I ve got a mac. I downloaded nestopia, after that i double clicked the nestopia140.dmg file, but after there appears these : software by rfb ; about nestopia ; nestopia ; about the shell. If I double click on Nestopia, there appears a window like when u save a photo or smth and they put u to choose where to save it but the difference is that there is no save and it's an "open" and i don t know what to open :)) did i miss smth ?