I'm using QtCreator like editor for non-qt project, creating project with option Import Existing Project. If after some time I will add somewhere in project directory hierarchy a new subdirectory with files and add to project view in QtCreator (by Add Existing Files...) then this new files will be add to ProjectName.files file but new directory will not be added to ProjectName.includes. So functions and symbols from files form new directory will not be recognized correct in old files and highlighted by editor.