How to Set Program Defaults in Windows Vista
When you want to use a specific program in Windows Vista to perform a particular function (for example, say that you want to use Firefox for browsing the Web), you just need to set that program as the default for that function. You can also use program defaults in Windows Vista to make a particular file type open in a specific program.
Then navigate to Control Panel→Programs.
2Click the Set Your Default Programs link.
You can find the Set Your Default Programs link in the Default Programs section.
Clicking Continue allow changes to be made.
4Select an item in the list of Programs.
You select the item by clicking once on it.
Clicking OK saves your settings.