/usr/share/kde4/apps/plasma/plasmoids/org.kde.active.welcome/ is in plasma-widgets-active 2.0+git2012021101-0ubuntu4~ppa3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/kde4/apps/plasma/plasmoids/org.kde.active.welcome/contents/
/usr/share/kde4/apps/plasma/plasmoids/org.kde.active.welcome/contents/code/
/usr/share/kde4/apps/plasma/plasmoids/org.kde.active.welcome/contents/code/ActivitiesPage.qml
/usr/share/kde4/apps/plasma/plasmoids/org.kde.active.welcome/contents/code/AppsPage.qml
/usr/share/kde4/apps/plasma/plasmoids/org.kde.active.welcome/contents/code/StartPage.qml
/usr/share/kde4/apps/plasma/plasmoids/org.kde.active.welcome/contents/code/welcome.qml
/usr/share/kde4/apps/plasma/plasmoids/org.kde.active.welcome/contents/images/
/usr/share/kde4/apps/plasma/plasmoids/org.kde.active.welcome/contents/images/example_image.png
/usr/share/kde4/apps/plasma/plasmoids/org.kde.active.welcome/metadata.desktop