I am using Lubuntu 16.04 LTS 32-bit. On my hard disk when I select any ISO file and right-click on it, the menu list has 'Disk Image Mounter'. Please tell me full details about it, what is it and how to use it.
Disk Image Mounter is a way to mount the contents of an ISO so they can be viewed. There are other ways to mount the ISO but without mounting it its contents are inaccessible.