This file is indexed.

/usr/share/GraphicsMagick-1.3.20/config/modules.mgk is in libgraphicsmagick3 1.3.20-3+deb8u2.

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"?>
<!--
  Magick Module Alias Map (modules.mgk)

  Provides a mapping from a magick format identifier string to the
  name of the loadable module which supports it.  This allows a module
  to support formats other than its own name.  This file is optional
  and the software will still function if it is removed.

  Entries are of the form:

  <module magick="MYMAGICK" name="MYMODULE" />

-->
<modulemap>

</modulemap>