Well, i think the best idea here,
is to implement something like this
--> http://forum.imgburn.com/index.php?showtopic=14179&view=getnewpost&hl=&fromsearch=1
So once your "unsupported image file" is Mounted to a Virtual Drive
You simply create an ISO image of it on your HDD
and then once created,
it would Automatically Switch to Write Mode
because you would have checkmark the box that says "Switch to Write Mode When Done"
and all is left to do is Choose a Write Speed
and Hit the START button,,,,
EnJOY""!!