/usr/share/applications/org.gnome.FontViewer.desktop is in font-manager 0.7.3-1.1.
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 10 11 12 13 14 | [Desktop Entry]
Type=Application
Version=1.0
Name=Font Viewer
GenericName=Font Viewer
Comment=Full featured font file preview application
Icon=preferences-desktop-font
DBusActivatable=true
Exec=/usr/lib/x86_64-linux-gnu/font-manager/font-viewer %u
Terminal=false
MimeType=application/x-font-ttf;application/x-font-type1;application/x-font-otf;
Categories=GTK;GNOME;Utility;Graphics;Viewer;Publishing;
Keywords=Graphics;Viewer;GNOME;GTK;Publishing;
StartupNotify=true
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