Displaying duplicate files

I've written a small desktop app that searches for duplicate files (by content) in one folder or more and lets the user open each file or delete it using a context menu.
The problem I face now is how to display the data to the user in an organized and structured way so he'll know his way around the files (could be hundreds or even more).
I was thinking about two ways:

• Data grid - It could've been nice if I was displaying only one file from each folder so each column would contain data regarding a single folder, however I couldn't think of a way to handle multiple files in the same folder
• Tree view - It seems to be more organized so that each group of duplicates would be represented in a node but I really dislike these long trees and also, since none of the files is the more important than the others I can't decide which one would be to node's root