Years ago Finder on Mac added a really nifty little feature where the icon thumbnail for audio and video files offers a teensy tiny player right in the icon. While technically really cool, I think I'd file this feature under "we did it because we can". All too often, I see people trying to click a file intending to select it, but instead, it starts playing. Fortunately, this feature can be disabled. Though it involves using Terminal, so be careful.
To get rid of this itsy bitsy player, open the Terminal app (if you don't know where to find that or what I'm talking about then you probably shouldn't be there) and enter the following command.
defaults write com.apple.finder QLInlinePreviewMinimumSupportedSize -int 50000
Once you restart your Mac, the media controls will only be active if the icon is more than 5000 pixels wide, which it probably never will be.
