Jerry, I think he is referring to the proxies the camera creates. (optical media)
I’ve had the same thing come up. Fortunately, I work for a company where I’m able to dictate the player in most cases.
Sony makes software for reading these proxies…but it’s only for PC. (and it needs written from camera) as opposed to copied from xdcam transfer.
Luckily on Mac snow leopard, qt7 is a free download.