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.

Right-click a file that you want to change the default app that opens, and select Get Info. In the Get Info window for the file, expand the Open With section by clicking the side arrow to bring up ...

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. Open the Finder and navigate to the file you ...

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.

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 ...

In the Open With section, if there’s an appropriate app in the list, you can select it and click Change All and confirm, and now all files with that extension open in that app. You can stop here.

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

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.