Then I wanted to create a UEFI bootable ISO image and it didn't work with any of combinations below (1) without emulation, 2) with hard disk emulation, 3) with floppy emulation): If I want to create a legacy-bootable ISO, everything works fine with the following settings: I checked all possible sources (Google, ImgBurn forums and FAQ) but actually did not find any precise instructions about which settings to use to create a UEFI (not legacy BIOS/MBR) compliant ISO. I needed to add my own software ( IGLib, IGShell and AnnApp based) to the ISO for testing and deployment. I needed to create an ISO as intermediate step in customizing a pre-compiled Win PE ISO image downloaded from this site. I tried to do the same with other software ( mkisofs) and everything worked, so that the original ISO should be OK. Contents of the original image were extracted by automatic mount to a Windows volume. I tried to create an ISO from extracted contents of the Windows 8.1 PE ISO image. I tried to boot the generated ISO file on a virtual machine (VirtualBox) and two computers (after transferring ISO to USB drive by Rufus). I was trying to create a UEFI-bootable ISO with ImgBurn, but the ISO can not be booted on UEFI based systems.

Imgburn bootable