Not 100% helpful for you, I admit - but I've certainly had region free DVD player software on my laptop - just not sure it was 100% free.
I'll hunt out the name if you wish - though it was something from the Department of the Bleeding Obvious and was "RegionFreeDVD" or similar.
I know it's not what you asked - but I would be tempted to try and burn the DVD into a Region 0 DVD. Copy it, rather than jump through such hoops of finding a player for it.