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and use it. Therefore all you need to do is to install a description file for the thumbnailer (a <code class="filename">.desktop</code> file)
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in one of the <code class="filename">$XDG_DATA_DIRS/thumbnailers/</code> paths. For example, if you want to register the
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thumbnailer for your user account only, you can install the file into the folder <code class="filename">~/.local/share/thumbnailers/</code>. The <code class="filename">.desktop</code> for thumbnailers has the following format.
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Thumbnailer description files utilize the <a class="ulink" href="http://standards.freedesktop.org/desktop-entry-spec/latest/" target="_top">Desktop
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Entry Format</a> with a special <code class="literal">Type</code> of <code class="literal">X-Thumbnailer</code> and special field
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<code class="literal">X-Thumbnailer-Exec</code> with new field codes. Basically, a thumbnailer description file has the following format.