/usr/share/app-install/desktop/rxvt-unicode:rxvt-unicode.desktop is in app-install-data 15.10.
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 15 16 17 18 19 20 21 22 | [Desktop Entry]
X-AppInstall-Package=rxvt-unicode
X-AppInstall-Popcon=71
X-AppInstall-Section=universe
Name=Rxvt Color Unicode Terminal
Comment=Use the command line
TryExec=urxvt
Exec=urxvt
Icon=urxvt_48x48
Type=Application
Categories=Utility;TerminalEmulator;
StartupNotify=true
Keywords=Run;
Actions=New
[Desktop Action New]
Name=New Rxvt Color Unicode Terminal
Exec=urxvt
OnlyShowIn=Unity
X-Ubuntu-Gettext-Domain=app-install-data
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