Depending on the year:
Dunadin
Hyperno.
Shocking
Shocking.
Archer
If you're asking which horse won the 2011 melbourne cup, it was Dunaden. If you're asking which horse was the first ever to win the melbourne cup, it was Archer in 1861.
The horse called Green Moon
My resources (wikipedia) tell me that Rogan Josh won the Melbourne Cup in1999
A horse named Efficient and his jockey M Rodd won the Melbourne Cup in 2007.
Phar Lap
Makybe Diva.
View came first, Bauer came second.