I have a file that I don't know how to open. It's 2GB and from what I remember it was either a .zip or .dmg file. However some time ago when I made it I also removed the last 3 characters from the name and renamed it .mov. This changed the way that finder dealt with it. Now I would like to open it but when I change the suffix to either of the above they aren't recognised making me wonder if either the file is corrupt or maybe it's not a zip or dmg. How can I tell what the file is? I've gone into terminal and queried it with the "file" command but it just tells me that it's data. Any ideas?