Opening windows files with Mac

Im presently on an imac with Snow Leopard installed on it. I found an old cdrom disk of mine that I burned a few years back when I had a Windows computer. I think it ran Windows XP Home. Anyways, I used a burning program called Hotburn to burn the disk. I burned my address book, several photos, different folders of various things onto the disk. For whatever reason, the file extensions on every file turned into .ink. So, how can I open them on my mac? I copied the files on the burned disk to a new folder on my imac.