This script will create exr files from vrimg files rendered with Vray; they are saved as zips, and half float for best compatibility when working in Nuke.
The way it works is very simple, it takes the frame saved as vrimg format saved by vray, and right after it creates a exr saved as zips and half-float, by running the tool included with vray vrimg2exr.exe; This is done with a callback script post rendered frame, so if is a sequence of frames, they will all get converted as they finish rendering.