I recently upgraded FM 12 adv to FM 15 adv. However FM12 is still on my computer. When I double click a file created with FM 12 it opens in FM 12, not FM 15. Further, if I create a file with FM 15, when I double click it, it also opens in FM12 and not FM 15. Obviously I want to use FM 15. Do I need to uninstall FM 12 even though I might have a need for it?