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/usr/share/glib-2.0/schemas/org.cinnamon.desktop.thumbnailers.gschema.xml is in cinnamon-desktop-data 3.6.2-2.

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<?xml version="1.0" encoding="UTF-8"?>
<schemalist>
  <schema path="/org/cinnamon/desktop/thumbnailers/" id="org.cinnamon.desktop.thumbnailers">
    <key type="b" name="disable-all">
      <default>false</default>
      <summary>Disable all external thumbnailers</summary>
      <description>Set to true to disable all external thumbnailer programs, independent on whether they are independently disabled/enabled.</description>
    </key>

    <key type="as" name="disable">
      <default>["image/jp2"]</default>
      <summary>List of mime-types for which external thumbnailer programs will be disabled</summary>
      <description>Thumbnails will not be created for files whose mime-type is contained in the list.</description>
    </key>
  </schema>
</schemalist>