Axios Do you mean it should run a live ISO in a virtual environment or just mount the iso so you can check out the contents?
In the latter case with Budgie (and I assume GNOME) you can right-click an iso file, select "Open with..." and then choose the "Disk Image Mounter" to mount that iso. It will then be accessible like e.g. a mounted (USB-) drive
Not sure about other DEs