An .ISO image is a well, form of image file. :3
If you want to change it to a .img/.dmg (Which are, essentially, the same file) you can use this Terminal command:
hdiutil convert -format UDRW -o /path/to/target.img /path/to/original.iso
OSX tends to chuck a .dmg on the end after conversion, just get rid of it if you don't want it. Apple's Bootcamp FAQ should help you using bootcamp, but I'm not sure if OSX 10 has bootcamp. You can always try searching for it.
Tell us what happens!