Hi Pete,
I've had a bit more luck than you.
I unzipped it and moved openoffice 4 to the root of my test drive. Going on past experience renamed it to openoffice-4 then created a program object for soffice.exe, double clicked on it and it started with no apparent problem, even if it was rather slow.
It opened an .odt document that I have been working on - using libreoffice 4 for windows in virtualbox - it even allowed me to edit and save it.
When I closed it, it threw a fault in doscall1 for some reason which I will try and track down when I have more time to play with it.