How to Change default photo program that opens yahoo mail photos?

I have multiple photo editing programs on my computer. I would like to make the Microsoft Picture and Fax viewer my default opener for the photos, how do I do this?How to Change default photo program that opens yahoo mail photos?
right click on any jpg already in your puter

select open with...scroll to the option ';Microsoft Picture';

Make sure you put a check in the box ';Always open with'; click okay and your good... but you might have to do the same for .gif and png files....