Does it support IMG files?

[vmclark]

BTW, what distributions only support img format (without ISO file)?

I think we will start to see a lot of bootable images to move away from providing ISO very soon, since USB is becoming the norm and a bunch of new PCs not even including CD/DVD drives.

Example:
Recent versions of memtest86 (they still have a ISO, but its "not supported")

Moving from ISO to what IMG? I don't think so. We need bootable live support.