I’ve done it. I’m sure you have, too.

We’ve all installed a program that arbitrarily grabbed certain file extensions (such as .doc, .jpg, .mp3) and changed Windows’ settings. Now, the new program is the default for opening that file type.

Sometimes, it’s our fault — many programs that can handle multiple file types will give us an option during the program’s installation. We’ll get the chance to select (or deselect) which program types will default to the new program. If we pick wrong, or decide later that this wasn’t really what we wanted to do, it seems like we’re stuck with the new program.

Fortunately, Windows has a couple easy ways for us to change the default program that is opened when you double-click on a file or an attachment.

For this example, let’s assume that we installed the graphics program Irfanview, which gives us the option to make it the default for a lot of different types of images. Without thinking, and forgetting that we really like Windows XP’s Windows Picture and Fax Viewer, we set IrfanView to be the default for JPG images.

Continue reading HOWTO: Change File-type Program Associations