Have you experience a problem in file association of Windows Vista? It's easy to fix. Here's a quick tip to all of you.
Go to Control Panel->Default Programs->Set Associations.
In this example I will change ".mp3" files file association to WinAmp. After highlighting .mp3 name, Click "Change program".
Then Select Winamp as the default .mp3 files player. If you want another program, expand 'Other Programs'. And if it is not included in the list, click Browse and select the program (.exe) file.