O sorry, I guess I should put instructions for those on my site. It's kinda like a zip file, but I think the .rars are a little better. You can install a free trial version. It's a share ware, so you never really have to buy it, but they keep asking you to.
Here is a link where you can download the program to extract it.
http://www.rarlab.com/rar/wrar37b5.exesorry, I'll add those instructions to my site now.
Ok, I just added that to the instructions page. Again, sorry I forgot to put those in there.