I view Photoshop, Illustrator, PDF etc files within the Apple OS Finder. Whenever you select these file icons in 'column view' you are given a preview of what the content of the document looks like.
However, when I select an Indesign file icon all I see is a blown-up Indesign icon. Is there a preference somewhere that I have to select so that a preview is generated?
That's an expected behavior with InDesign file on Mac OS. You can say this is an OS related issue. It happens the same with us as well.