As they are both inherently different formats, a conversion is not possible, as a .rar file is a compressed archive, while a .dmg is more of mountable image of a CD/DVD or any other medium.
You can use UnrarX or The Unarchiver to simply extract .rar files, just make sure you get the right version for your Mac OS X version.
As they are both inherently different formats, a conversion is not possible, as a .rar file is a compressed archive, while a .dmg is more of mountable image of a CD/DVD or any other medium.
You can use UnrarX or The Unarchiver to simply extract .rar files, just make sure you get the right version for your Mac OS X version.