help - conversion of mac files to pc?

I've currently acquired two imaging programmes both in mac. I've got a pc and am trying to run them. The first one was a hqtx files of which i downloaded iceows. This was fine and showed the images but when i tried to open the 3d player taht comes with it to run the images - nothing. The other programme requires bryce, which i'm trying to download free - any sites? I've also been informed that i'll probably need another downoad to open this anyway- what would that be?