/usr/share/applications/PolyGUI.desktop is in polybori-gui 0.8.3-5build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Categories=Education;Science;Math
Comment=PolyBoRi GUI
Exec=PolyGUI
GenericName=Boolean Groebner Basis System
Icon=PolyGUI
MimeType=
Name=PolyGUI
Path=
StartupNotify=false
Terminal=false
Type=Application
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