From the QSI Solutions website:
The Quantum Programmer unlocks the full potential of your QSI Decoders. Compatible with all Windows operating systems, it enables users to reflash their decoders to take advantage of firmware updates or new sound file releases. For free.
It also allows users to make CV registeries for their locomotives and quickly program all features in a snap using sliders, drop down menus and check boxes.
More Info on their website.