/usr/share/mimelnk/chemical/x-msi-hessian.desktop is in chemical-mime-data 0.1.94-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Encoding=UTF-8
Type=MimeType
MimeType=chemical/x-msi-hessian
Comment=Accelrys Hessian File
Comment[de]=Accelrys Hesse-Matrix
Comment[fr]=Fichier Accelrys de Matrice de Hesse
Icon=qc
Patterns=*.hessian;*.hessianx;*.xhessian;
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