Change your default apps
- Type Default apps into your Windows search box.
- Click Default apps in the search results.
- Scroll down until you see the heading Default apps, and then click Set defaults by app.
- Click Adobe Acrobat DC.
- Click Manage.
- Scroll down and locate the .pdf extension on the left-hand side, and then click Adobe Acrobat DC on the right-hand side.
- Click Adobe Acrobat DC.