/usr/share/app-install/desktop/plasma-workspace:plasma-windowed.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 | [Desktop Entry]
X-AppInstall-Package=plasma-workspace
X-AppInstall-Popcon=260
X-AppInstall-Section=universe
Name=Plasma Windowed
Comment=Run Plasmoids as simple applications
Exec=plasmawindowed %u
Terminal=false
Hidden=true
Icon=plasma
Type=Application
X-DBUS-StartupType=Unique
InitialPreference=1
X-Ubuntu-Gettext-Domain=app-install-data
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