/usr/share/applications/regina.desktop is in regina-normal 5.1-2build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Version=1.0
Type=Application
Name=Regina
GenericName=3-Manifold Topology
Comment=Software for low-dimensional topology
Icon=regina
Exec=regina-gui %F
Categories=Math;Education;Science;Qt;
MimeType=application/x-regina;
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