Archer

Archer, renamed Archer's Adventure, is a 1985 Australian made-for-television western drama film relating an adventurous fictional story of a journey overland taken by Archer, the first horse to win the Melbourne Cup and a 17-year-old strapper, Dave Power. Directed by Denny Lawrence, it was filmed in New South Wales' Sydney outskirts, Baulkham Hills, Megalong Valley and Snowy Mountains and Victoria's Melbourne.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.