The pilot said he was flying the RNAV (GPS) runway 36 approach in 3 miles visibility. He said the wind was from 070° at 9 knots. At 50 feet above the missed approach point (MAP), the runway was sighted. He said he was slightly right of runway centerline and there was a right crosswind as well. When the right main landing gear contacted the runway, it folded under the body and the airplane came to a stop. According to the Federal Aviation Administration inspector who examined the accident site, the pilot made a hard landing that caused the right main landing gear to collapse. The airplane exited the right side of the runway onto the grass about 1,000 feet from the end of the runway. Further examination of the airplane revealed no mechanical anomalies or malfunctions that would have resulted in the landing gear collapse. Visibility and wind as reported by the airport's AWOS-3 (Automated Weather Observing System), was 0.25 miles and 100° at 4 knots.