In this guide, AppleInsider shows you how to permanently change the apps used for common tasks as well as which apps are used to open certain file types.

Click Open. If the app that you want to use to open the file type is greyed out, it's because macOS doesn't think there's a valid association between the two.

How to temporarily launch a file in a different app This is very easy and it won’t change the way your Mac treats files of that type in the future.

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.

If you want a different app to always open a particular file type, here's how to do it.

Mac OS X computers use a default application to open every file type based on its file extension. If you don't want to use the default application when opening a file, you can select "Open With ...

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

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.

Need to use third-party programs to open files on your PC? Here's how to change file associations in Windows 10 and choose which apps open which file types.