I recently updated iTunes and QuickTime on my Windows 7 PC and afterwards noticed that when opening a .PSD (Photoshop Document) file that instead of opening in Photoshop the file opened in PictureViewer. I wasn’t even familiar with PictureViewer at first however after a little searching I realized that PictureViewer is now installed with QuickTime by default which is really annoying since I already have dozens of picture viewing applications. Anyhow what it meant was that I needed to modify how file types associated to applications which is what is described in more detail. I will first describe how to change a single file type to match a single application and then I will describe how to associate a single program to many file types at the same time.

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