/usr/include/KF5/KIOWidgets/KIO/ is in libkf5kio-dev 5.28.0-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/KF5/KIOWidgets/KIO/AccessManager
/usr/include/KF5/KIOWidgets/KIO/DndPopupMenuPlugin
/usr/include/KF5/KIOWidgets/KIO/DropJob
/usr/include/KF5/KIOWidgets/KIO/FileUndoManager
/usr/include/KF5/KIOWidgets/KIO/JobUiDelegate
/usr/include/KF5/KIOWidgets/KIO/KUriFilterSearchProviderActions
/usr/include/KF5/KIOWidgets/KIO/OpenFileManagerWindowJob
/usr/include/KF5/KIOWidgets/KIO/Paste
/usr/include/KF5/KIOWidgets/KIO/PasteJob
/usr/include/KF5/KIOWidgets/KIO/PixmapLoader
/usr/include/KF5/KIOWidgets/KIO/PreviewJob
/usr/include/KF5/KIOWidgets/KIO/RenameDialog
/usr/include/KF5/KIOWidgets/KIO/SkipDialog
/usr/include/KF5/KIOWidgets/KIO/SslUi
/usr/include/KF5/KIOWidgets/KIO/ThumbCreator
/usr/include/KF5/KIOWidgets/KIO/ThumbSequenceCreator