31ec6655_OSX_UI_Philosophy___Ken_Snyder__OSX
[0] Document Icons [Windows & Linux] Icons and some previews: Most documents have a general icon. Icons are clickable in the entire square they reside (e.g. 32px by 32px). [OSX] 
Previews: Document previews are generated as much as possible. Icons are clickable only on the preview itself. (I was working with some icons for short and wide images and the icons were a bit difficult to select!)
OSX UI Philosophy - Ken Snyder
OSX