Opening a file from a stack in a specific application!
Stacks are not quite like a Finder window, because it is not possible to right-click on a file and choose an application to open it in. There is still a way to force the Finder to open a file from a Stack in a specific application without even loading the stack folder in a Finder window. It works really well when the application you want to open it with is in your Dock. The way it is done is by simply dragging the file from the stack to the app. If the application is not one that is recommended by the Finder, the icon won't become highlighted, but you can still load it in this app by holding down "Option - Command" when dragging the file.