/usr/share/plasma/shells/org.kde.plasma.mediacenter/contents/configuration/ is in plasma-mediacenter 5.7.3-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/plasma/shells/org.kde.plasma.mediacenter/contents/configuration/AppletConfiguration.qml
/usr/share/plasma/shells/org.kde.plasma.mediacenter/contents/configuration/ConfigCategoryDelegate.qml
/usr/share/plasma/shells/org.kde.plasma.mediacenter/contents/configuration/ConfigurationContainmentActions.qml
/usr/share/plasma/shells/org.kde.plasma.mediacenter/contents/configuration/ConfigurationContainmentAppearance.qml
/usr/share/plasma/shells/org.kde.plasma.mediacenter/contents/configuration/ConfigurationShortcuts.qml
/usr/share/plasma/shells/org.kde.plasma.mediacenter/contents/configuration/ContainmentConfiguration.qml
/usr/share/plasma/shells/org.kde.plasma.mediacenter/contents/configuration/MouseEventInputButton.qml
/usr/share/plasma/shells/org.kde.plasma.mediacenter/contents/configuration/PanelConfiguration.qml
/usr/share/plasma/shells/org.kde.plasma.mediacenter/contents/configuration/panelconfiguration/
/usr/share/plasma/shells/org.kde.plasma.mediacenter/contents/configuration/panelconfiguration/EdgeHandle.qml
/usr/share/plasma/shells/org.kde.plasma.mediacenter/contents/configuration/panelconfiguration/Ruler.qml
/usr/share/plasma/shells/org.kde.plasma.mediacenter/contents/configuration/panelconfiguration/SizeHandle.qml
/usr/share/plasma/shells/org.kde.plasma.mediacenter/contents/configuration/panelconfiguration/SliderHandle.qml
/usr/share/plasma/shells/org.kde.plasma.mediacenter/contents/configuration/panelconfiguration/ToolBar.qml