so my next question would be - what is the behavior of E2B with UEFI? for example, if I want to boot Win8.1 64-bit(which is the 4+ gb file), I insert the USB drive(which has imgPTN files for every version of windows I want), and it boots to Clover? Or do I actually need a third party machine with CSM enabled? Because this is intended for convenience.
So I don't want to have to enable CSM on every machine I wish to install Windows onto. I'd rather have the ability to load up on any machine, and select any version of Windows.
I had a little trouble getting me head around how it works too.
Like Steve said make a NTFS Easy2Boot USB stick. Then convert the ISOs to .imgPTN files as FAT32 images. Since the stick is NTFS it can hold files greater than 4GB.
What happens is that Easy2Boot loads up, you select which imgPTN file you want to boot to and E2B does some slight of hand and makes the .imgPTN bootable from the stick . Since the partition IMAGE is formatted FAT32 that means it can be used to boot UEFI. There is no issue with it being greater than 4GB as it's the partition IMAGE file that exceeds 4GB and it's formatted FAT 32.
After I select which imgPTN file I want to boot to by selecting it in E2B (and letting E2B do it's magic) I typically reboot the PC with the stick, the "drive" (which is actually the imgPTN file) is booted. As long as the UEFI files are there in the correct folder it will boot via UEFI (UEFI boot must be ON in the BIOS and secure boot OFF). Be sure to trip the PCs BIOS boot menu, usually by hitting a key as the PC starts, for a lot of PCs it's the F12 key. If you select to boot to the E2B stick via UEFI it boots straight through. You can also boot via UEFI using Clover but I've found this problematic at times.
After you are done with the Windows install then boot to the stick, only this time select to boot to it via MBR mode. When you boot the stick via MBR and the imgPTN was set t boot a special E2B menu appears and one of the selections is to restore the E2B menu back to the normal E2B menu structure.
I have 6 different imgPTN files that I can install from. Both 32 and 64 bit installs of Win 7, Win 8.1 and Win 10. Of course the 32 bit versions will not boot via UEFI on a 64 bit CPU. I also have a few ISOs with Windows PE and various Linux distros and utilities on the same stick. It works like a charm and all fits in my pocket.