=== Helper Applications ===

In this page you can enter commands to open different file types.
`$f` is replaced with the filename,
`$u` with the URL.
Leave a field empty to use the operating system default application.

For the e-mail setting, the command should accept a
`mailto:` url.

For the command prompt, the command should open a console window.
A `$f` value is replaced with the directory of the current document.
