/usr/share/app-install/desktop/gnome-font-viewer:gnome-font-viewer.desktop is in app-install-data 0.12.04.4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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X-AppInstall-Package=gnome-font-viewer
X-AppInstall-Popcon=10970
X-AppInstall-Section=main
Name=Font Viewer
Comment=Preview fonts
Icon=preferences-desktop-font
Exec=gnome-font-viewer %u
Terminal=false
Type=Application
StartupNotify=true
NoDisplay=true
MimeType=application/x-font-ttf;application/x-font-pcf;application/x-font-type1;application/x-font-otf;
X-GNOME-Bugzilla-Bugzilla=GNOME
X-GNOME-Bugzilla-Product=gnome-utils
X-GNOME-Bugzilla-Component=font-viewer
X-GNOME-Bugzilla-OtherBinaries=gnome-thumbnail-font
X-GNOME-Bugzilla-Version=3.4.0
X-Ubuntu-Gettext-Domain=app-install-data
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