In the app, follow the steps below. If you don't have it, visit the Microsoft App Store.
When you first open the Snapfish app you will be prompted to use this app as the default photo viewer on your PC.
If you do not see this, you can also follow these steps:
Using your file browser on your PC...
- Right click on a specific photo.
- Select "open with" and select "Choose default program…"
- Select the Snapfish App.