Windows Right-click on a PSD file on your desktop and select "Open With" from the context menu. Select "Choose Default Program" from the submenu that opens.

If Paint.NET is your editor of choice and you find yourself needing to open .PSD Photoshop files, this plugin will help you introduce .PSD images into ...

How to change the default program a file opens with in Windows 7 When you open files that have a particular file extension, Windows will look at its configuration to determine what the default ...