The pilot reported that upon touchdown on runway 12, the left quartering headwind switched to a direct crosswind forcing the nose of the airplane to the left. The right wing contacted the runway surface and the airplane nosed over, sustaining substantial damage to the empennage, vertical stabilizer, and rudder. Wind at the time of the accident was reported to be from 070 degrees at 12 knots gusting to 22 knots. The pilot stated that there were no preaccident mechanical malfunctions or anomalies that would have precluded normal operation.