Default apps can be set for programs in windows PC. It allows apps to run with assigned programs. By default in windows PC comes windows apps.
Set Default apps for program in windows 10/8/7
To open Default apps, go to Start Menu and click on it, go to Settings by clicking on it. There you will find first tab SYSTEM (Display, notifications, apps, power), click on it. Now click on Default apps.
Here you can choose for default apps.
Next is Reset. If you press Reset then all your apps will revert back to windows recommended apps.
Further, you can choose apps by their file type. You can choose Default apps by the protocol. Set as defaults by the app, you can set a program as the default for all file type and protocol. Click on that program and set as default.
You may like How to use Offline Maps in Windows 10/8/7.