I want some help to deal with settings up a file association for a game in Windows Vista. The game that I am downloading is Big City Adventure: San Francisco by BigFish. When I try to download the same it gives me a error saying that there is no associated program available in Vista to perform this action. What does that means. Also the message says that I need to create a file association via Control Panel. How to do that. It is a game and it works just downloading it. You just need to install it anyway. The extension that I had seen was .rgp which looks very different. While other games that I had downloaded were .exe. They work simply by downloading. I got this problem after upgrading to Vista from Windows XP.