That is a normal xhtml file, but I think some word processors might be confused by the first line of the code, which is:
Code:
<?xml version='1.0' encoding='UTF-8'?>
HTML and XHTML are a species of XML file, but it's weird for it to have this declaration rather than the <!DOCTYPE ...> first.
I don't have MS Word installed, but I was able to convert it to .doc format with
AbiWord without making any changes to the file at all. With
OpenOffice, I only had to delete this first line in a text editor before opening it, and then it worked fine. You could try deleting the first line and then opening them in Word and see if they work then. (Use a text editor like Notepad or Wordpad to delete the first line.)
For good measure, I attach the .doc file created by OpenOffice here.