I have done some research and it sounds like there isn't a formal standard for BOOTABLE DVDs, but that it usually works for most systems.Can someone please explain what it would take to create a ...

When the file has finished downloading, double-click on the Windows8-Setup.exe icon. This will start the Windows 8 Upgrade, which we will use to create a Windows 8 DVD.

Make an ISO from a CD-ROM Create a folder “boot” on the C drive. Insert one of the operating system’s installation CD into the DVD drive. Click the “Make CD/DVD image file from CD/DVD-ROM ...

How to Make a Bootable Mac ISO. When your small business creates a bootable disk for its Mac computers from ISO disk images, there's a difference between an ISO file and the disk image it contains.

By creating installation media using mechanisms such as making a USB memory for installation or downloading the ISO file to a bootable DVD, a secure clean installation can be achieved.

Create your own bootable Windows 10 ISO backup file using Windows free Media Creation Tool. Learn how now.

Also looking inside the memtest86-iso.iso file, I don't see anything I recognise as characteristic of bootable media e.g. it doesn't look like a linux bootable or a windows bootable..