Now thats suprising, the files *do* open fine in notepad on XP. But I'm more surprised that notepad had been updated.
I saved one out with notepad and then checked with the editor I was using to see what it had changed. The Byte order for Unicode as saved by Notepad is low-high, same as the intel procs. It saves as UCS-2, and the only difference, and what may have been causing the problem, is the byte order mark at the beginning of the file. The first editor gave me the option of putting that in, but I hadn't, notepad does it by default (with no option not to) and that seemed to be what Word was expecting. In other words the only thing different was that mark, and it made the difference.
Thanks for the Notepad tip Dan.