Return a list of all Taskwarrior projects as virtual files in the data directory

def get_filesnames(self):
        """Return a list of all Taskwarrior projects as virtual files in the data directory"""
        self._update()
        projects = set(list(self._tasks.keys()) + self._task_projects + ['all_projects', 'unaffiliated'])
        return [join(self._data_location, p.split()[0]) for p in projects]