'Open external files that can be handled either by the Editor or the
variable explorer inside Spyder.'

def open_external_file(self, fname):

    fname = encoding.to_unicode_from_fs(fname)
    if osp.isfile(fname):
        self.open_file(fname, external=True)
    elif osp.isfile(osp.join(CWD, fname)):
        self.open_file(osp.join(CWD, fname), external=True)
