Windows 8 - How to Set or Change File Associations?

You may want open, let's say your .jpeg pictures with Windows Viever or Picasa by default ?

Then change your file Association.
To set File Associations in Windows 8:

 > Open Control Panel
 > Programs
 > Default Programs
 >  Click on Make your File Type always open in a specific program

Find and click on file extension your are interested in and click on Change program

Select the application you want to use by default to open your .jpeg

You're done !