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Dir : ~/usr/share/help/C/system-admin-guide/

Edit File: mime-types-application.page

<credit type="author copyright">
 <name>Petr Kovar</name>
 <email>pknbe@volny.cz</email>
 <years>2014</years>
 </credit>

<desc>Customize which application opens a specific MIME type.</desc>
 </info>

<title>Override the default registered application for all users</title>
 
 The <file>/usr/share/applications/mimeapps.list</file> and
 <file>/usr/share/applications/gnome-mimeapps.list</file> files
 specify which application is registered to open specific MIME types by
 default. These files are provided by the distribution.

To override the system defaults for all users on the system, you
 need to create a <file>/etc/xdg/mimeapps.list</file> or
 <file>/etc/xdg/gnome-mimeapps.list</file> file with a list of MIME types
 for which you want to override the default registered application.

<note>
 Files located in <file>/etc/xdg/</file> take precedence over files
 found in <file>/usr/share/applications/</file>. Additionally,
 <file>/etc/xdg/gnome-mimeapps.list</file> takes precedence over
 <file>/etc/xdg/mimeapps.list</file>, but can be overridden by the user's
 configuration in <file>~/.config/mimeapps.list</file>.
 </note>

<steps>
 <title>Override the default registered application for all users</title>
 <item>
 
 Consult the <file>/usr/share/applications/mimeapps.list</file>
 file to determine the MIME types for which you want to change the
 default registered application. For example, the following sample of
 the <file>mimeapps.list</file> file specifies the default
 registered application for the <code>text/html</code> and
 <code>application/xhtml+xml</code> MIME types:
 
 <code>[Default Applications]
text/html=epiphany.desktop
application/xhtml+xml=epiphany.desktop</code>
 
 The default application (<app>Epiphany</app>) is
 defined by specifying its corresponding <file>.desktop</file>
 file (<file>epiphany.desktop</file>). The default location for
 other applications’ <file>.desktop</file> files is
 <file>/usr/share/applications/</file>.
 
 </item>
 <item>
 
 Create the <file>/etc/xdg/mimeapps.list</file>
 file. In the file, specify the MIME types and their corresponding
 default registered applications:
 
 <code>[Default Applications]
text/html=<var>myapplication1.desktop</var>
application/xhtml+xml=<var>myapplication2.desktop</var>

[Added Associations]
text/html=<var>myapplication1.desktop</var>;
application/xhtml+xml=<var>myapplication2.desktop</var>;</code>
 
 This sets the default registered application for the
 <code>text/html</code> MIME type to <code>myapplication1.desktop</code>,
 and the default registered application for the
 <code>application/xhtml+xml</code> MIME type to
 <code>myapplication2.desktop</code>.
 For these settings to function properly, ensure that both the
 <file>myapplication1.desktop</file> and
 <file>myapplication2.desktop</file> files are placed in the
 <file>/usr/share/applications/</file> directory.
 
 </item>
 <item>
 
 You can use the <cmd>gio mime</cmd> command to verify
 that the default registered application has been set correctly:
 
 <screen><output>$ </output><input>gio mime text/html</input>
Default application for “text/html”: myapplication1.desktop
Registered applications:
	myapplication1.desktop
	epiphany.desktop
Recommended applications:
	myapplication1.desktop
	epiphany.desktop</screen>
 </item>
 </steps>
</page>