The cool thing about the Classic MacOS file type/creator system is that you what app opened a file was not dependent solely on the file type, but also on the ap

The cool thing about the Classic MacOS file type/creator system is that you what app opened a file was not dependent solely on the file type, but also on the app that created it. So if you downloaded a GIF file of a cute cat, it would open in your image viewer, but if you were working on drawing your own GIF image, it would open up in your image editor.