Right-click on a Registry key for which you can’t change the default app by file type and use the Delete option to remove it. If you can’t delete the key, then first take full control ...

On Windows 11, you can set any app as the default for a specific file type or link, and in this guide, you will learn how including the steps to reset the settings to the original configuration.

Add or remove Default Apps from Desktop context menu A default app is the program that Windows uses automatically when you open a particular file type or protocol on your device.

If you choose an app there, it will only work for the file you’ve selected and not for subsequent files of the same type (in this case, PDF).

Windows makes it easy for you to open up these files by setting up default programs for each file type -- images files, for example, will open by default in the Windows 10 Photos app.

Click the app to the right of the file type that you want to change and you can choose a different program from the apps installed on your PC. The process is similar for Mac users.