Unlock Mount And Blade How Do I Unlock Files On An .iso File?

How do I unlock files on an .iso file? - unlock mount and blade

I got this. To mount an ISO image file for a game, and tried with Daemon Tools Lite, but I've closed in the readme file, all files to create a free account somewhere. So I went to the site, but it moved and was no longer in use. Now I need to know how to open files.