For what it's worth I've never heard what you describe called "winded". To me winded means getting the wind knocked out of you. I wonder if it is a regional thing.
In the northeast of the US, getting winded is breathing heavily from exertion. It implies reaching your max exertion point.
I would think the rest of the US uses it the same way, just based on talking with friends throughout the country. I'm not sure if our brethren to the north use it the same way.
Interesting. I always think Australia's as being pretty culturally homogeneous, but obviously that isn't really true when you look really closely. I am curious to know what part of .au did you grow up in / live in? I grew up in Tasmania, lived for 10 years in Melbourne, and the last 5 in south east Queensland.