"Preview" dock program

[bLaZ3n]

What does it do? When I click it nothing opens?

 

[GGJstudios]

What does it do? When I click it nothing opens?

You have to open a file with it, such as a picture or .pdf. Just double-click on a .jpg (unless you've associated those with iPhoto. Or double-click on a .pdf file.

Mac 101: Preview

 

[celticpride678]

You must open a file with it - such as a .jpg or .pdf