This file is indexed.

/usr/share/mime/packages/webp.xml is in kde-runtime-data 4:15.12.3-0ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<?xml version="1.0"?>
<mime-info xmlns='http://www.freedesktop.org/standards/shared-mime-info'>
  <mime-type type="image/x-webp">
    <comment>WebP image</comment>
    <glob pattern="*.webp"/>
  </mime-type>
</mime-info>