/usr/share/GNUstep/Charmap.app/Charmap.desktop is in charmap.app-common 0.3~rc1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | [Desktop Entry]
Encoding=UTF-8
Type=Application
Categories=X-GNUstep;
Name=Charmap
Comment=A powerful character map
Icon=/usr/lib/GNUstep/Applications/Charmap.app/Resources/Charmap.png
Exec=/usr/bin/openapp Charmap
FilePattern=Charmap.app;Charmap;
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