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====== Exo - exo-preferred-applications - Preferred Applications ======
As of Xfce 4.3, the **Preferred Applications** framework can be used to easily manage default applications used for various services. This includes selecting the default application to be used as a web browser, mail reader, file manager and terminal emulator.

  * **[[#Usage|Usage]]**
  * **[[#Internet|Internet]]**
  * **[[#Utilities|Utilities]]**
  * **[[#Command-line Options|Command-line Options]]**

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===== Usage =====
You can access the application by clicking on the **Preferred Applications** button in the [[:xfce:xfce4-settings:manager|Xfce Settings Manager]]. The window contains two tabs containing the various applications that can be customised. 

The following application typss are supported by ''exo-preferred-applications'':

  * WebBrowser       - The preferred Web Browser.
  * MailReader       - The preferred Mail Reader.
  * FileManager      - The preferred File Manager.
  * TerminalEmulator - The preferred Terminal Emulator.

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===== Internet =====

The first tab of the Preferred Applications window allows you to select your default Web Browser and Mail Reader. The Web Browser will be used to open hyperlinks that you click on and to display the documentation, whereas the Mail Reader will be used to compose emails when you click on email addresses, for instance on a website.

<figure "Preferred Internet applications">{{:xfce:exo:4.16:preferred_applications.png?nolink&|}}</figure>

To select a different web browser to be used for opening links, click the drop-down menu in the {gui>Web Browser} section, and choose your desired browser from the list of web browsers that are detected.

If the browser you are looking for is not automatically detected by the system, you can select {gui>Other...} from the drop-down menu and a dialog will appear asking you to enter the command to execute the custom browser, as shown below. 

<figure "Specify a custom Web Browser">{{:xfce:exo:4.16:custom_apps.png?nolink&|}}</figure>

The ''"%s"'' in the command will be substituted with the URL when you click on a hyperlink. 

<note tip>When running just the preferred Web Browser without any URL, i.e. using ''exo-open --launch WebBrowser'', only the binary of the specified command will be used and any parameters will be stripped off. In the example above, with ''mywebbrowser "%s"'' as the custom web browser, the command ''mywebbrowser'' will be used to open the browser without an URL.</note>

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===== Utilities =====
The second tab of the Preferred Applications window allows you to select your default File Manager and Terminal Emulator. The File Manager will be used throughout the system to open folders to browse files, and the preferred Terminal Emulator will be used to run scripts and launch applications that need to be run in a CLI environment.

<figure "Preferred utility applications">{{{:xfce:exo:preferred_applications_2.png?nolink&|}}}</figure>

For custom terminal commands, the ''"%s"'' in the command will be substituted with the application to run. Otherwise, the same rules apply as described in the section above.

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===== Command-line Options =====

A simple command line front-end to the Preferred Applications framework is included, called ''exo-open''. You can use this utility to launch the preferred application for a certain category or open URLs with the default URL handler.

''exo-open'' supports two operation modes. The first will simply launch the preferred application for a certain category, optionally passing a parameter. For example, to launch the command ''mutt'' in your set preferred Terminal Emulator, you would use:

  exo-open --launch TerminalEmulator mutt

In order to open the preferred Web Browser with no additional parameters, the following command would be used:

  exo-open --launch WebBrowser

The second mode supported by exo-open opens all parameters passed to it with the default URL handlers. Here URLs mean either fully qualified URLs (i.e. ''https://www.xfce.org/'' or ''mailto:xfce4-dev@xfce.org''), or local paths (i.e. ''~/myfile.txt''). For example, to open ''~/file1.mp3'' and ''~/file2.txt'' in the set default applications, you would use the following command:

  exo-open ~/file1.mp3 ~/file2.txt

To start composing an email to the xfce4-dev mailing list in the preferred mail reader application for instance, you can type:

  exo-open mailto:xfce4-dev@xfce.org


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