If you can't change default app by file type in Windows 11/10, then reset the problematic app, remove file type association, etc.

Do you want to open a file type or link with a specific app? Here's how to change the default app settings on Windows 11.

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.

Windows 11 can make it easier to access your extensions through apps. Here's how. Windows 11 can keep track of the apps you open and set them by default for faster navigation.

Whatever it is, that's the default app for PDFs. Other file types, from JPEGs to MP3s, will have their own default apps associated with them. [Related: 12 hidden Android features you should be using] ...

Now that you’ve changed the default program for this file, the button for Change All is active. This button will set your Mac to use the selected application to open files of this type.