Austrian will run an extra flight on 27th December from MAN to VIE as OS1474, one way only, however, it's down as a B777-200.
One presumes it's a 'dead leg' flight after a charter or visit to the paint shop. The normal MAN flight still runs later in the day, so, maybe Austrian are seeing if they can make money rather tan just position the aircraft back to VIE.
The flight is bookable on their website, so, a good chance to take a wide body intra Europe flight.