/usr/lib/mime/packages/njplot is in njplot 2.3-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | text/x-clustalw-tree; njplot '%s'; description=Clustal W Phylogenetic Tree ; nametemplate=%s.phb
chemical/njplot; njplot '%s' ; description=Phylogenetic Tree ; nametemplate=%s.phb
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