Opera on start-up.
Download directory | If you choose "Open" when downloading a file, the file is put in this folder, as opposed to "Save", where you specify the folder each time.

## Programs

Programs often write information to <stdout> (Standard Output). If you want to read this information, it's a good idea to run the program call through a terminal.

Source viewer | Choose your favorite text editor to view the source of Web pages. You can view the source of a Web page from the View menu.
Telnet program | Telnet is used to communicate with other computers through a command-line interface. This is relevant for advanced users only.
TN3270 program | TN3270 communicates with IBM mainframes. This is relevant for advanced users only (see IETF RFC 1576 for details).
E-mail client | Select your e-mail application and set command line parameters (if necessary).
News client | Select your news application and set command line parameters (if necessary).

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